JSON Schema Generator

Paste sample JSON and instantly generate a JSON Schema that describes its structure. This page is useful for validation, API contracts, docs, fixtures, and general developer workflows.

JSON input

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Generated JSON Schema

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{
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "enabled": {
      "type": "boolean"
    },
    "count": {
      "type": "integer"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "meta": {
      "type": "object",
      "properties": {
        "theme": {
          "type": "string"
        }
      },
      "required": ["theme"]
    }
  },
  "required": ["name", "enabled", "count", "tags", "meta"]
}

Paste content and run the tool instantly.

This tool runs entirely in your browser, so you can inspect, transform, or generate developer text without sending it to a remote processing service.

Generate JSON Schema From Sample JSON Online

Generate a JSON Schema from sample JSON online for validation, docs, API contracts, fixtures, and developer workflows.

How to use JSON Schema Generator

Paste content into the json input panel.

Run the tool to generate the generated json schema.

Copy or download the result once it looks right.

Why this helps in real workflows

You need a schema for an API payload or sample response.

You want to build validation rules from real JSON data quickly.

You need a clearer contract for a config file or fixture.

You want to document the shape of nested JSON without writing the schema by hand.

Which tool should you choose?

Schema generator: Use this when you want a structural JSON Schema based on sample data.

Common problems and fixes

I have sample JSON but no schema yet.

Generate the schema first, then refine it for stricter validation if needed.

Nested JSON is hard to document manually.

Use the generator to build the initial structure and property list for you.

I want a starting point for validation rules.

Generate the schema from a sample payload and refine it afterward.

Related tools

Frequently asked questions

How do I generate a JSON Schema?

Paste sample JSON into the input box, run the generator, and copy the generated schema.

What does the schema generator infer?

It infers JSON types, object properties, array items, and required object keys from the sample input.

Is this JSON Schema generator free?

Yes. It is free to use in your browser.

JSON Schema Generator 🔒 Runs in your browser. No input data is sent to our server.