JSON Formatter - Momo Toolbox
JSON Formatter
Format, minify and validate JSON data
JSON Formatter Tutorial
Paste JSON text into the input, click "Format" to beautify, "Minify" to compress, or "Validate" to check syntax.
View detailed tutorial →Loading tool...
JSON Formatter - Use Cases
The JSON formatter is useful for frontend/backend development, API debugging, config file editing, and data migration. Use it when you need to read minified JSON responses from APIs or validate the syntax of JSON you have written.
Features
- One-click format: beautify minified JSON with proper indentation
- One-click minify: remove whitespace for transmission and storage
- Syntax validation: real-time error detection with line numbers
- UTF-8 safe: correctly handles non-ASCII characters like Chinese
- Fully local: data never leaves your browser
FAQ
Will my data be uploaded to a server?
No. All JSON parsing and formatting happens locally in your browser. Data never leaves your device.
Why does my JSON throw "Unexpected token"?
The most common causes are single quotes, missing commas, trailing commas, or unescaped double quotes in strings. Click "Validate" to locate the exact position.
Does it support JSON5 or JSON with comments?
Not currently. This tool strictly follows the standard JSON spec (RFC 8259) and does not support comments or trailing commas.
Want more details? See the full JSON Formatter Tutorial