JSON Formatter
Format (beautify), validate and minify JSON in your browser. Pretty-print messy JSON, catch syntax errors, or compress it — your data never leaves your device.
🔒 Runs 100% in your browser — nothing is uploaded
About the JSON formatter
Paste messy or minified JSON to beautify it with clean indentation, or minify it down to a single compact line. The tool also validates your JSON and shows a clear error message if the syntax is wrong. Because it runs entirely in your browser, it's safe for sensitive data such as API responses, access tokens and configuration — nothing is ever uploaded.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting and validation happen entirely in your browser, so you can safely paste sensitive payloads, tokens or API responses.
What does "minify" do?
Minify removes all unnecessary whitespace to produce the smallest valid JSON on a single line — useful for config values or reducing payload size.
How do I know my JSON is valid?
If the JSON is invalid, the tool shows the parser error message instead of output, pointing you to the problem.