Free, browser-based utilities for everyday developer workflows

JSON Schema Validator

Validate JSON instances against JSON Schema (Draft-07). Runs locally in your browser. No uploads.

  • Validate payloads with Ajv and get detailed errors.
  • Generate Draft-07 schemas from example JSON.
  • No network calls: data stays in your browser.

Use cases

Validate JSON Against a Schema

Explore more in the Use cases library.

Actions & Options

Schema Settings

JSON instance

JSON Schema

Results

How to use JSON Schema Validator

Paste a JSON Schema (draft-07 or later) into the schema editor and a JSON document into the data editor, then click Validate. The tool uses AJV to run full validation and reports every error with the specific path and message.

Common use cases

Backend developers use this to verify that API request and response payloads conform to their OpenAPI schemas. QA engineers use it to test edge cases in data validation rules, and data teams use it to validate pipeline outputs against agreed-upon schemas.

Why run this in your browser?

All processing happens locally in your browser. Your data never leaves your machine, making it safe for sensitive payloads, internal API responses, and confidential configurations.