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Paste a document and find out whether it parses — and if it doesn’t, precisely where. The check uses your browser’s own JSON parser, so “valid” here means what every other piece of software will agree it means.
Paste JSON above, or open a .json file.
Result
Nothing to check yet — paste some JSON on the left.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard or save it as a file. Close the tab and nothing of what you pasted remains.