JSON formatter

JSON formatter and validator

Paste JSON to validate, format, minify, and copy it locally in your browser. The page does not upload, save, or log your input.

JSON input

All content is processed locally in your browser and is not sent to a server.

Ready for input

Format or minify JSON and the result will appear here.

Ctrl/Cmd + Enter to format, Ctrl/Cmd + Shift + M to minify

Uses native JSON.parse and shows browser error details with inferred line and column when possible.

Renders escaped tokens as text and spans so JSON strings cannot execute as HTML.

Formatting, minifying, and copying happen on the current page without backend calls.

Is JSON content sent to a server?

No. This is a frontend-only tool. Parsing, formatting, minifying, and highlighting all run locally in the browser.

Why is the error position sometimes approximate?

Browsers expose JSON.parse errors differently. The page uses the position when available and infers line and column from the input.

Can it handle long JSON output?

Yes. The result panel has a stable height, horizontal scrolling, and long-token wrapping so mobile layouts do not overflow.