JSON Formatter & Validator
About this Tool
The JSON Formatter helps you validate and beautify your JSON data. It makes convoluted, single-line JSON readable by formatting it into a well-structured, indented tree, solving the issue of debugging minified or malformed JSON in development.
How does it work? It parses the input with JSON.parse(), catches errors for validation, and uses JSON.stringify() with indentation for pretty-printing.
- Paste your raw JSON data into the input text area.
- Click the "Format / Validate" button.
- If the JSON is valid, it will be formatted and displayed in the output area. A success message will appear.
- If the JSON is invalid, an error message will describe the issue.
- Debugging API responses in console logs.
- Formatting config files for readability.
- Validating user-submitted JSON in forms.
- Pretty-prints minified or unformatted JSON.
- Validates JSON syntax and provides clear error messages.
- Monospaced font for easy reading and analysis.
JSON (JavaScript Object Notation) is a data interchange format based on JS objects. Formatting involves tree traversal to add whitespace, making nested structures visible. Validation ensures compliance with JSON rules like quoted keys.
Can it handle large JSON?
Yes, but browser memory limits apply.
Does it sort keys?
No, it preserves original order.
What if there's a syntax error?
It shows the line and description.
All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.