JSON Validator
Checks JSON syntax and tells you exactly where it broke — no vague "invalid JSON" with nothing to act on.
Sponsor
Tool 02 — parse → validate
Idle
Input0 chars
Local only. Validation runs in your browser. Nothing you paste — including config, tokens or customer data — is sent anywhere.
Examples
{"ok":true}→Valid JSON{"a":1,}→Invalid — trailing comma{'a':1}→Invalid — single quotes not allowedFAQ
How do I validate JSON?
Paste it into the input panel. The status line updates automatically to show valid, or an error with the exact line and column.
How do I validate a JSON file?
Open the file in a text editor, copy the contents, and paste them here. There's no file upload — validation runs on the pasted text, locally.
Does this support JSON Schema validation?
Not yet — this checks syntax only. Schema validation is planned as a second mode; for now it's tracked as a backlog item.
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