JSON Formatter
Paste minified or messy JSON and get a clean, indented version instantly. Everything runs locally in your browser.
The JSON Formatter takes minified, poorly indented, or plainly unformatted JSON and returns a clean, indented version that's easy to read — right in your browser, without sending the content to any server.
Your files are processed locally in your browser and are not uploaded.
How to use JSON Formatter
- 1
Paste your JSON
Into the input field.
- 2
Click "Format JSON"
- 3
Copy the result
Already formatted and ready to use.
Why format minified JSON?
Minified JSON (no spaces or line breaks) is common in API responses and compacted configuration files — efficient to transmit, but nearly unreadable to review by hand. Formatting re-indents the structure, making the hierarchy of objects and arrays visible.
What happens if the JSON has a syntax error?
The tool tries to parse the JSON as given; if there's a syntax error — a stray comma, an unclosed brace — that's reported, instead of trying to format something invalid as if it were fine.
When should you use this tool?
Developers
Review an API response before integrating it.
Debugging
Quickly understand the structure of a complex payload.
Documentation
Prepare a readable JSON example for a README or document.
Configuration
Review a minified JSON config file before editing it.
Frequently asked questions
- Is my JSON uploaded anywhere?
- No. Formatting happens entirely in your browser using native JavaScript.