JSON Formatter & Validator
Paste your JSON below to format, minify, sort keys, or validate it.
About JSON Formatter & Validator
This free online tool lets you format (pretty-print), minify, sort keys, and validate JSON data instantly in your browser. No data is sent to any server — everything runs locally. Whether you are debugging an API response, cleaning up a configuration file, or verifying payload structures, this tool provides clear, readable output with detailed error messages when your JSON is invalid.
How to Use
- Paste or type your JSON into the input area on the left.
- Click Format to pretty-print with 2-space indentation, Minify to remove all whitespace, or Sort Keys to alphabetically order object keys.
- If the JSON is invalid, a detailed error message with line/position info will appear below.
- Click Copy to copy the output to your clipboard.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is commonly used for APIs, configuration files, and data storage.
What does “minify” mean?
Minifying JSON removes all unnecessary whitespace, newlines, and indentation to produce the most compact representation. This is useful for reducing payload size when transmitting data over a network or storing it efficiently.
How do I fix invalid JSON?
Common issues include missing or extra commas, unquoted keys, single quotes instead of double quotes, trailing commas after the last element, and unescaped special characters. The error message shown by this tool includes position information to help you locate exactly where the problem is in your input.