diff --git a/README.md b/README.md
index 37ccf7d..4df590d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # @kaminooni/env
 
-Easy yet type-safe access to process.env variables.
+Simple, declarative, and type-safe access to process.env variables.
 
 ## Usage
 
@@ -12,154 +12,78 @@ enum Environment {
   Development = 'development'
 }
 
-const ENVIRONMENT: Environment = env('NODE_ENV')
-  .required()
-  .enum(Environment)
-
-const DEBUG = env('DEBUG')
-  .default(false)
-  .boolean()
-
-const APP_NAME = env('APP_NAME')
-  .default('My App')
-  .trim()
-  .string()
-
-const APP_SECRET = env('APP_SECRET')
-  .required()
-  .string()
-
-const SERVER_PORT = env('SERVER_PORT')
-  .default(3000)
-  .range(0, 65536)
-
-const API_VERSION = env('API_VERSION')
-  .permit(['v1', 'v2', 'v3'])
-  .default('v3')
-  .string()
+const config = {
+  environment: env('NODE_ENV').enum(Environment),
+  debug: env('DEBUG', false).boolean(),
+  port: env('PORT', 3000).range(0, 65536),
+  app: {
+    name: env('APP_NAME', 'My App').string(),
+    secret: env('APP_SECRET').string(),
+    apiVersion: env('API_VERSION', 'v3').whitelist(['v1', 'v2', 'v3']),
+    emails: env('EMAILS', ['myemail@example.com']).json<string[]>(),
+    retries: env('RETRIES', 5).number(),
+  },
+}
 ```
 
 ## env(...) function
 
-> env(key: string) => EnvVariableBuilder
-
-This function takes Env variable name, reads this variable from `process.env` and returns the instance
-of `EnvVariableBuilder`
+> env(key: string, defaultValue?: string) => VariableBuilder
 
-## Builder (EnvVariableBuilder)
+This function takes Env variable name, reads this variable from `process.env` and returns the instance of `VariableBuilder`
 
-Builder helps you to validate, transform, set default, and cast the env variables to a type of your choice.
-
-### permit(values: string[])
-
-Verifies that value is one of the list.
-
-- This function does nothing if env value is `undefined`
-
-```ts
-const API_VERSION = env('API_VERSION')
-  .permit(['v1', 'v2', 'v3'])
-  .string()
-```
-
-### range(from: number, to: number)
-
-Verifies that value is a number in the specified range.
-
-- Returns number
-- Both limits are inclusive
-
-```ts
-const SERVER_PORT = env('SERVER_PORT')
-  .default(3000)
-  .range(0, 65536)
-```
-
-### required()
-
-Verifies that value is not undefined.
-Throws `MissingRequiredVariableError` if env value is `undefined`
-
-```ts
-const APP_SECRET = env('APP_SECRET')
-  .required()
-  .string()
-```
+## VariableBuilder
 
-### default(value: string | number | boolean)
-
-Sets the default value if env value is `undefined`
-
-```ts
-const DEBUG = env('DEBUG')
-  .default(false)
-  .boolean()
-```
-
-### trim()
-
-Trims the env value
-
-- This function does nothing if env value is `undefined`
-
-```ts
-const APP_NAME = env('APP_NAME')
-  .trim()
-  .string()
-```
+VariableBuilder helps you to validate, transform, and cast the env variables to a type of your choice.
+All values are considered required, unless the default value is provided. If you try to access the non-existent variable, the builder will throw an error.
 
 ### string() / toString()
 
 Converts env variable to `string`
 
-- `undefined` value will be converted to empty string `''`
-
 ```ts
-const APP_NAME = env('APP_NAME')
-  .string()
+env('APP_NAME').string()
 ```
 
 ### boolean()
 
 Converts env variable to `boolean`
-
-- Case-insensitive
-- By default, returns `true` if env value equals `'true'`. Returns `false` otherwise.
+Returns `true` if env value equals `'true'` (case-insensitive). Returns `false` otherwise.
 
 ```ts
-const DEBUG = env('DEBUG').boolean()
+env('DEBUG').boolean()
 ```
 
-#### How to change the default list of allowed true values
+### number()
 
-List of allowed "true" values could be changed by updating the `EnvVariableBuilder.allowedTrueValues` variable
+Converts env variable to `number`.
+> NOTE: Empty string `''` will be converted to `0`.
 
 ```ts
-import { EnvVariableBuilder } from '@kaminooni/env'
+env('MAX_CONNECTIONS').number()
+```
 
-EnvVariableBuilder.allowedTrueValues = ['1']
+### whitelist(values: string[])
 
-process.env['DEBUG'] = 1
+Verifies that value is in the white list. Throws an `Error` if it's not.
 
-const DEBUG = env('DEBUG').boolean() // Returns true
+```ts
+env('API_VERSION').whitelist(['v1', 'v2', 'v3'])
 ```
 
-### number()
-
-Converts env variable to `number`
+### range(from: number, to: number)
 
-- `undefined` value will be converted to `NaN`
-- Empty string `''` will be converted to `0`
+Verifies that value is a number in the specified range. Both limits are inclusive. 
+Throws an `Error` if value is not in the specified range.
 
 ```ts
-const MAX_CONNECTIONS = env('MAX_CONNECTIONS').number()
+env('SERVER_PORT', 3000).range(0, 65536)
 ```
 
 ### enum()
 
-Converts variable to `enum`
-
-- Throws `UnexpectedValueError` if the value exists, and it is not member of provided Enum
+Converts variable to the member of specified `enum`.
+Throws an `Error` if the value is not a member of the provided Enum.
 
 ```ts
 enum Environment {
@@ -167,7 +91,14 @@ enum Environment {
   Development = 'development'
 }
 
-const ENVIRONMENT: Environment = env('NODE_ENV')
-  .required()
-  .enum(Environment)
+const ENVIRONMENT: Environment = env('NODE_ENV').enum(Environment)
+```
+
+### json()
+Converts env variable to JS object using JSON.parse() function
+
+> NOTE: This functions doesn't check that JSON comply with the specified type.
+
+```ts
+const emails: string[] = env('EMAILS', ['myemail@example.com']).json<string[]>()
 ```
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 9f81f2c..bc85f72 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
-  "name": "env",
-  "version": "1.0.2",
+  "name": "@kaminooni/env",
+  "version": "2.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "env",
-      "version": "1.0.2",
+      "name": "@kaminooni/env",
+      "version": "2.0.0",
       "license": "MIT",
       "devDependencies": {
         "@types/jest": "^29.2.0",
@@ -39,17 +39,89 @@
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.18.6",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.18.6.tgz",
-      "integrity": "sha512-TDCmlK5eOvH+eH7cdAFlNXeVJqWIQ7gW9tY1GJIpUtFb6CmjVyq2VM3u71bOyR8CRihcCgMUYoDNyLXao3+70Q==",
+      "version": "7.23.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.23.5.tgz",
+      "integrity": "sha512-CgH3s1a96LipHCmSUmYFPwY7MNx8C3avkq7i4Wl3cfa662ldtUe4VM1TPXX70pfmrlWTb6jLqTYrZyT2ZTJBgA==",
       "dev": true,
       "dependencies": {
-        "@babel/highlight": "^7.18.6"
+        "@babel/highlight": "^7.23.4",
+        "chalk": "^2.4.2"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/code-frame/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/code-frame/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/code-frame/node_modules/color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "1.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame/node_modules/color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
+      "dev": true
+    },
+    "node_modules/@babel/code-frame/node_modules/escape-string-regexp": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/@babel/code-frame/node_modules/has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/code-frame/node_modules/supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/@babel/compat-data": {
       "version": "7.20.0",
       "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.20.0.tgz",
@@ -90,22 +162,23 @@
       }
     },
     "node_modules/@babel/core/node_modules/semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true,
       "bin": {
         "semver": "bin/semver.js"
       }
     },
     "node_modules/@babel/generator": {
-      "version": "7.20.0",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.20.0.tgz",
-      "integrity": "sha512-GUPcXxWibClgmYJuIwC2Bc2Lg+8b9VjaJ+HlNdACEVt+Wlr1eoU1OPZjZRm7Hzl0gaTsUZNQfeihvZJhG7oc3w==",
+      "version": "7.23.6",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.23.6.tgz",
+      "integrity": "sha512-qrSfCYxYQB5owCmGLbl8XRpX1ytXlpueOb0N0UmQwA073KZxejgQTzAmJezxvpwQD9uGtK2shHdi55QT+MbjIw==",
       "dev": true,
       "dependencies": {
-        "@babel/types": "^7.20.0",
+        "@babel/types": "^7.23.6",
         "@jridgewell/gen-mapping": "^0.3.2",
+        "@jridgewell/trace-mapping": "^0.3.17",
         "jsesc": "^2.5.1"
       },
       "engines": {
@@ -145,43 +218,43 @@
       }
     },
     "node_modules/@babel/helper-compilation-targets/node_modules/semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true,
       "bin": {
         "semver": "bin/semver.js"
       }
     },
     "node_modules/@babel/helper-environment-visitor": {
-      "version": "7.18.9",
-      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.18.9.tgz",
-      "integrity": "sha512-3r/aACDJ3fhQ/EVgFy0hpj8oHyHpQc+LPtJoY9SzTThAsStm4Ptegq92vqKoE3vD706ZVFWITnMnxucw+S9Ipg==",
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.22.20.tgz",
+      "integrity": "sha512-zfedSIzFhat/gFhWfHtgWvlec0nqB9YEIVrpuwjruLlXfUSnA8cJB0miHKwqDnQ7d32aKo2xt88/xZptwxbfhA==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-function-name": {
-      "version": "7.19.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.19.0.tgz",
-      "integrity": "sha512-WAwHBINyrpqywkUH0nTnNgI5ina5TFn85HKS0pbPDfxFfhyR/aNQEn4hGi1P1JyT//I0t4OgXUlofzWILRvS5w==",
+      "version": "7.23.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.23.0.tgz",
+      "integrity": "sha512-OErEqsrxjZTJciZ4Oo+eoZqeW9UIiOcuYKRJA4ZAgV9myA+pOXhhmpfNCKjEH/auVfEYVFJ6y1Tc4r0eIApqiw==",
       "dev": true,
       "dependencies": {
-        "@babel/template": "^7.18.10",
-        "@babel/types": "^7.19.0"
+        "@babel/template": "^7.22.15",
+        "@babel/types": "^7.23.0"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-hoist-variables": {
-      "version": "7.18.6",
-      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.18.6.tgz",
-      "integrity": "sha512-UlJQPkFqFULIcyW5sbzgbkxn2FKRgwWiRexcuaR8RNJRy8+LLveqPjwZV/bwrLZCN0eUHD/x8D0heK1ozuoo6Q==",
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.22.5.tgz",
+      "integrity": "sha512-wGjk9QZVzvknA6yKIUURb8zY3grXCcOZt+/7Wcy8O2uctxhplmUPkOdlgoNhmdVee2c92JXbf1xpMtVNbfoxRw==",
       "dev": true,
       "dependencies": {
-        "@babel/types": "^7.18.6"
+        "@babel/types": "^7.22.5"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -240,30 +313,30 @@
       }
     },
     "node_modules/@babel/helper-split-export-declaration": {
-      "version": "7.18.6",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.18.6.tgz",
-      "integrity": "sha512-bde1etTx6ZyTmobl9LLMMQsaizFVZrquTEHOqKeQESMKo4PlObf+8+JA25ZsIpZhT/WEd39+vOdLXAFG/nELpA==",
+      "version": "7.22.6",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.22.6.tgz",
+      "integrity": "sha512-AsUnxuLhRYsisFiaJwvp1QF+I3KjD5FOxut14q/GzovUe6orHLesW2C7d754kRm53h5gqrz6sFl6sxc4BVtE/g==",
       "dev": true,
       "dependencies": {
-        "@babel/types": "^7.18.6"
+        "@babel/types": "^7.22.5"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-string-parser": {
-      "version": "7.19.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.19.4.tgz",
-      "integrity": "sha512-nHtDoQcuqFmwYNYPz3Rah5ph2p8PFeFCsZk9A/48dPc/rGocJ5J3hAAZ7pb76VWX3fZKu+uEr/FhH5jLx7umrw==",
+      "version": "7.23.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.23.4.tgz",
+      "integrity": "sha512-803gmbQdqwdf4olxrX4AJyFBV/RTr3rSmOj0rKwesmzlfhYNDEs+/iOcznzpNWlJlIlTJC2QfPFcHB6DlzdVLQ==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.19.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.19.1.tgz",
-      "integrity": "sha512-awrNfaMtnHUr653GgGEs++LlAvW6w+DcPrOliSMXWCKo597CwL5Acf/wWdNkf/tfEQE3mjkeD1YOVZOUV/od1w==",
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
+      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
@@ -293,13 +366,13 @@
       }
     },
     "node_modules/@babel/highlight": {
-      "version": "7.18.6",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.18.6.tgz",
-      "integrity": "sha512-u7stbOuYjaPezCuLj29hNW1v64M2Md2qupEKP1fHc7WdOA3DgLh37suiSrZYY7haUB7iBeQZ9P1uiRF359do3g==",
+      "version": "7.23.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.23.4.tgz",
+      "integrity": "sha512-acGdbYSfp2WheJoJm/EBBBLh/ID8KDc64ISZ9DYtBmC8/Q204PZJLHyzeB5qMzJ5trcOkybd78M4x2KWsUq++A==",
       "dev": true,
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.18.6",
-        "chalk": "^2.0.0",
+        "@babel/helper-validator-identifier": "^7.22.20",
+        "chalk": "^2.4.2",
         "js-tokens": "^4.0.0"
       },
       "engines": {
@@ -378,9 +451,9 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.20.0",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.20.0.tgz",
-      "integrity": "sha512-G9VgAhEaICnz8iiJeGJQyVl6J2nTjbW0xeisva0PK6XcKsga7BIaqm4ZF8Rg1Wbaqmy6znspNqhPaPkyukujzg==",
+      "version": "7.23.6",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.23.6.tgz",
+      "integrity": "sha512-Z2uID7YJ7oNvAI20O9X0bblw7Qqs8Q2hFy0R9tAfnfLkp5MW0UH9eUvnDSnFwKZ0AvgS1ucqR4KzvVHgnke1VQ==",
       "dev": true,
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -567,34 +640,34 @@
       }
     },
     "node_modules/@babel/template": {
-      "version": "7.18.10",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.18.10.tgz",
-      "integrity": "sha512-TI+rCtooWHr3QJ27kJxfjutghu44DLnasDMwpDqCXVTal9RLp3RSYNh4NdBrRP2cQAoG9A8juOQl6P6oZG4JxA==",
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+        "@babel/types": "^7.22.15"
       }
     },
     "@babel/traverse": {
-      "version": "7.20.0",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.20.0.tgz",
-      "integrity": "sha512-5+cAXQNARgjRUK0JWu2UBwja4JLSO/rBMPJzpsKb+oBF5xlUuCfljQepS4XypBQoiigL0VQjTZy6WiONtUdScQ==",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "^7.18.6",
-        "@babel/generator": "^7.20.0",
-        "@babel/helper-environment-visitor": "^7.18.9",
-        "@babel/helper-function-name": "^7.19.0",
-        "@babel/helper-hoist-variables": "^7.18.6",
-        "@babel/helper-split-export-declaration": "^7.18.6",
-        "@babel/parser": "^7.20.0",
-        "@babel/types": "^7.20.0",
-        "debug": "^4.1.0",
+      "version": "7.23.6",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.23.6.tgz",
+      "integrity": "sha512-czastdK1e8YByZqezMPFiZ8ahwVMh/ESl9vPgvgdB9AmFMGP5jfpFax74AQgl5zj4XHzqeYAg2l8PuUeRS1MgQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.23.5",
+        "@babel/generator": "^7.23.6",
+        "@babel/helper-environment-visitor": "^7.22.20",
+        "@babel/helper-function-name": "^7.23.0",
+        "@babel/helper-hoist-variables": "^7.22.5",
+        "@babel/helper-split-export-declaration": "^7.22.6",
+        "@babel/parser": "^7.23.6",
+        "@babel/types": "^7.23.6",
+        "debug": "^4.3.1",
         "globals": "^11.1.0"
       },
       "dependencies": {
@@ -5186,13 +5319,13 @@
       }
     },
     "@babel/types": {
-      "version": "7.20.0",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.20.0.tgz",
-      "integrity": "sha512-Jlgt3H0TajCW164wkTOTzHkZb075tMQMULzrLUoUeKmO7eFL96GgDxf7/Axhc5CAuKE3KFyVW1p6ysKsi2oXAg==",
+      "version": "7.23.6",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.6.tgz",
+      "integrity": "sha512-+uarb83brBzPKN38NX1MkB6vb6+mwvR6amUulqAE7ccQw1pEl+bCia9TbdG1lsnFP7lZySvUn37CHyXQdfTwzg==",
       "dev": true,
       "requires": {
-        "@babel/helper-string-parser": "^7.19.4",
-        "@babel/helper-validator-identifier": "^7.19.1",
+        "@babel/helper-string-parser": "^7.23.4",
+        "@babel/helper-validator-identifier": "^7.22.20",
         "to-fast-properties": "^2.0.0"
       }
     },
@@ -6857,9 +6990,9 @@
       },
       "dependencies": {
         "semver": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "version": "6.3.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+          "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
           "dev": true
         }
       }
@@ -7444,9 +7577,9 @@
       },
       "dependencies": {
         "semver": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "version": "6.3.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+          "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
           "dev": true
         }
       }
@@ -7860,9 +7993,9 @@
       }
     },
     "semver": {
-      "version": "7.3.8",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
-      "integrity": "sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==",
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
       "dev": true,
       "requires": {
         "lru-cache": "^6.0.0"
@@ -8148,9 +8281,9 @@
       }
     },
     "word-wrap": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
-      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
       "dev": true
     },
     "wrap-ansi": {
diff --git a/package.json b/package.json
index 26928b6..bdb2596 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@kaminooni/env",
   "description": "Type-save env variables access",
-  "version": "1.0.2",
+  "version": "2.0.0",
   "author": {
     "name": "kaminooni",
     "url": "https://github.com/kaminooni"
diff --git a/src/EnvVariableBuilder.ts b/src/EnvVariableBuilder.ts
deleted file mode 100644
index 0eb74c1..0000000
--- a/src/EnvVariableBuilder.ts
+++ /dev/null
@@ -1,126 +0,0 @@
-import { MissingRequiredVariableError, UnexpectedValueError } from './errors'
-
-export class EnvVariableBuilder {
-  public static allowedTrueValues = ['true']
-
-  private value?: string
-  private readonly key: string
-
-  constructor(key: string, value?: string) {
-    this.key = key
-    this.value = value
-  }
-
-  /**
-   * Verifies that value is not undefined
-   *
-   * @throws {MissingRequiredVariableError} if value is undefined
-   */
-  required(): EnvVariableBuilder {
-    if (this.value === undefined) {
-      throw new MissingRequiredVariableError(this.key)
-    }
-
-    return this
-  }
-
-  /**
-   * Verifies that value is one of the list.
-   * - Ignores undefiled values
-   *
-   * @param values
-   * @throws {UnexpectedValueError} if the value exists, and it is not included in the provided list
-   */
-  permit(values: string[]): EnvVariableBuilder {
-    if (this.value !== undefined && !values.includes(this.value)) {
-      throw new UnexpectedValueError(this.key, this.value)
-    }
-
-    return this
-  }
-
-  /**
-   * Sets the default value if the value is `undefined`
-   *
-   * @param value
-   */
-  default(value: string | number | boolean): EnvVariableBuilder {
-    this.value ??= value.toString()
-
-    return this
-  }
-
-  /**
-   * Trims the value
-   * - Ignores undefiled values
-   */
-  trim(): EnvVariableBuilder {
-    if (this.value !== undefined) {
-      this.value = this.value.trim()
-    }
-
-    return this
-  }
-
-  /**
-   * Converts env variable to `string`
-   * - `undefined` value will be converted to empty string `''`
-   */
-  string(): string {
-    return this.value ?? ''
-  }
-
-  /**
-   * Converts env variable to `boolean`
-   */
-  boolean(): boolean {
-    return EnvVariableBuilder.allowedTrueValues.includes(
-      this.string().toLowerCase()
-    )
-  }
-
-  /**
-   * Converts env variable to `number`
-   */
-  number(): number {
-    return Number(this.value)
-  }
-
-  /**
-   * Converts variable to enum
-   *
-   * @param enumerable
-   * @throws {UnexpectedValueError} if the value exists, and it is not member of provided Enum
-   */
-  enum<T extends Record<string | number, string | number>>(
-    enumerable: T
-  ): T[keyof T] {
-    const allowedValues = Object.values(enumerable).map((value) =>
-      value.toString()
-    )
-
-    return this.permit(allowedValues).string() as T[keyof T]
-  }
-
-  /**
-   * Verifies that value is a number in the specified range
-   * - Both limits are inclusive
-   *
-   * @param from Lower limit (inclusive)
-   * @param to Upper limit (inclusive)
-   * @throws {UnexpectedValueError} if the value exists and is outside the specified range
-   */
-  range(from: number, to: number): number {
-    const value = this.number()
-
-    if (value > to || value < from) {
-      throw new UnexpectedValueError(this.key, this.value)
-    }
-
-    return value
-  }
-
-  toString(): string {
-    return this.string()
-  }
-}
diff --git a/src/VariableBuilder.ts b/src/VariableBuilder.ts
new file mode 100644
index 0000000..75b67de
--- /dev/null
+++ b/src/VariableBuilder.ts
@@ -0,0 +1,106 @@
+export class VariableBuilder {
+  constructor(
+    private readonly name: string,
+    private readonly value?: string
+  ) {
+  }
+
+  /**
+   * Verifies that value is one of the list.
+   *
+   * @param values
+   * @throws {Error} if the value is not included in the provided list
+   */
+  whitelist(values: string[]): string {
+    const value = this.string()
+
+    if (!values.includes(value)) {
+      throw new Error(
+        `Unexpected value of the env variable: "${this.name}". Value is not in the white list.`
+      );
+    }
+
+    return value;
+  }
+
+  /**
+   * Converts env variable to `string`
+   *
+   * @throws {Error} if value is undefined
+   */
+  string(): string {
+    if (this.value === undefined) {
+      throw new Error(`Missing required env variable: "${this.name}"`);
+    }
+
+    return this.value;
+  }
+
+  /**
+   * Converts env variable to `boolean`
+   *
+   * @throws {Error} if value is undefined
+   * @return {boolean} Returns `true` if env value equals `'true'` (case-insensitive). Returns `false` otherwise.
+   */
+  boolean(): boolean {
+    return this.string().toLowerCase().trim() === "true";
+  }
+
+  /**
+   * Converts env variable to `number`
+   *
+   * @throws {Error} if value is undefined
+   */
+  number(): number {
+    return Number(this.string());
+  }
+
+  /**
+   * Converts env variable to JS object using JSON.parse function
+   *
+   * @throws {Error} if value is undefined
+   */
+  json<T>(): T {
+    return JSON.parse(this.string())
+  }
+
+  /**
+   * Converts variable to enum
+   *
+   * @param enumerable
+   * @throws {Error} if the value is undefined or not a member of the provided Enum
+   */
+  enum<T extends Record<string | number, string | number>>(
+    enumerable: T
+  ): T[keyof T] {
+    const allowedValues = Object.values(enumerable).map((value) =>
+      value.toString()
+    );
+
+    return this.whitelist(allowedValues) as T[keyof T];
+  }
+
+  /**
+   * Verifies that value is a number in the specified range
+   * - Both limits are inclusive
+   *
+   * @param from Lower limit (inclusive)
+   * @param to Upper limit (inclusive)
+   * @throws {Error} if the value is undefined or outside the specified range
+   */
+  range(from: number, to: number): number {
+    const value = this.number();
+
+    if (value > to || value < from) {
+      throw new Error(
+        `Unexpected value of the env variable "${this.name}". Value is not in range: [${from},${to}]`
+      );
+    }
+
+    return value;
+  }
+
+  toString(): string {
+    return this.string();
+  }
+}
diff --git a/src/__tests__/EnvVariableBuilder.test.ts b/src/__tests__/EnvVariableBuilder.test.ts
deleted file mode 100644
index 6bfd7e8..0000000
--- a/src/__tests__/EnvVariableBuilder.test.ts
+++ /dev/null
@@ -1,200 +0,0 @@
-import { EnvVariableBuilder } from '../EnvVariableBuilder'
-import { MissingRequiredVariableError, UnexpectedValueError } from '../errors'
-
-describe('EnvVariableBuilder', () => {
-  enum TestStringEnum {
-    ENUM_VALUE = 'e_value',
-  }
-
-  enum TestNumericEnum {
-    ENUM_VALUE_1,
-    ENUM_VALUE_2,
-    ENUM_VALUE_5 = 5,
-  }
-
-  it('should read value from environment', () => {
-    const builder = new EnvVariableBuilder('TEST_KEY', 'TEST_VALUE')
-
-    expect(builder.string()).toEqual('TEST_VALUE')
-  })
-
-  it.each([
-    ['S1', 'Some String Value', 'Some String Value'],
-    ['S2', '123', '123'],
-    ['S3', '', ''],
-    ['S4', undefined, ''],
-  ])(
-    '%s should correctly read string value `%s` == `%s`',
-    (key: string, value: string | undefined, result: string) => {
-      const builder = new EnvVariableBuilder(key, value)
-
-      expect(builder.string()).toEqual(result)
-      expect(builder.toString()).toEqual(result)
-    }
-  )
-
-  it.each([
-    ['B1', 'true', true],
-    ['B2', 'false', false],
-    ['B3', 'some random string', false],
-    ['B4', '123', false],
-    ['B5', '1', false],
-    ['B6', '0', false],
-    ['B7', '', false],
-  ])(
-    '%s should correctly read boolean value `%s` == `%s`',
-    (key: string, value: string, result: boolean) => {
-      const builder = new EnvVariableBuilder(key, value)
-
-      expect(builder.boolean()).toEqual(result)
-    }
-  )
-
-  it.each([
-    ['N1', '123', 123],
-    ['N2', '-123', -123],
-    ['N3', '0.23', 0.23],
-    ['N4', '2.99', 2.99],
-    ['N5', '.65', 0.65],
-    ['N6', '', 0],
-    ['N7', 'some random string', NaN],
-    ['N8', '1a2', NaN],
-    ['N9', 'a1', NaN],
-    ['N10', '1a', NaN],
-  ])(
-    '%s should correctly read number value `%s` == `%s`',
-    (key: string, value: string, result: number) => {
-      const builder = new EnvVariableBuilder(key, value)
-
-      expect(builder.number()).toEqual(result)
-    }
-  )
-
-  it('should correctly read string Enum value', () => {
-    const key = Object.keys(TestStringEnum)[0]
-    const value = Object.values(TestStringEnum)[0]
-    const builder = new EnvVariableBuilder(key, value)
-
-    expect(builder.enum(TestStringEnum)).toEqual(value)
-  })
-
-  it("should throw UnexpectedValueError if string Enum value doesn't exist", () => {
-    const builder = new EnvVariableBuilder('TestStringEnum', 'invalid')
-
-    expect(() => builder.enum(TestStringEnum)).toThrow(UnexpectedValueError)
-  })
-
-  it('should correctly read number Enum value', () => {
-    const value = '5'
-    const builder = new EnvVariableBuilder('TestNumericEnum1', value)
-
-    expect(builder.enum(TestNumericEnum)).toEqual(value)
-  })
-
-  it("should throw UnexpectedValueError if numeric Enum value doesn't exist", () => {
-    const builder = new EnvVariableBuilder('TestNumericEnum2', '4')
-
-    expect(() => builder.enum(TestNumericEnum)).toThrow(UnexpectedValueError)
-  })
-
-  it('should not throw MissingRequiredVariableError if required value exist', () => {
-    const builder = new EnvVariableBuilder('required', 'variable')
-
-    expect(() => builder.required()).not.toThrow(MissingRequiredVariableError)
-  })
-
-  it("should throw if required value doesn't exist", () => {
-    const builder = new EnvVariableBuilder('required', undefined)
-
-    expect(() => builder.required()).toThrow(MissingRequiredVariableError)
-  })
-
-  it.each([
-    [true, 'true'],
-    [false, 'false'],
-    ['true', 'true'],
-    ['false', 'false'],
-    [0, '0'],
-    [123, '123'],
-    [-123, '-123'],
-    [1.23, '1.23'],
-    [0.23, '0.23'],
-    ['some string', 'some string'],
-    ['', ''],
-  ])(
-    "should set the default value [%s] if env value doesn't exist",
-    (def, expected) => {
-      const builder = new EnvVariableBuilder('default')
-
-      expect(builder.default(def).string()).toEqual(expected)
-    }
-  )
-
-  it.each([
-    [true],
-    [false],
-    ['true'],
-    ['false'],
-    [0],
-    [123],
-    [-123],
-    [1.23],
-    [0.23],
-    ['some string'],
-    [''],
-  ])('should not set the default value [%s] if env value exist', (def) => {
-    const builder = new EnvVariableBuilder('default_1', 'variable')
-
-    expect(builder.default(def).string()).toEqual('variable')
-  })
-
-  it.each([
-    ['', ''],
-    ['    ', ''],
-    ['  ', ''],
-    ['    ', ''],
-    [' test ', 'test'],
-    ['  123', '123'],
-    ['true  ', 'true'],
-  ])('should trim the value [%s] -> [%s]', (value, expected) => {
-    const builder = new EnvVariableBuilder('trim', value)
-
-    expect(builder.trim().string()).toEqual(expected)
-  })
-
-  it.each([
-    ['0', -10, 10, 0],
-    ['-10', -10, 10, -10],
-    ['10', -10, 10, 10],
-    ['1.99', 1, 2, 1.99],
-    ['-1.99', -2, -1, -1.99],
-    ['0', 0, 0, 0],
-    ['9999', Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY, 9999],
-  ])(
-    'should validate range of the value %s > %s && < %s -> %s',
-    (value, from, to, expected) => {
-      const builder = new EnvVariableBuilder('range', value)
-
-      expect(builder.range(from, to)).toEqual(expected)
-    }
-  )
-
-  it('should not validate range if value is undefined', () => {
-    const builder = new EnvVariableBuilder('range', undefined)
-
-    expect(builder.range(1, -1)).toEqual(NaN)
-  })
-
-  it.each([
-    ['100', -10, 10],
-    ['-1', 0, 10],
-    ['0', 10, -10],
-  ])(
-    'should validate range of the value %s > %s && < %s and throw an UnexpectedValueError',
-    (value, from, to) => {
-      const builder = new EnvVariableBuilder('range', value)
-
-      expect(() => builder.range(from, to)).toThrow(UnexpectedValueError)
-    }
-  )
-})
diff --git a/src/__tests__/VariableBuilder.test.ts b/src/__tests__/VariableBuilder.test.ts
new file mode 100644
index 0000000..e4aac28
--- /dev/null
+++ b/src/__tests__/VariableBuilder.test.ts
@@ -0,0 +1,152 @@
+import { VariableBuilder } from '../VariableBuilder'
+
+describe('VariableBuilder', () => {
+  enum TestStringEnum {
+    ENUM_VALUE = 'e_value',
+  }
+
+  enum TestNumericEnum {
+    ENUM_VALUE_1,
+    ENUM_VALUE_2,
+    ENUM_VALUE_5 = 5,
+  }
+
+  it('should read value from environment', () => {
+    const builder = new VariableBuilder('TEST_KEY', 'TEST_VALUE')
+
+    expect(builder.string()).toEqual('TEST_VALUE')
+  })
+
+  it.each([
+    ['S1', 'Some String Value', 'Some String Value'],
+    ['S2', '123', '123'],
+    ['S3', '', ''],
+  ])(
+    '%s should correctly read string value `%s` == `%s`',
+    (key: string, value: string | undefined, result: string) => {
+      const builder = new VariableBuilder(key, value)
+
+      expect(builder.string()).toEqual(result)
+      expect(builder.toString()).toEqual(result)
+    }
+  )
+
+  it.each([
+    ['B1', 'true', true],
+    ['B2', 'false', false],
+    ['B3', 'some random string', false],
+    ['B4', '123', false],
+    ['B5', '1', false],
+    ['B6', '0', false],
+    ['B7', '', false],
+  ])(
+    '%s should correctly read boolean value `%s` == `%s`',
+    (key: string, value: string, result: boolean) => {
+      const builder = new VariableBuilder(key, value)
+
+      expect(builder.boolean()).toEqual(result)
+    }
+  )
+
+  it.each([
+    ['N1', '123', 123],
+    ['N2', '-123', -123],
+    ['N3', '0.23', 0.23],
+    ['N4', '2.99', 2.99],
+    ['N5', '.65', 0.65],
+    ['N6', '', 0],
+    ['N7', 'some random string', NaN],
+    ['N8', '1a2', NaN],
+    ['N9', 'a1', NaN],
+    ['N10', '1a', NaN],
+  ])(
+    '%s should correctly read number value `%s` == `%s`',
+    (key: string, value: string, result: number) => {
+      const builder = new VariableBuilder(key, value)
+
+      expect(builder.number()).toEqual(result)
+    }
+  )
+
+  it('should correctly read string Enum value', () => {
+    const key = Object.keys(TestStringEnum)[0]
+    const value = Object.values(TestStringEnum)[0]
+    const builder = new VariableBuilder(key, value)
+
+    expect(builder.enum(TestStringEnum)).toEqual(value)
+  })
+
+  it("should throw Error if string Enum value doesn't exist", () => {
+    const builder = new VariableBuilder('TestStringEnum', 'invalid')
+
+    expect(() => builder.enum(TestStringEnum)).toThrow(Error)
+  })
+
+  it('should correctly read number Enum value', () => {
+    const value = '5'
+    const builder = new VariableBuilder('TestNumericEnum1', value)
+
+    expect(builder.enum(TestNumericEnum)).toEqual(value)
+  })
+
+  it("should throw Error if numeric Enum value doesn't exist", () => {
+    const builder = new VariableBuilder('TestNumericEnum2', '4')
+
+    expect(() => builder.enum(TestNumericEnum)).toThrow(Error)
+  })
+
+  it('should not throw Error if required value exist', () => {
+    const builder = new VariableBuilder('required', 'value')
+
+    expect(() => builder.string()).not.toThrow(Error)
+  })
+
+  it("should throw if required value doesn't exist", () => {
+    const builder = new VariableBuilder('required', undefined)
+
+    expect(() => builder.string()).toThrow(Error)
+  })
+
+  it.each([
+    [['a', 'b', 'c']],
+    [{ a: 1, b: 2, c: 3}],
+    ['"string"']
+  ])(
+    'should decode JSON: %s',
+    (value) => {
+      const builder = new VariableBuilder('range', JSON.stringify(value))
+
+      expect(builder.json()).toEqual(value)
+    }
+  )
+
+  it.each([
+    ['0', -10, 10],
+    ['-10', -10, 10],
+    ['10', -10, 10],
+    ['1.99', 1, 2],
+    ['-1.99', -2, -1],
+    ['0', 0, 0],
+    ['9999', Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY],
+  ])(
+    'should validate range of the value %s >= %s and <= %s -> %s',
+    (value, from, to) => {
+      const builder = new VariableBuilder('range', value)
+
+      expect(builder.range(from, to)).toEqual(Number(value))
+    }
+  )
+
+  it.each([
+    ['100', -10, 10],
+    ['-1', 0, 10],
+    ['0', 10, -10],
+  ])(
+    'should validate range of the value %s > %s && < %s and throw an Error',
+    (value, from, to) => {
+      const builder = new VariableBuilder('range', value)
+
+      expect(() => builder.range(from, to)).toThrow(Error)
+    }
+  )
+})
diff --git a/src/__tests__/env.ts b/src/__tests__/env.ts
index 098ec0c..ae1492a 100644
--- a/src/__tests__/env.ts
+++ b/src/__tests__/env.ts
@@ -1,25 +1,66 @@
 import { env } from '../env'
 
-jest.mock('../EnvVariableBuilder')
-const { EnvVariableBuilder: EnvVariableBuilderMock } = jest.requireMock(
-  '../EnvVariableBuilder'
+jest.mock('../VariableBuilder')
+const { VariableBuilder } = jest.requireMock(
+  '../VariableBuilder'
 )
 
+const testEnvKey = 'KAMINOONI_ENV_TEST_VARIABLE'
+
 describe('env', () => {
   beforeEach(() => {
-    EnvVariableBuilderMock.mockClear()
+    VariableBuilder.mockClear()
+    delete process.env[testEnvKey]
   })
 
-  it.each([['test'], ['123'], ['true'], ['df13']])(
-    'should read env variable and return EnvVariableBuilder for [%s] value',
+  it.each([['test'], ['123'], ['true'], ['df13'], ['default']])(
+    'should read env variable and return VariableBuilder for [%s] value',
     (value) => {
-      process.env['test'] = value
-      env('test')
+      process.env[testEnvKey] = value
+      env(testEnvKey)
 
-      expect(EnvVariableBuilderMock).toBeCalledWith('test', value)
-      expect(EnvVariableBuilderMock).toBeCalledTimes(1)
+      expect(VariableBuilder).toBeCalledWith(testEnvKey, value)
+      expect(VariableBuilder).toBeCalledTimes(1)
+    }
+  )
 
-      delete process.env['test']
+  it.each([
+    [true, 'true'],
+    [false, 'false'],
+    ['true', 'true'],
+    ['false', 'false'],
+    [0, '0'],
+    [123, '123'],
+    [-123, '-123'],
+    [1.23, '1.23'],
+    [0.23, '0.23'],
+    ['some string', 'some string'],
+    ['', ''],
+  ])(
+    "should set the default value [%s] if env value doesn't exist",
+    (def, expected) => {
+      env(testEnvKey, def)
+      expect(VariableBuilder).toBeCalledWith(testEnvKey, expected)
+      expect(VariableBuilder).toBeCalledTimes(1)
     }
   )
+
+  it.each([
+    [true],
+    [false],
+    ['true'],
+    ['false'],
+    [0],
+    [123],
+    [-123],
+    [1.23],
+    [0.23],
+    ['some string'],
+    [''],
+  ])('should not set the default value [%s] if env value exist', (def) => {
+    process.env[testEnvKey] = 'value'
+    env(testEnvKey, def)
+    expect(VariableBuilder).toBeCalledWith(testEnvKey, 'value')
+    expect(VariableBuilder).toBeCalledTimes(1)
+  })
 })
diff --git a/src/env.ts b/src/env.ts
index 31079ae..0376aa4 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -1,7 +1,15 @@
-import { EnvVariableBuilder } from './EnvVariableBuilder'
+import { VariableBuilder } from "./VariableBuilder";
+
+const simpleTypes = ["string", "number", "boolean", "undefined"];
 
 /**
  * @param key Env variable name
+ * @param defaultValue Default env variable
  */
-export const env = (key: string) =>
-  new EnvVariableBuilder(key, process.env[key])
+export const env = <T>(key: string, defaultValue?: T) => {
+  let fallback = simpleTypes.includes(typeof defaultValue)
+    ? defaultValue?.toString()
+    : JSON.stringify(defaultValue)
+
+  return new VariableBuilder(key, process.env[key] ?? fallback);
+};
diff --git a/src/errors/EnvVariableBuilderError.ts b/src/errors/EnvVariableBuilderError.ts
deleted file mode 100644
index 88bb72e..0000000
--- a/src/errors/EnvVariableBuilderError.ts
+++ /dev/null
@@ -1 +0,0 @@
-export abstract class EnvVariableBuilderError extends Error {}
diff --git a/src/errors/MissingRequiredVariableError.ts b/src/errors/MissingRequiredVariableError.ts
deleted file mode 100644
index a14a753..0000000
--- a/src/errors/MissingRequiredVariableError.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { EnvVariableBuilderError } from './EnvVariableBuilderError'
-
-export class MissingRequiredVariableError extends EnvVariableBuilderError {
-  constructor(name: string) {
-    super(`Required env variable '${name}' not found`)
-  }
-}
diff --git a/src/errors/UnexpectedValueError.ts b/src/errors/UnexpectedValueError.ts
deleted file mode 100644
index 409b433..0000000
--- a/src/errors/UnexpectedValueError.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { EnvVariableBuilderError } from './EnvVariableBuilderError'
-
-export class UnexpectedValueError extends EnvVariableBuilderError {
-  constructor(name: string, value?: string) {
-    super(`Unexpected env variable value '${name}=${value}'`)
-  }
-}
diff --git a/src/errors/__tests__/MissingRequiredVariableError.test.ts b/src/errors/__tests__/MissingRequiredVariableError.test.ts
deleted file mode 100644
index 7ace5b2..0000000
--- a/src/errors/__tests__/MissingRequiredVariableError.test.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { MissingRequiredVariableError } from '../MissingRequiredVariableError'
-
-describe('MissingRequiredVariableError', () => {
-  it('should have correct error message', () => {
-    const error = new MissingRequiredVariableError('TEST_VAR')
-
-    expect(error.message).toEqual("Required env variable 'TEST_VAR' not found")
-  })
-})
diff --git a/src/errors/__tests__/UnexpectedValueError.test.ts b/src/errors/__tests__/UnexpectedValueError.test.ts
deleted file mode 100644
index c57010d..0000000
--- a/src/errors/__tests__/UnexpectedValueError.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { UnexpectedValueError } from '../UnexpectedValueError'
-
-describe('UnexpectedValueError', () => {
-  it('should have correct error message', () => {
-    const error = new UnexpectedValueError('TEST_VAR', 'TEST_VALUE')
-
-    expect(error.message).toEqual(
-      `Unexpected env variable value 'TEST_VAR=TEST_VALUE'`
-    )
-  })
-})
diff --git a/src/errors/index.ts b/src/errors/index.ts
deleted file mode 100644
index 5b19e71..0000000
--- a/src/errors/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export * from './EnvVariableBuilderError'
-export * from './MissingRequiredVariableError'
-export * from './UnexpectedValueError'
diff --git a/src/index.ts b/src/index.ts
index c8f0a1c..40238d6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,2 +1 @@
 export { env } from './env'
-export * from './errors'