diff --git a/lib/markdown-to-jsonapi.js b/lib/markdown-to-jsonapi.js
index 6b9bb0e..662c85c 100644
--- a/lib/markdown-to-jsonapi.js
+++ b/lib/markdown-to-jsonapi.js
@@ -4,8 +4,9 @@ const showdown = require('showdown');
 const _ = require('lodash');
 const h2p = require('html2plaintext');
 const { Serializer } = require('jsonapi-serializer');
+const { JSDOM } = require('jsdom');
 
-const supportedContentTypes = ['content', 'html', 'description'];
+const supportedContentTypes = ['content', 'html', 'description', 'toc'];
 
 class MarkDownToJsonApi extends PersistentFilter {
   constructor(folder, options) {
@@ -63,12 +64,23 @@ class MarkDownToJsonApi extends PersistentFilter {
   processString(content, relativePath) {
     const front = yamlFront.loadFront(content);
     const markdown = front.__content.trim();
+    const html = this.converter.makeHtml(markdown);
+
+    const dom = new JSDOM(html);
+    const headingNodes = dom.window.document.querySelectorAll('h1, h2, h3, h4, h5');
+
+    const toc = [...headingNodes].map((heading) => ({
+      text: heading.textContent,
+      depth: heading.nodeName.replace(/\D/g, ''),
+      id: heading.getAttribute('id'),
+    }));
 
     const baseProperties = {
       path: relativePath,
       id: relativePath.replace(/\.(md|markdown)$/, ''),
       content: markdown,
-      html: this.converter.makeHtml(markdown),
+      html,
+      toc,
     };
 
     const resultHash = { ...baseProperties, ...front };
diff --git a/package-lock.json b/package-lock.json
index 5295ba3..fc4c7c0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "debug": "^4.1.1",
         "html2plaintext": "^2.1.2",
         "js-yaml": "^3.13.1",
+        "jsdom": "^17.0.0",
         "jsonapi-serializer": "^3.6.5",
         "lodash": "^4.17.15",
         "mkdirp": "^0.5.1",
@@ -605,7 +606,6 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
       "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
-      "dev": true,
       "engines": {
         "node": ">= 6"
       }
@@ -679,11 +679,15 @@
       "integrity": "sha1-EHPEvIJHVK49EM+riKsCN7qWTk0=",
       "dev": true
     },
+    "node_modules/abab": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.5.tgz",
+      "integrity": "sha512-9IK9EadsbHo6jLWIpxpR6pL0sazTXV6+SQv25ZB+F7Bj9mJNaOc4nCRabwd5M/JwmUa8idz6Eci6eKfJryPs6Q=="
+    },
     "node_modules/acorn": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
-      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
-      "dev": true,
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -691,17 +695,33 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/acorn-globals": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-6.0.0.tgz",
+      "integrity": "sha512-ZQl7LOWaF5ePqqcX4hLuv/bLXYQNfNWw2c0/yX/TsPRKamzHcTGQnlCjHT3TsmkOUVEPS3crCxiPfdzE/Trlhg==",
+      "dependencies": {
+        "acorn": "^7.1.1",
+        "acorn-walk": "^7.1.1"
+      }
+    },
     "node_modules/acorn-jsx": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
       "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
       "dev": true
     },
+    "node_modules/acorn-walk": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
+      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/agent-base": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
       "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
-      "dev": true,
       "dependencies": {
         "debug": "4"
       },
@@ -1170,8 +1190,7 @@
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
-      "dev": true
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
     },
     "node_modules/atob": {
       "version": "2.1.2",
@@ -2209,6 +2228,11 @@
         "matcher-collection": "^1.0.0"
       }
     },
+    "node_modules/browser-process-hrtime": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz",
+      "integrity": "sha512-9o5UecI3GhkpM6DrXr69PblIuWxPKk9Y0jHBRhdocZ2y7YECBFCsHm79Pr3OyR2AvjhDkabFJaDJMYRazHgsow=="
+    },
     "node_modules/browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
@@ -2787,7 +2811,6 @@
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
       "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
-      "dev": true,
       "dependencies": {
         "delayed-stream": "~1.0.0"
       },
@@ -2994,6 +3017,40 @@
         "node": "*"
       }
     },
+    "node_modules/cssom": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.5.0.tgz",
+      "integrity": "sha512-iKuQcq+NdHqlAcwUY0o/HL69XQrUaQdMjmStJ8JFmUaiiQErlhrmuigkg/CU4E2J0IyUKUrMAgl36TvN67MqTw=="
+    },
+    "node_modules/cssstyle": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.3.0.tgz",
+      "integrity": "sha512-AZL67abkUzIuvcHqk7c09cezpGNcxUxU4Ioi/05xHk4DQeTkWmGYftIE6ctU6AEt+Gn4n1lDStOtj7FKycP71A==",
+      "dependencies": {
+        "cssom": "~0.3.6"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cssstyle/node_modules/cssom": {
+      "version": "0.3.8",
+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
+      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+    },
+    "node_modules/data-urls": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-3.0.0.tgz",
+      "integrity": "sha512-4AefxbTTdFtxDUdh0BuMBs2qJVL25Mow2zlcuuePegQwgD6GEmQao42LLEeksOui8nL4RcNEugIpFP7eRd33xg==",
+      "dependencies": {
+        "abab": "^2.0.3",
+        "whatwg-mimetype": "^2.3.0",
+        "whatwg-url": "^9.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/debug": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
@@ -3023,6 +3080,11 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/decimal.js": {
+      "version": "10.3.1",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.3.1.tgz",
+      "integrity": "sha512-V0pfhfr8suzyPGOx3nmq4aHqabehUZn6Ch9kyFpV79TGDTWFmHqUqXdabR7QHqxzrYolF4+tVmJhUG4OURg5dQ=="
+    },
     "node_modules/decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
@@ -3083,8 +3145,7 @@
     "node_modules/deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
-      "dev": true
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
     "node_modules/default-require-extensions": {
       "version": "3.0.0",
@@ -3192,7 +3253,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true,
       "engines": {
         "node": ">=0.4.0"
       }
@@ -3304,6 +3364,25 @@
       "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
       "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w=="
     },
+    "node_modules/domexception": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/domexception/-/domexception-2.0.1.tgz",
+      "integrity": "sha512-yxJ2mFy/sibVQlu5qHjOkf9J3K6zgmCxgJ94u2EdvDOV09H+32LtRswEcUsmUWN72pVLOEnTSRaIVVzVQgS0dg==",
+      "dependencies": {
+        "webidl-conversions": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/domexception/node_modules/webidl-conversions": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-5.0.0.tgz",
+      "integrity": "sha512-VlZwKPCkYKxQgeSbH5EyngOmRp7Ww7I9rQLERETtf5ofd9pGeswWiOtogpEO850jziPRarreGxn5QIiTqpb2wA==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/domhandler": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
@@ -3484,6 +3563,44 @@
         "node": ">=0.8.0"
       }
     },
+    "node_modules/escodegen": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-2.0.0.tgz",
+      "integrity": "sha512-mmHKys/C8BFUGI+MAWNcSYoORYLMdPzjrknd2Vc+bUsjN5bXcr8EhrNB+UTqfL1y3I9c4fw2ihgtMPQLBRiQxw==",
+      "dependencies": {
+        "esprima": "^4.0.1",
+        "estraverse": "^5.2.0",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1"
+      },
+      "bin": {
+        "escodegen": "bin/escodegen.js",
+        "esgenerate": "bin/esgenerate.js"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "optionalDependencies": {
+        "source-map": "~0.6.1"
+      }
+    },
+    "node_modules/escodegen/node_modules/estraverse": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.2.0.tgz",
+      "integrity": "sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ==",
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
+    "node_modules/escodegen/node_modules/source-map": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "optional": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/eslint": {
       "version": "6.8.0",
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.8.0.tgz",
@@ -3935,7 +4052,6 @@
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
       "integrity": "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==",
-      "dev": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -4346,8 +4462,7 @@
     "node_modules/fast-levenshtein": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
-      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
-      "dev": true
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc="
     },
     "node_modules/fast-ordered-set": {
       "version": "1.0.3",
@@ -4721,7 +4836,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.0.tgz",
       "integrity": "sha512-ETEklSGi5t0QMZuiXoA/Q6vcnxcLQP5vdugSpuAyi6SVGi2clPPp+xgEhuMaHC+zGgn31Kd235W35f7Hykkaww==",
-      "dev": true,
       "dependencies": {
         "asynckit": "^0.4.0",
         "combined-stream": "^1.0.8",
@@ -5355,6 +5469,17 @@
       "integrity": "sha512-kssjab8CvdXfcXMXVcvsXum4Hwdq9XGtRD3TteMEvEbq0LXyiNQr6AprqKqfeaDXze7SxWvRxdpwE6ku7ikLkg==",
       "dev": true
     },
+    "node_modules/html-encoding-sniffer": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-2.0.1.tgz",
+      "integrity": "sha512-D5JbOMBIR/TVZkubHT+OyT2705QvogUW4IBn6nHd756OwieSF9aDYFj4dv6HHEVGYbHaLETa3WggZYWWMyy3ZQ==",
+      "dependencies": {
+        "whatwg-encoding": "^1.0.5"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/html-escaper": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.0.tgz",
@@ -5438,7 +5563,6 @@
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-4.0.1.tgz",
       "integrity": "sha512-k0zdNgqWTGA6aeIRVpvfVob4fL52dTfaehylg0Y4UvSySvOq/Y+BOyPrgpUrA7HylqvU8vIZGsRuXmspskV0Tg==",
-      "dev": true,
       "dependencies": {
         "@tootallnate/once": "1",
         "agent-base": "6",
@@ -5471,7 +5595,6 @@
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.0.tgz",
       "integrity": "sha512-EkYm5BcKUGiduxzSt3Eppko+PiNWNEpa4ySk9vTC6wDsQJW9rHSa+UhGNJoRYp7bz6Ht1eaRIa6QaJqO5rCFbA==",
-      "dev": true,
       "dependencies": {
         "agent-base": "6",
         "debug": "4"
@@ -5502,7 +5625,6 @@
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
       "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
-      "dev": true,
       "dependencies": {
         "safer-buffer": ">= 2.1.2 < 3"
       },
@@ -5958,6 +6080,11 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/is-potential-custom-element-name": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
+      "integrity": "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ=="
+    },
     "node_modules/is-regex": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.4.tgz",
@@ -6290,6 +6417,67 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsdom": {
+      "version": "17.0.0",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-17.0.0.tgz",
+      "integrity": "sha512-MUq4XdqwtNurZDVeKScENMPHnkgmdIvMzZ1r1NSwHkDuaqI6BouPjr+17COo4/19oLNnmdpFDPOHVpgIZmZ+VA==",
+      "dependencies": {
+        "abab": "^2.0.5",
+        "acorn": "^8.4.1",
+        "acorn-globals": "^6.0.0",
+        "cssom": "^0.5.0",
+        "cssstyle": "^2.3.0",
+        "data-urls": "^3.0.0",
+        "decimal.js": "^10.3.1",
+        "domexception": "^2.0.1",
+        "escodegen": "^2.0.0",
+        "form-data": "^4.0.0",
+        "html-encoding-sniffer": "^2.0.1",
+        "http-proxy-agent": "^4.0.1",
+        "https-proxy-agent": "^5.0.0",
+        "is-potential-custom-element-name": "^1.0.1",
+        "nwsapi": "^2.2.0",
+        "parse5": "6.0.1",
+        "saxes": "^5.0.1",
+        "symbol-tree": "^3.2.4",
+        "tough-cookie": "^4.0.0",
+        "w3c-hr-time": "^1.0.2",
+        "w3c-xmlserializer": "^2.0.0",
+        "webidl-conversions": "^6.1.0",
+        "whatwg-encoding": "^1.0.5",
+        "whatwg-mimetype": "^2.3.0",
+        "whatwg-url": "^9.0.0",
+        "ws": "^8.0.0",
+        "xml-name-validator": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "peerDependencies": {
+        "canvas": "^2.5.0"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/jsdom/node_modules/acorn": {
+      "version": "8.5.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.5.0.tgz",
+      "integrity": "sha512-yXbYeFy+jUuYd3/CDcg2NkIYE991XYX/bje7LmjJigUciaeO1JR4XxXgCIV1/Zc/dRuFEyw1L0pbA+qynJkW5Q==",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/jsdom/node_modules/parse5": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-6.0.1.tgz",
+      "integrity": "sha512-Ofn/CTFzRGTTxwpNEs9PP93gXShHcTq255nzRYSKe8AkVpZY7e1fpmTfOyoIvjP5HG7Z2ZM7VS9PPhQGW2pOpw=="
+    },
     "node_modules/jsesc": {
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+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g=="
+    },
+    "whatwg-url": {
+      "version": "9.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-9.1.0.tgz",
+      "integrity": "sha512-CQ0UcrPHyomtlOCot1TL77WyMIm/bCwrJ2D6AOKGwEczU9EpyoqAokfqrf/MioU9kHcMsmJZcg1egXix2KYEsA==",
+      "requires": {
+        "tr46": "^2.1.0",
+        "webidl-conversions": "^6.1.0"
+      }
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
@@ -20778,8 +21310,7 @@
     "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==",
-      "dev": true
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ=="
     },
     "wordwrap": {
       "version": "1.0.0",
@@ -20837,12 +21368,28 @@
         "typedarray-to-buffer": "^3.1.5"
       }
     },
+    "ws": {
+      "version": "8.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.2.2.tgz",
+      "integrity": "sha512-Q6B6H2oc8QY3llc3cB8kVmQ6pnJWVQbP7Q5algTcIxx7YEpc0oU4NBVHlztA7Ekzfhw2r0rPducMUiCGWKQRzw==",
+      "requires": {}
+    },
     "xdg-basedir": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-4.0.0.tgz",
       "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==",
       "dev": true
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw=="
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
diff --git a/package.json b/package.json
index b8ffa89..40a3c38 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "debug": "^4.1.1",
     "html2plaintext": "^2.1.2",
     "js-yaml": "^3.13.1",
+    "jsdom": "^17.0.0",
     "jsonapi-serializer": "^3.6.5",
     "lodash": "^4.17.15",
     "mkdirp": "^0.5.1",
diff --git a/test/attributes.js b/test/attributes.js
index b86436f..4a541a5 100644
--- a/test/attributes.js
+++ b/test/attributes.js
@@ -185,4 +185,52 @@ This is where I write my really long essay to the world. I will start off bing *
     expect(error, 'Build did not error').to.be.ok;
     expect(error.message).to.equal('Unknown content type: faceyFace');
   });
+
+  it.only('should include page table of contents if included in contentTypes', async () => {
+    const result = await buildSingleFile(`# Hello world
+
+This is the first part
+
+## Second point
+
+I really like programming.
+
+### Second part sub point
+
+more info about programming
+
+## Third part
+
+how about now
+
+### Sub point
+more stuff
+
+
+#### Sub sub point
+
+even more stuff
+
+##### Sub sub sub point
+
+you're being silly now
+
+`, {
+      contentTypes: ['toc'],
+    });
+
+    expect(result.attributes.toc).to.deep.equal([
+      { text: 'Hello world', depth: '1', id: 'helloworld' },
+      { text: 'Second point', depth: '2', id: 'secondpoint' },
+      {
+        text: 'Second part sub point',
+        depth: '3',
+        id: 'secondpartsubpoint',
+      },
+      { text: 'Third part', depth: '2', id: 'thirdpart' },
+      { text: 'Sub point', depth: '3', id: 'subpoint' },
+      { text: 'Sub sub point', depth: '4', id: 'subsubpoint' },
+      { text: 'Sub sub sub point', depth: '5', id: 'subsubsubpoint' },
+    ]);
+  });
 });