Online JSON Formatter & Validator

Use this free tool to beautify messy JSON text, fix indentation and check whether your JSON is valid. All parsing runs locally in your browser. Your JSON content will never be sent to any external server. No login required.

How To Use

  1. Paste your compressed or messy JSON code into the text box.
  2. Click the Format JSON button to beautify and validate it.
  3. If valid, the formatted JSON will show in the box. If invalid, you will get an error hint.
  4. Copy the result with the copy button for your development work.

What is JSON?

JSON stands for JavaScript Object Notation. It is a lightweight text format widely used for data exchange between APIs, websites and applications. Raw JSON responses from APIs are often minified into one single line, which is hard for humans to read. This formatter adds indentation and line breaks so you can inspect the structure easily.

FAQ

Will my JSON data be saved?

No. Everything is processed inside your browser. We do not collect, store or transmit your JSON data.

What if my JSON shows an error?

The error message tells you where the syntax mistake is. Common issues include missing commas, missing quotes or mismatched brackets.

Who uses this JSON formatter?

Developers, API testers, front-end engineers and SEO specialists often use JSON tools to debug API responses.

Can I use this tool offline?

Yes. Once this page loads, formatting works without an internet connection.