JSON Schema Generator

Infer a JSON Schema (draft 2020-12) from a JSON sample

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Ideal for LLM structured output (OpenAI/Anthropic tool calling), API validation with ajv, or documenting a payload. All fields in the sample are marked required - remove any that are optional.

Cara pakai

  1. 1
    Paste a JSON sample

    Drop a representative object or array - an API response, a config, an LLM function call payload.

  2. 2
    Name the root type

    Give the schema a title (defaults to 'RootSchema'). Used by generators and error messages.

  3. 3
    Copy the schema

    Paste directly into your LLM tool definition, ajv, or API docs.

Tentang JSON Schema Generator

Free online JSON Schema generator. Paste a JSON sample to instantly get a draft-2020-12 JSON Schema with types, required fields, and nested object/array shapes. Ideal for LLM structured output (OpenAI/Anthropic tool calling), ajv validation, and API contracts. JSON Schema Generator di 712 Tools jalan sepenuhnya di browser kamu pakai JavaScript API native - tidak ada server yang pernah melihat data kamu. Artinya hasil instan, privasi penuh, dan tanpa batas upload.

Buat sesi debug, quick sanity check, atau incident produksi - tool ini gratis dipakai sebanyak yang kamu butuh. Tanpa watermark, tanpa signup, dan tanpa ads di dalam tool.

Pertanyaan yang sering ditanyakan

Which JSON Schema draft?

Draft 2020-12 - the current version, and what OpenAI and Anthropic expect for structured output / tool calling.

Are all fields marked required?

Yes - every field in your sample. Remove the ones that are conditional from the required array by hand.

How are arrays typed?

The tool merges all items and produces one items schema. Mixed arrays become a union of types.

Is my JSON sent anywhere?

No. Inference happens entirely in your browser.

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