JSON Validator

Paste your JSON below

Paste your JSON Schema below or generate one from your JSON
Supported schema type: Standard JSON Schema Draft-07.
Need to format, minify, generate a schema, or repair your JSON? Try our other free tools!

Free, fast, privacy-friendly JSON validator, fixer, and schema checker for everyone.

Instantly validate your JSON online. Enjoy a beautiful, VS Code-inspired editor with line numbers and syntax highlighting. If your JSON is invalid, our tool will not only show you the error and where it happened, but also suggest an auto-repaired version you can use instantly. Validate your JSON against a custom JSON Schema and see detailed error messages. You can also generate a JSON Schema from your data with one click. Free, fast, privacy-friendly JSON validator, fixer, and schema checker for everyone.

What is a JSON Validator?

A JSON Validator checks if your JSON data is valid and error-free. Our tool goes further: it features a modern, VS Code-like editor with line numbers and syntax highlighting, making it easy to spot and fix issues. If your JSON is broken, we automatically suggest a repaired version using advanced algorithms, so you can copy and use it right away. You can also validate your JSON against a custom JSON Schema and get detailed error feedback.

Why use this Online JSON Validator?

Our tool is more than just a basic JSON checker. It provides a modern, developer-friendly experience with instant error feedback, VS Code-like editing, automatic repair suggestions, and JSON Schema validation—making it the best choice for anyone working with JSON.

  • Instantly validate JSON with a beautiful, developer-friendly interface.
  • See error messages and locations when you validate your JSON.
  • Get an auto-repaired JSON suggestion for most common mistakes.
  • Validate your JSON against a custom JSON Schema and see detailed error messages.
  • Syntax highlighting and line numbers for easy editing and debugging.
  • Works on any device, privacy-friendly, no data stored or sent to a server.

Common Use Cases

Whether you're a developer, student, or data analyst, this tool helps you quickly validate, debug, repair, and check JSON against schemas for a variety of real-world scenarios:

  • Debugging API responses and requests with instant error location and repair.
  • Fixing and formatting configuration files for readability and correctness.
  • Learning and teaching JSON syntax and schema validation with a real code editor experience.
  • Checking and repairing JSON before importing/exporting data.

Security & Privacy

Your JSON data never leaves your browser. All validation, repair, and schema checking happens locally, ensuring your data is private and secure. No data is sent to any server.

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