JSON Formatter & Validator
Developer
Paste raw or messy JSON and instantly format it with your preferred indentation, sort keys alphabetically, or minify it down to a single line. Everything runs locally in your browser, so your data never leaves your device.
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Output
How to use
- Paste or type your JSON into the input area.
- Choose an indentation size and, optionally, sort keys alphabetically.
- Click Format to beautify, or Minify to compact the JSON.
- If the JSON is invalid, the error message points to the problem.
- Copy the formatted result with the Copy button.
Frequently asked questions
- Is my JSON sent to a server?
- No. All formatting and validation happens locally in your browser — nothing is uploaded.
- What does sorting keys do?
- It reorders every object's keys alphabetically, recursively, which makes diffs and comparisons easier.
- Why do I get a syntax error?
- The input isn't valid JSON. Common causes are trailing commas, single quotes, or unquoted keys.
- Does minify change my data?
- No. Minify only removes whitespace; the data and key order stay the same unless you also enable sorting.
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