Web Design & Dev
JSON Formatter & Validator
Paste JSON to format it readably, minify it, or find exactly where it is broken.
Runs entirely in your browser — nothing you enter is sent or stored.
How it works
Parsing uses the browser's strict JSON.parse, so trailing commas, single quotes and comments are reported as errors — just as an API would reject them. The line and column of the first error are shown.
Frequently asked questions
Is my JSON sent to a server?
No. It is parsed in your browser, which makes the tool safe for API keys and private data.
Why is my trailing comma an error?
The JSON standard does not allow trailing commas, even though JavaScript does.