Developer Tools

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.

Generate JSON Schema From Sample JSON Online

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

JSON input

Show line numbers

Generated JSON Schema

{
  "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.

Why Use This JSON Schema Generator

Inspect and transform developer-focused text quickly
Copy results for debugging, documentation, and integrations
Use sample input for quick testing
Download the output as a file

Related Developer Tools

Common Situations Where This Helps

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 Guides

How to Generate a JSON Schema From Sample Data

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.