JSON to JSON Schema Generator — Browser Type Tool

Developer

The JSON to JSON Schema generator is a browser-based developer tool that infers objects, arrays, nulls, numbers, and strings from a JSON sample and emits JSON Schema code.

JSON to JSON Schema

Runs in this browserInput is processed only in this browser. It is not sent to or stored on a server.

JSON input stays in this browser. Generated JSON Schema code is a sample-based draft; review optional fields, sanitized identifiers, semantic types such as dates or URLs, and API version differences before using it.

JSON sample

JSON Schema output

Next actions

JSON to TypeScript Generator JSON to Zod Generator JSON to GraphQL Generator JSON to Go Generator

What is it

Use this tool to paste an API response or config JSON and quickly draft JSON Schema definitions. Keys are sanitized into language identifiers while original JSON keys are preserved through tags or rename metadata. Arrays are scanned across all items, and null values become nullable or union-style output where appropriate.

JSON Schema = render(infer(JSON.parse(sample)))

How to use

1Paste a JSON sample.
2Press Generate JSON Schema.
3Review sanitized identifiers and nullable fields.
4Copy the generated code and adjust it for your project.

Reference

JSON to JSON Schema Generator — Browser Type Tool Reference
Item	Value
Input	JSON sample
Output	JSON Schema
Processing location	Browser
Server upload	None

Sources & standards

MDN Web Docs: Client-side web APIs - MDN Web Docs
JSON - JSON.org
JSON Schema Draft 2020-12 - JSON Schema
TypeScript Handbook - Microsoft

FAQ

Is the JSON sample sent to a server?

No. This generator parses JSON and creates type code in your browser without sending input to a server.

Can I use the generated type directly in production?

Treat it as a draft. Review optional fields, API version differences, and semantic types such as dates or URLs before using it in a project.

How are array types inferred?

All array items are scanned to build a common type. Fields that appear only on some items are marked as optional or represented through nullable/union-style output.