Why Use Our JSON Formatter?
Working with JSON is part of every developer's daily life — whether you're debugging an API response, reading a config file, or cleaning up data from a third-party service. Our formatter makes this effortless.
🎨 Format (Beautify)
Takes minified or messy JSON and adds proper indentation, line breaks, and spacing. Output is human-readable and follows standard 2-space indentation. Perfect for:
- Making sense of a minified API response
- Cleaning up JSON config files
- Preparing JSON for documentation or code reviews
📦 Minify
Strips all whitespace, line breaks, and indentation to produce the smallest possible JSON string. Essential for:
- Reducing payload size in production APIs
- Storing JSON in localStorage or cookies
- Embedding JSON in HTML data attributes
✅ Validate
Checks whether your JSON is syntactically correct. If there's an error, it tells you the line number and the nature of the problem (missing comma, unclosed bracket, trailing comma, etc.).
How to Use the JSON Formatter
- Paste your JSON into the text area above. You can paste from an API response, a .json file, or any text source.
- Click "Format / Beautify" to add indentation and line breaks for readability.
- Or click "Minify" to compress the JSON into a single line with zero whitespace.
- Click "Validate" to check for syntax errors. If valid, you'll see a green confirmation. If not, the error message tells you exactly where the problem is.
- Copy the result with one click and paste it wherever you need it.
Common JSON Errors (and How to Fix Them)
- Missing comma: Between key-value pairs, you need a comma.
{ "a": 1 "b": 2 }→{ "a": 1, "b": 2 } - Trailing comma: JSON does not allow a comma after the last item.
[1, 2, 3,]→[1, 2, 3] - Single quotes: JSON requires double quotes for keys and string values.
{ 'name': 'John' }→{ "name": "John" } - Unquoted keys: Object keys must be strings.
{ name: "John" }→{ "name": "John" } - Comments: JSON does not support comments. Remove
//or/* */before formatting.
FAQ — JSON Formatter
Is there a size limit?
For best performance, stay under 1MB of JSON. The formatter runs in your browser, so very large files may slow down older devices. For files over 5MB, consider using a desktop tool like jq.
Does this tool store my JSON data?
No. All formatting happens locally in your browser using JavaScript. Your JSON never leaves your device and is never transmitted to our servers.
What indentation do you use?
Our formatter uses 2 spaces per indentation level, which is the most common convention in the JavaScript/JSON ecosystem. We do not currently support custom indentation settings, but may add this in the future.
Can I format JSON with arrays inside?
Yes. The formatter handles nested objects, arrays, mixed data types, and deeply nested structures without any issues.
Does it work with JSONP or NDJSON?
Pure JSON only. JSONP (JSON with a callback wrapper) and NDJSON (newline-delimited JSON) need to be unwrapped before formatting. We may add support for these formats in a future update.