Online JSON Formatter & Validator

Clean up, beautify, and validate your JSON data to make it readable and easy to debug.

Powerful, Simple, and Secure

Instant Formatting

Transform messy, single-line JSON into a neatly indented, human-readable format with a single click.

Error Highlighting

Quickly find syntax errors. Our validator points out exactly what's wrong, saving you valuable debugging time.

100% Private

Your data never leaves your machine. All processing happens locally in your browser, ensuring complete confidentiality.

What is JSON and Why Format It?

JSON (JavaScript Object Notation) is the standard format for data exchange on the web. It's used everywhere, from APIs and configuration files to web storage. While computers can read JSON in any form, it's often delivered as a compact, single line of text, which is nearly impossible for humans to read.

Formatting (or "pretty-printing") your JSON adds line breaks and indentation, organizing the data into a logical, nested structure. This makes it dramatically easier to:

  • Read and Understand Data: Quickly grasp the structure of an API response or a configuration file.
  • Debug Errors: Easily spot missing commas, mismatched brackets, or other common syntax errors.
  • Present Information: Share JSON data with colleagues in a clean, professional format.

Frequently Asked Questions

Is my data safe with this tool?

Yes, your data is 100% safe. This tool performs all formatting and validation directly in your browser using JavaScript. Your JSON data is never sent to our servers, ensuring complete privacy and security.

What does 'validating' JSON mean?

Validation is the process of checking if your JSON data adheres to the correct syntax rules. This includes checking for things like matching curly braces , matching square brackets [], correct use of commas, and properly quoted keys and string values. Our tool validates your JSON automatically when you click the format button.

Can this tool handle large JSON files?

Yes, the tool is designed to handle large JSON files efficiently. Since all processing is done on your local machine, performance will depend on your computer's processing power and available memory. For the vast majority of use cases, it will be instantaneous.

Your Privacy is Our Priority

This tool runs entirely in your browser. We do not upload, store, or analyze your data. Everything you process stays on your device. Period.