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JSON Formatter

Format, beautify, minify, and validate JSON instantly. Catch syntax errors with line numbers. Runs in your browser.

Next step
Convert to YAML.JSON YAML ConverterHave CSV data? Convert it.CSV to JSON

APIs return minified JSON, log files contain deeply nested objects, and config files grow unreadable over time. A quick formatter and validator lets you spot structure issues, find missing commas, and understand data shapes without firing up a full IDE.

Developer ToolsBrowser-basedOpen full guide

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Help and details

How to use

  1. Paste raw JSON into the input area.
  2. Click Format to pretty - print or Minify to compact the JSON.
  3. Check the validation indicator for syntax errors and line numbers.
  4. Copy the formatted result to your clipboard.

Privacy and processing

All processing happens in your browser. Your JSON data is never sent to our servers.

Frequently Asked Questions

What does this tool do?
It formats (pretty - prints) JSON with proper indentation, minifies JSON by removing whitespace, and validates JSON syntax with error messages and line numbers.
Is my JSON uploaded to a server?
No. All formatting, minifying, and validation happen entirely in your browser. Nothing is sent to any server.
Can it fix broken JSON?
No. The tool reports syntax errors with line numbers so you can fix them yourself, but it does not auto - correct invalid JSON.
What indent sizes are supported?
You can choose between 2 - space and 4 - space indentation.
Is there a size limit?
There is no hard limit, but very large JSON files may slow down your browser since processing happens client - side.
Does it preserve key order?
Yes. JSON.parse and JSON.stringify in modern browsers preserve insertion order of object keys.
Why do I see an error with a line number?
The JSON has a syntax error near that line. Common causes include missing commas, unclosed brackets, trailing commas, or unquoted keys.
Does this work offline?
Yes. Once the page has loaded, formatting and validation run without any network requests.