JSON to JavaScript JSDoc Converter

Generate JSDoc typedefs from sample JSON when you want autocomplete, editor hints, and reusable type docs in plain JavaScript projects without moving to TypeScript.

How to use

  1. Paste a representative JSON object that matches the response or config shape you want to document.
  2. Review the generated JSDoc typedef blocks and property types for nested objects, arrays, and optional fields.
  3. Copy the typedefs into your JavaScript module, utility layer, or shared documentation block.

Benefits

  • Improves autocomplete and editor understanding in plain JavaScript codebases.
  • Keeps lightweight type documentation close to the modules that consume the data.
  • Helps teams strengthen JS contracts without a full TypeScript migration.

Best use cases

  • Plain JavaScript apps that want stronger IDE hints without changing the build stack.
  • Shared utility modules where typedef documentation improves handoff and maintenance.
  • Teams gradually tightening data contracts before a broader TypeScript adoption.

JSDoc tips

  • Keep the sample payload realistic so optional fields and nested objects are inferred accurately.
  • Place typedef blocks near the functions or modules that consume the shape most often.
  • Use the PropTypes route instead when your main goal is runtime validation for React components.

Implementation tips

  • Place generated typedef blocks near the modules that consume the data shape most often.
  • Keep the sample payload close to real responses so optional fields are inferred accurately.
  • Use the PropTypes route instead when you need runtime React validation rather than documentation-only hints.

Sample JSON

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true,
  "roles": ["admin", "editor"],
  "profile": {
    "email": "ada@example.com",
    "score": 9.8
  }
}

Sample output

/**
 * @typedef {Object} UserModel
 * @property {number} id
 * @property {string} name
 * @property {boolean} active
 */

FAQ

When should I choose JSDoc output instead of PropTypes?

Choose JSDoc when you want editor hints, documentation, and lightweight static guidance in plain JavaScript modules. Choose PropTypes when you need runtime validation on React component props.

Does the JSDoc route work well for nested JSON payloads?

Yes. Nested objects and arrays are represented in the generated typedef blocks so larger response shapes stay documented.