JSON Schema Validator

Validate JSON data against JSON Schema

Schema

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Data

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JSON Schema Validator

Validate JSON data against JSON Schema instantly with our powerful, browser-based validator. Designed with developers and API engineers in mind, this tool delivers lightning-fast validation, detailed error reporting, and 100% client-side processing to keep your data secure. Whether you're validating API responses, configuration files, or data structures, the validator handles everything smoothly without slowing down your machine.
Built on the same high-performance core as our industry-leading JSON and XML formatters, the JSON Schema Validator ensures precise validation, real-time error detection, and comprehensive compliance checking. It's perfect for validating API contracts, ensuring data integrity, testing schema compliance, or debugging validation issues.
With support for JSON Schema Draft 7, copy/paste input, file uploads, and instant validation results, this JSON Schema Validator becomes an essential part of any developer's workflow. No installations, no backend requests, no data tracking—just fast, secure, and reliable JSON Schema validation right from your browser.
Optimize your productivity with a clean UI, blazing performance, and robust validation capabilities—built to handle even the most complex schemas with ease.

Key capabilities

  • Schema validation: Validate JSON data against JSON Schema Draft 7 with comprehensive error reporting and detailed messages.
  • Dual input: Separate editors for JSON Schema and JSON data, making it easy to test multiple data sets against the same schema.
  • Error details: Get detailed validation errors with paths, messages, and suggestions for fixing issues.
  • File support: Upload schema and data files directly, or paste JSON from your clipboard.

Privacy & reliability

Just like our other formatters, the JSON Schema Validator experience is completely local—no uploads, no external APIs, no telemetry. Your schemas and data never leave your machine, making it safe for sensitive configurations, private API contracts, or confidential data.

Robust validation provides clear, actionable error messages so you can quickly identify and fix schema compliance issues.

Quick how-to

  1. Enter your JSON Schema in the Schema editor (left side).
  2. Enter the JSON data to validate in the Data editor (right side).
  3. Click Validate to check if the data conforms to the schema.
  4. Review validation results and fix any errors shown.