JSON Validator

JSON Validator checks whether a JSON string is syntactically valid and reports the exact location of any errors. It also shows the structure — object count, array count, key count — so you get a quick overview of what the data contains.

Invalid JSON from a misconfigured API or a manual edit will cause hard-to-diagnose errors downstream. Validating at the source catches the issue immediately, before it propagates.

Tip: Common JSON errors include trailing commas after the last item, single-quoted strings (JSON requires double quotes), and unescaped control characters in string values — the validator will point to the exact line.