JSON Validator and Formatter

To format and validate your JSON, just copy + paste it below or

About the JSON Validator

JSON Validator is a validator and reformatter for JSON, a lightweight data-interchange format. Copy and paste, directly type, or input a file in the editor above and let the validator tidy and validate your JSON code.

JSON (pronounced as Jason), stands for "JavaScript Object Notation," is a human-readable and compact solution to represent a complex data structure and facilitate data interchange between systems.

How to Validate JSON Online

  1. Paste your JSON into the input box above or upload a file from your computer.
  2. Click the "Validate JSON" button to check for errors.
  3. See if your JSON is valid or get clear feedback on what needs fixing.
  4. Use the "Compress" button to minify your JSON for faster performance.
  5. Copy your validated JSON back into your project.

Frequently Asked Questions

What does a JSON Validator do?

This JSON Validator tool will check your JSON for mistakes like missing brackets, extra commas, or incorrect characters.

Is this JSON Validator also a linter?

Yes! It works just like a JSON linter. It scans your JSON, highlights mistakes, and formats the output so you can use it right away without issues.

Can this tool handle large JSON files?

Yes! Just upload your file or paste your json in input, and the validator will process it regardless of its size. This tool supports large JSON files.

Is it safe to use this online?

Absolutely. Everything runs directly in your browser. Your JSON isn't stored or sent anywhere—it stays on your device.

Can I allow comments or single quotes in my JSON?

Standard JSON doesn't support comments or single quotes, but our validator lets you enable those options if you work with slightly looser formats.

Does the JSON Validator format the code, too?

Yes. When you validate your JSON, it automatically formats the output, making it easier to read and debug.