JSON Formatter
Format, minify, and validate JSON in your browser. Paste JSON, pretty-print with 2-space indent, or compress to one line. Free, no signup.
Processed locally in your browser.
How to use this json formatter
Paste JSON into the editor. Click Format to pretty-print, Minify to pack it onto one line, or Validate to check syntax without changing layout.
Copy the result or Clear the editor. Parse errors show in place so you can fix a trailing comma or missing brace without a round trip to a server.
Example
{"name":"Ada","ok":true} formats to a two-line object with indented keys. Minify reverses that to a single line.
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Frequently asked questions
How do I format JSON?
Paste the JSON and click Format. The tool pretty-prints with two-space indentation using JSON.parse and JSON.stringify.
How do I minify JSON?
Click Minify. Whitespace that is not inside strings is removed.
Does this validate JSON too?
Yes. Format and Minify only succeed on valid JSON. Use JSON Validator if you want an error-focused view.
Is my JSON uploaded?
Processed locally in your browser. We do not upload the text to compute a result.
Why is my JSON invalid?
Common causes are trailing commas, single quotes, comments, and unquoted keys. Strict JSON does not allow those.
Last reviewed 2026-08-19. Results stay on your device unless you copy them elsewhere.