JSON Formatter
Beautify, minify and validate JSON with error positions.
Private by design. This tool runs entirely in your browser. Your input is processed on your own device and is not uploaded by DO101.
About the JSON Formatter
Paste raw JSON and get readable, indented output — or minify it back down for shipping. Invalid JSON is reported with the line and column of the problem instead of a vague parse error.
How to use it
- 1Paste your JSON.
- 2Choose an indent size, or press minify.
- 3Copy or download the formatted result.
What you get
- 2, 4 and tab indentation
- Minify to the smallest valid JSON
- Precise error line and column
- Sort keys alphabetically
- Copy or download in one tap
Frequently asked questions
Why does my JSON fail to parse?
The usual culprits are trailing commas, single quotes instead of double quotes, unquoted keys and comments. JSON allows none of those — DO101 points at the exact character that broke the parse.
Is my JSON sent to a server?
No. Parsing uses the browser's built-in JSON engine, so payloads with API keys or customer data never leave your machine.
Can it handle large files?
Files up to a few megabytes format instantly. Enormous documents may be slow to render because of the browser, not the parser.
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