Does it use a library?

No. The parser is hand-written and runs entirely in your browser — no dependencies.

Which TypeScript features are supported?

interface, type alias, optional fields (?), arrays, union types including null, inline objects, and Date.

TypeScript to JSON Schema

Runs in browser

Convert TypeScript interfaces and types to JSON Schema instantly.

Convert TypeScript interfaces and types to JSON Schema instantly. Fully client-side, no uploads.

TypeScript Interface / Type / File

JSON Schema (draft-07)

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Category",
  "type": "object",
  "properties": {
    "id": {
      "type": "string"
    },
    "name": {
      "type": "string"
    },
    "description": {
      "type": "string"
    },
    "slug": {
      "type": "string"
    }
  },
  "required": [
    "id",
    "name",
    "description",
    "slug"
  ],
  "additionalProperties": false
}

🔒 Runs in your browser · No uploads · Your data never leaves your device

How to use

Paste TypeScript
Paste an interface or type alias into the left panel.
Get JSON Schema
JSON Schema draft-07 appears instantly in the right panel.
Copy
Click Copy JSON Schema to copy the output.

Common use cases

Generating runtime validators from TypeScript types — Convert TypeScript interfaces to JSON Schema to use with ajv or similar validators for runtime data validation.
Documenting TypeScript APIs — Generate JSON Schema from TypeScript types to include in API documentation alongside endpoint descriptions.

Examples

Interface to schema

User interface with optional email field.

Input

interface User {
  id: number;
  name: string;
  email?: string;
}

Output

{"$schema":"http://json-schema.org/draft-07/schema#","title":"User","type":"object","properties":{"id":{"type":"number"},"name":{"type":"string"},"email":{"type":"string"}},"required":["id","name"],"additionalProperties":false}

Frequently asked questions

Does it use a library?: No. The parser is hand-written and runs entirely in your browser — no dependencies.
Which TypeScript features are supported?: interface, type alias, optional fields (?), arrays, union types including null, inline objects, and Date.

Key concepts

TypeScript interface: A compile-time structure defining object shape in TypeScript — no runtime representation exists unless converted.
JSON Schema: A runtime-usable format for describing and validating data structures, compatible with many validators and code generators.

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