Developer Tools
Free Online JSON Formatter
Paste your JSON below to validate it and format it with proper indentation — or minify it into a single compact line.
How to use the jSON Formatter
- Paste your JSON data into the input box.
- Choose an indentation style (2 spaces, 4 spaces, or tabs).
- Click 'Format / Beautify' to pretty-print it, or 'Minify' to compress it to one line.
- If the JSON is invalid, an error message shows what to fix.
Example
Pasting {"name":"Alex","age":30} and clicking Format returns a readable, indented version with each key on its own line — making nested data far easier to read.
Why format JSON online?
API responses, config files, and logs are often delivered as compact, unreadable JSON. Formatting adds indentation and line breaks so you can actually read the structure, spot missing commas, or debug malformed data.
Validates as it formats
If your JSON has a syntax error, the tool tells you instead of silently failing, so you can quickly locate and fix the problem before using the data elsewhere.
Frequently asked questions
The tool displays an error message describing the problem, such as a missing comma or bracket, instead of producing output.
Format adds indentation and line breaks for readability; Minify removes all unnecessary whitespace to produce the smallest possible output.
No, all formatting and validation happens locally in your browser.
Yes, though extremely large payloads may take a moment to process depending on your device.