JSON Formatter
Format, beautify, and minify your JSON data instantly in your browser.
Features
- Instant Formatting: Paste your raw JSON and format it with a single click.
- Minification: Compress your JSON payloads to save bandwidth.
- Syntax Validation: Instantly catch syntax errors like missing commas or quotes.
- Privacy First: All JSON parsing happens via WebAssembly or native JavaScript within your own browser. Nothing is ever sent to our servers.
- VS Code Experience: Powered by Monaco Editor, providing the exact same editing experience as Visual Studio Code.
How it works
Simply paste your unformatted or minified JSON into the left editor pane. Click "Format" to beautify the code with proper indentation (2 spaces), or click "Minify" to strip out all unnecessary whitespace. If your JSON contains syntax errors, an error message will highlight the problem, preventing the format from completing until it is fixed.
Frequently Asked Questions
Everything you need to know about DevToolkit.
Does my JSON data leave my computer?
No. The JSON Formatter uses the browser's native JSON.parse() and JSON.stringify() methods. Your data never touches a network request.
What is the maximum file size?
Since it runs locally, the maximum size is only limited by your browser's memory. However, for files larger than 10MB, you might experience slight UI stuttering.
How do I fix 'Invalid JSON' errors?
Common issues include trailing commas (which are not allowed in strict JSON), missing double quotes around keys, or using single quotes instead of double quotes.