{ } Developer utility

JSON Formatter

Paste JSON and make it readable instantly. No server uploads, lost large integers, or unnecessary clicks.

Your data stays in the browser Lossless formatting Only need compact JSON? Open the Minifier →

Input JSON Paste, type, or drop a .json file

0 characters

Result

Your result will appear here Paste JSON on the left or open the example.

A formatter you can trust with real data

Your JSON is processed entirely in the browser. Tokens are formatted without converting values, so long integers, exponent notation, array order, and duplicate keys are preserved literally.

Instant validation

Errors include the line, column, and nearby source. One click puts the cursor exactly where the parser stopped.

Code and tree

Switch between highlighted code and a collapsible structure. Click any key to copy its exact JSONPath.

File-friendly

Open JSON from disk or drag it into the editor, then download the clean result in one click.

Keyboard shortcuts ⌘/CtrlEnter Format ⌘/CtrlShiftM Minify ⌘/CtrlShiftC Copy result

A free JSON Formatter for formatting, minifying, validating, and exploring JSON online. Includes 2/4-space or Tab indentation, key sorting, search, tree view, and precise syntax diagnostics. Everything runs locally and no data is sent to a server.