Format, validate, and read JSON clearly
JSON is easy for machines to emit and hard for people to read once it arrives as one long line. This formatter takes compact or broken JSON and re-indents it so the structure — objects, arrays, and nesting — becomes obvious at a glance. If the text isn't valid JSON, it tells you where parsing failed instead of silently producing garbage, which is usually the fastest way to find a stray comma or an unquoted key.
How to use it
- Paste the JSON you got from an API response, a config file, or a log line.
- Choose Beautify to expand it with indentation, or Minify to strip whitespace for a compact payload.
- If there's a syntax error, read the position it reports and check the character just before it — a trailing comma or a single quote is the usual culprit.
- Copy the cleaned result back into your editor or request body.
When this is handy
- Inspecting an API response that your code rejected, to see what actually came back.
- Turning a minified
.jsonconfig into something you can edit by hand. - Shrinking a payload before sending it, when every byte counts.
- Confirming that generated JSON is well-formed before committing it.
Questions people ask
Does my data get uploaded? No. The parsing and formatting happen in your browser, so the JSON never leaves your device.
Why does valid-looking JSON fail? JSON is stricter than JavaScript: keys must be in double quotes, no trailing commas, and no comments. Those three rules catch most errors.
Can it handle very large files? It handles typical API responses comfortably. Extremely large files depend on your device's memory, since everything is processed locally.