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Turn a JSON sample into a JSON Schema and a TypeScript type, with optional keys and formats inferred.

JSON to schemaFreeFor developers and agent builders

10 min

saved on a typical run. Our estimate, against writing the schema and the TypeScript type by hand for an object of about six keys.

Before: what you give it

The example input, as typed in. You paste a JSON sample.

json: [{"id":"3f2a9c1e-7b4d-4e8a-9c1d-2a6b8e4f1c0d","email":"ana@example.com","plan":"pro","seats":4,"renewsAt":"2026-11-01","notes":null},{"id":"9b1c2d3e-4f5a-4b6c-8d7e-1f2a3b4c5d6e","email":"li@example.com","plan":"free","seats":1,"renewsAt":"2026-10-28"}]
name: Account

After: what comes back

The first lines of a real run of the tool's own code on that input. Nothing here is edited by hand.

export interface Account {
  id: string;
  email: string;
  plan: string;
  seats: number;
  renewsAt: string;
  notes?: null;
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Account",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
... full output on the tool page

What you get

A 2020-12 JSON Schema, a matching TypeScript interface, and a list of every guess made

What it cannot do

Infers from the samples you give it; a key absent from every sample is unknown to it. Free tier reads 20,000 characters.

Who it is for

  • Developers
  • Agent builders

Free and Pro

Free30 runs a day per IP address, up to 20,000 characters a run.
ProNo daily limit, 300 requests a minute, up to 200,000 characters a run.

Daily caps for every tool

Use it from your assistant

The tool is called json_to_schema. Connect the server once, then ask for it by name or describe the job. Install steps.

claude mcp add --transport http toolbox https://toolbox.allthepossibles.com/mcp
curl -X POST https://toolbox.allthepossibles.com/api/json-schema -H 'content-type: application/json' -d '{"json":"[{\"id\":\"3f2a9c1e-7b4d-4e8a-9c1d-2a6b8e4f1c0d\",\"email\":\"ana@example.com\",\"plan\":\"pro\",\"seats\":4,\"renewsAt\":\"2026-11-01\",\"notes\":null},{\"id\":\"9b1c2d3e-4f5a-4b6c-8d7e-1f2a3b4c5d6e\",\"email\":\"li@example.com\",\"plan\":\"free\",\"seats\":1,\"renewsAt\":\"2026-10-28\"}]","name":"Account"}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

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