📋 JSON Formatter
Format, validate, and minify JSON data with syntax highlighting
Input
Output
Format, validate and minify JSON in your browser. Paste raw or minified JSON to pretty-print it with proper indentation, get a clear error message with the location if it is invalid, or strip whitespace to minify it for production — nothing you paste is sent to a server.
Frequently asked questions
How do I format (pretty-print) JSON?
Paste your JSON and click Format. It is re-indented with consistent spacing so nested objects and arrays are easy to read. If the input is not valid JSON, you get an error describing what went wrong instead.
How do I find the error in invalid JSON?
The validator reports the parse error, such as an unexpected character or a missing bracket. Common culprits are trailing commas, single quotes instead of double quotes, and unquoted keys — JSON is stricter than JavaScript object syntax.
What does minifying JSON do?
Minifying removes all unnecessary whitespace and line breaks, producing the smallest equivalent JSON. The data is unchanged — it is useful for reducing payload size in APIs and config files.
Is it safe to paste API responses or config files here?
Yes. Parsing and formatting happen entirely in your browser with JavaScript — the JSON is never uploaded, so it is safe for data containing tokens, keys or personal information.