JSON Formatter & Validator
Paste any raw or minified JSON and instantly validate it, see the exact error if invalid, and get a clean pretty-printed or minified output.
How to Use the JSON Formatter & Validator
Paste your JSON
Drop raw API response, minified JSON, or any JSON string into the left panel.
Format or Minify
Click Format for pretty-printed output or Minify to collapse it into one line.
Copy the result
The output appears on the right. Click Copy to put it on your clipboard.
What Is the JSON Formatter & Validator?
JSON (JavaScript Object Notation) is the dominant data format for APIs and configuration files. Raw JSON from APIs is often minified into a single line, making it impossible to read. Handwritten JSON is easy to break with a missing comma or mismatched bracket. This tool parses your JSON, reports the exact line and character of any syntax error, and outputs a correctly indented, human-readable version on success.
Frequently Asked Questions
The tool shows the exact error message from the JSON parser, including a description of what went wrong, so you can fix it quickly.
Two spaces per level, which is the most common standard for readability.
Yes. The tool handles any valid JSON value: objects, arrays, strings, numbers, booleans, and null.
No. All processing happens in your browser using the native JSON.parse API. Nothing is transmitted.