JSON Formatter

Paste JSON, validate it, format or minify it

Indent 2 spaces 4 spaces Tab Sort keys

Input

Output

Formatted or minified JSON will appear here.

Waiting for input —

What this tool does

JSON Formatter checks whether a block of JSON is valid, then rewrites it either as neatly indented, readable text or as a compact single-line string. Everything happens locally in your browser — nothing you paste is sent anywhere.

How it works

1. Paste JSON — put your JSON text into the Input pane.
2. Format — validates the JSON and rewrites it with consistent indentation and line breaks in the Output pane. If something's wrong, the exact error and its position are shown instead.
3. Minify — validates the JSON and collapses it to the smallest possible single-line form, useful for pasting into configs or APIs.
4. Indent — choose 2 spaces, 4 spaces, or a tab for formatted output.
5. Sort keys — when checked, object keys are alphabetized in the output, which can make diffs easier to read.
6. Copy Output / Download .json — grab the result once it's valid.

Good to know

• Validation follows strict JSON rules — trailing commas, single quotes, and unquoted keys (all valid in JavaScript object literals) are flagged as errors here, since they aren't valid JSON.
• Sorting keys changes key order but never changes values, arrays stay in their original order.
• Very large JSON documents may take a moment to format — the tool processes everything in memory in your browser.