Prettify JSON Online
Format, beautify, and validate JSON instantly in your browser. Choose your indent style or minify for production. Everything runs client-side.
How the formatter works
Three steps from raw JSON to clean, readable output.
Paste your JSON
Paste any raw JSON into the input field. It can be minified, partially formatted, or even malformed. The tool shows you exactly what is wrong if it cannot parse.
Choose indent style
Select 2-space, 4-space, or tab indentation. Toggle Minify to remove all whitespace for production use. The choice persists across sessions.
Copy or download
Copy the formatted output to your clipboard in one click, or download it as a .json file. Stats show the key count and line count at a glance.
Why use this JSON formatter?
Fast, private, and works exactly the way you expect.
Instant in-browser formatting
Formatting happens entirely in your browser using the native JSON.parse and JSON.stringify APIs. There is zero latency, zero server round trips, and zero data sent anywhere.
Detailed validation errors
If your JSON is invalid, the tool surfaces the exact SyntaxError message from the JavaScript engine so you can pinpoint the problem immediately.
Three indent modes
2-space indentation is the JavaScript community standard. 4-space is common in Python and Java. Tab indentation is preferred in some style guides and accessibility tools.
One-click minify
Minify removes all optional whitespace to produce the smallest possible JSON string, ideal for embedding in production configs or reducing payload size in APIs.
Frequently asked questions
Everything you need to know about prettifying and validating JSON.
