JSON Formatter

Beautify and pretty-print JSON with consistent indentation — offline.

Your data is processed entirely in your browser and is never uploaded.

INPUT JSON

Drag & drop file here or browse

awaiting input

Paste your data, drop a file above, or load the sample — it never leaves this tab.

local sandbox · 0 bytes uploaded

Example:
{"id":1,"name":"Ada","roles":["admin"]}

JSON Status: Empty0 chars

Options

Indentation

Sort object keys (A→Z)

Produces deterministic output; array order is preserved.

FORMATTED OUTPUT

no output yet

Run the tool — your result appears right here, processed fully offline.

local sandbox · 0 bytes uploaded

Formatted JSON will appear here...

Output: Empty0 chars

HOW IT WORKS

Format JSON in three steps

Paste or upload

Drop in raw, minified, or messy JSON — up to 15M characters.

Pick indentation

Choose 2 spaces, 4 spaces, or tabs, and optionally sort keys A→Z.

Format & export

Click Format, then copy or download the beautified result — all offline.

FAQ

Frequently asked questions

Is my JSON uploaded anywhere?

No. Formatting happens entirely in your browser. Your data never leaves your machine.

What does "sort keys" do?

It reorders every object's properties alphabetically for deterministic output — handy for diffing. Array element order is always preserved.

Can it validate JSON too?

Yes — if the input isn't valid JSON, the status bar shows the parse error with its position. A dedicated JSON Validator with richer diagnostics ships in v1.2.