JSON Schema Generator

Generate a JSON Schema draft from sample JSON input.

What this tool does

Create a draft JSON Schema from sample JSON to document and validate API payload structures.

Tool interface

Input

Output

Example input

{"id":1,"name":"Ana","active":true,"tags":["admin"],"profile":{"city":"Melbourne"}}

Example output

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "name": {
      "type": "string"
    }
  },
  "required": [
    "id",
    "name"
  ]
}

Step-by-step instructions

  1. Paste a JSON object or array as sample input.
  2. Click Transform to infer a schema.
  3. Copy or download the generated schema JSON.

Common use cases

  • Validating and formatting API payloads during debugging.
  • Transforming JSON into spreadsheet-friendly formats.
  • Cleaning JSON files before using them in applications.

Speeds up schema documentation, payload validation setup, and API contract communication.

Common mistakes to avoid

  • Pasting partial JSON fragments instead of complete valid objects or arrays.
  • Assuming nested keys flatten automatically without checking output columns.
  • Mixing JSON arrays and objects when the tool expects one specific structure.

Frequently Asked Questions

Can this infer nested objects and arrays?

Yes. Nested values are represented in the generated schema.

Which JSON Schema draft is used?

The output includes Draft-07 schema metadata.

What input format does JSON Schema Generator expect?

Use valid JSON input unless the tool explicitly asks for path or pattern syntax first.

What does JSON Schema Generator output?

It returns transformed output you can copy or download as `schema.json`.

Why might JSON Schema Generator return an error?

Most failures come from malformed input that does not match the expected format.

Does JSON Schema Generator run in the browser?

Yes. Transformations are designed for in-browser usage so you can test and iterate quickly.

Can I copy or download results from JSON Schema Generator?

Yes. You can copy the result or use the download action when file output is available.

Related tools

Related guides

Browse all DataToolbox guides for more workflows.

Related categories

Looking for other utilities in this area? JSON Tools, Developer Data Tools