How to Format JSON Online
Format, validate, and beautify JSON instantly in your browser. Free JSON formatter with syntax highlighting, error detection, and minification.
Open JSON Formatter →Step-by-Step Guide
Paste your JSON
Copy your raw JSON data and paste it into the input area. The tool accepts any valid JSON — objects, arrays, nested structures, or API responses.
Click Format
Hit the "Format" button. The formatter validates your JSON, adds proper indentation (2 or 4 spaces), and applies syntax highlighting so you can read it easily.
Fix errors if needed
If your JSON has syntax errors (missing commas, unquoted keys, trailing commas), the tool highlights the exact line and character position so you can fix it quickly.
Copy or minify
Copy the formatted result to your clipboard, or switch to "Minify" mode to compress it for production use. Everything runs locally — your data never leaves your browser.
Try It Now — Free
No signup, no download. Runs entirely in your browser.
Open JSON Formatter