JSON Formatter & Beautifier
About JSON Viewer
Paste messy or minified JSON and get clean, indented, readable output in one click — or minify it back down to a single line. Everything runs in your browser; nothing is uploaded.
A JSON formatter (also called a beautifier or pretty-printer) rewrites JSON with consistent indentation and line breaks so it is easy to scan and diff. ToolsNest also checks the syntax as it formats, so malformed JSON is caught immediately with the line and column of the problem.
Need the opposite? The same tool minifies JSON — stripping every space and newline — which is handy for request bodies, environment variables, or anywhere size matters.
What you can use it for
- Beautify a minified API response so you can read it.
- Reformat a config file with consistent 2-space indentation before committing.
- Minify JSON to paste into an environment variable or query string.
- Spot a syntax error that is breaking your parser.
How it works, step by step
- 1
Paste your JSON
Drop minified or badly-indented JSON into the editor, or load a .json file from your device.
- 2
Click Format
The JSON is pretty-printed with clean indentation. Invalid JSON is flagged with its line and column.
- 3
Or minify it
Choose Remove white space to compress the JSON to a single line.
- 4
Copy the output
Copy the formatted or minified result — your data never leaves the browser.
Frequently asked questions
How do I format JSON online for free?
Paste your JSON and click Format. It is pretty-printed instantly with proper indentation, at no cost and with no sign-up.
What does beautifying JSON do?
It adds indentation and line breaks so the structure is easy to read, without changing any of the data.
Can I minify JSON here too?
Yes. Use Remove white space to strip all spaces and newlines and get the smallest possible valid JSON.
Is my data private?
Yes — formatting happens entirely in your browser. Nothing is uploaded or stored.