JSON Formatter
Format, validate and minify JSON with syntax highlighting.
How to Use the JSON Formatter
Paste your JSON into the input box, then click "Format" to beautify it with proper indentation, or "Minify" to compress it into a single line. Choose between 2-space or 4-space indentation.
What This Tool Does
- Format/Beautify — adds indentation and line breaks for readability
- Minify — removes all whitespace to reduce file size
- Validate — shows an error message if your JSON is invalid
The tool runs entirely in your browser using the built-in JSON.parse() and JSON.stringify() functions. No data is sent to any server.
Frequently Asked Questions
How do I validate JSON?
Paste your JSON and click Format. If the JSON is invalid, an error message will appear showing what went wrong and where.
What is the difference between Format and Minify?
Format adds indentation and line breaks to make JSON readable. Minify removes all unnecessary whitespace to create the smallest possible output.
Is there a size limit?
There is no hard limit, but very large JSON files (over 10MB) may be slow to process in the browser.
Does my JSON get uploaded?
No. All formatting happens locally in your browser. Your data never leaves your device.
More Developer Tools
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text.
Open tool →UUID Generator
Generate UUID v4 identifiers, single or in bulk.
Open tool →Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Open tool →URL Encode / Decode
Encode or decode URLs and query parameters.
Open tool →HTML Entity Encode / Decode
Encode special characters to HTML entities or decode them back.
Open tool →JWT Decoder
Decode and inspect JWT tokens — header, payload and claims.
Open tool →