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en / tools / json-formatter
JSON formatter and validator
Paste some JSON, find out whether it is valid and where it breaks, with line and column when the browser gives them.
Free, in the browser, no account
Everything happens in your browser: no data is sent anywhere.
Paste some JSON to start.
How it works
- Paste your JSON into the box.
- If there is an error, the position appears as you type.
- Choose the indent and press Format, or Minify for a single line.
Why it exists
Because the error message from JSON.parse differs between browsers, and half the time it does not
say where. This tool tries to say it anyway, and admits it when it cannot.
How it finds the position
In degrading levels, in this order:
- the line and column stated by the engine (Firefox and recent V8 write them);
- the absolute offset, converted by counting newlines;
- the fragment quoted in the message, searched for in the text, but only if it is not truncated;
- nothing.
The fourth level matters as much as the other three. Unexpected end of JSON input has no
position, and Safari never gives one: inventing one would send you hunting for an error where
there is none, which is worse than not knowing.
About your data
Everything happens in your browser. This site is made of static files and has no server to send anything to, even if it wanted one.
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