Supple mock server with flexible on-demand response and optional get random fake data using Faker.js

---

Features

• Using Bun
• Written in Typescript
• Flexible on-demand response (can modify body, status, headers, and delayed response)
• Optional get random fake data using Faker.js
• Request body validation using JSON Schema
• No data storage needed

Getting Started

Setup smockr with npm

$ npm install -g @kitabisa/smockr

Setup smockr with bun

$ bun add -g @kitabisa/smockr

Setup smockr with docker

$ docker pull kitabisa/smockr

Quick Start

Run with node or bun

Running mock with default params

$ smockr

Running mock with custom params

$ smockr \
--port 3000 \
--secret "mysecret" \
--allowOrigin "https://kitabisa.com" \
--allowMethods "GET, POST, PATCH" \
--allowHeaders "Content-Type, Authorization"

When you define secret as a parameter and is not empty string, the client request must be include X-Smockr-Secret header with the same value

See a list of all available options

$ smockr --help

See a installed version

$ smockr --version

Run with docker

Running mock with default params

$ docker run -p 8080:8080 --rm \
kitabisa/smockr

Running mock with custom params

$ docker run -p 3000:8080 --rm \
-e SECRET_KEY="mysecret" \
-e ALLOWED_ORIGIN="https://kitabisa.com" \
-e ALLOWED_METHODS="GET, POST, PATCH" \
-e ALLOWED_HEADERS="Content-Type, Authorization" \
kitabisa/smockr

Usage

Body

Specify a search body param to retrieve a response with that body.

GET http://localhost:8080/?mock[response][body]={"ping":"pong"}


HTTP/1.1 200 OK
content-type: application/json
content-length: 18

{
  "ping": "pong"
}

Specify a search body param with random fake data using faker.js api helpers fake.

GET http://localhost:8080/?mock[response][body]={"id":{{number.int({"min":100000,"max":900000})}},"name":"{{person.fullName}}","avatar":"{{image.avatar}}"}


HTTP/1.1 200 OK
content-type: application/json
content-length: 107

{
  "id": 429178,
  "name": "Allen Brown",
  "avatar": "https://avatars.githubusercontent.com/u/97165289"
}

Status

Specify a search status param get back that code status. The status must be inside the range 200 to 599.

GET http://localhost:8080/?mock[response][status]=301


HTTP/1.1 301 Moved Permanently
content-type: application/json
content-length: 0

Headers

Specify a search headers param as json string to get them back.

GET http://localhost:8080/?mock[response][headers]={"x-hello":"world"}


HTTP/1.1 200 OK
content-type: application/json
content-length: 0
x-hello: world

Delay

Specify a search delay param in milliseconds in order to delay the response.

GET http://localhost:8080/?mock[response][delay]=3000


HTTP/1.1 200 OK
content-type: application/json
content-length: 0

Schema Validation

Specify a search schema validation in json schema (stringify) to set request body validation.

POST http://localhost:8080/?mock[request][body][schema]={"type":"object","properties":{"name":{"type":"string"},"age":{"type":"integer","minimum":17}},"required":["name"]}

{
  "age": 20
}


HTTP/1.1 400 Bad Request
content-type: application/json
content-length: 84

{
  "code": 400,
  "message": "Requires property name",
  "type": "SchemaValidationException"
}

Health check

Predefined health check route.

GET http://localhost:8080/health-check


HTTP/1.1 200 OK
content-type: application/json
content-length: 24

{
  "health_check": "up"
}

Caveats

Some cases in production server, there may be problems related to Request-URI too large. If you are using kubernetes ingress, try to apply this configuration:

annotations:
  nginx.ingress.kubernetes.io/client-header-buffer-size: 100k
  nginx.ingress.kubernetes.io/large-client-header-buffers: 4 100k
  nginx.ingress.kubernetes.io/server-snippet: |
    client_header_buffer_size 100k;
    large_client_header_buffers 4 100k;

Contributing

Want to contribute? Awesome! You can find information about contributing to this project in the CONTRIBUTING.md