JSON (JavaScript Object Notation) is the most widely used data format in modern web development — APIs, config files, database exports, and application settings all use JSON. Our free JSON formatter helps developers quickly clean up, validate and convert JSON without installing any tools.
What Our JSON Formatter Does
- Format / Beautify: Converts compact or malformed JSON into readable, properly indented code
- Validate: Checks if your JSON is syntactically valid and tells you exactly where the error is
- Minify: Removes all whitespace to produce compact JSON for production use or API payloads
- Real-time error highlighting: Invalid JSON shows the error immediately as you paste
- Indentation options: 2 spaces (standard), 4 spaces, or tab character
- File info: Shows line count and file size of formatted output
Common JSON Errors and How to Fix Them
- Trailing commas:
{"key": "value",}— remove the comma before the closing brace - Single quotes: JSON requires double quotes —
{'key'}should be{"key"} - Unquoted keys:
{key: "value"}— keys must be strings in double quotes - Undefined/NaN values: These are JavaScript values, not valid JSON — use
nullinstead - Comments: JSON does not support comments — remove any
//or/* */
{ }
Try it free — no sign-up needed
Use the Free JSON Formatter →Also useful for developers: Base64 Encoder/Decoder, URL Encoder/Decoder, and Markdown to HTML Converter.
