Valid object
json = {"status": "ok", "count": 3}
Result: Valid JSON · object (2 keys) · 27 characters
JSON Validator
Check whether a document is valid JSON. Valid documents are confirmed instantly with their type and size; invalid ones get a precise line/column error message that points straight at the problem. All processing happens in your browser.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Trailing comma
json = {"a": 1,}
Result: Invalid — Unexpected token } at position 9 (line 1, column 9)
Valid array
json = [1, 2, 3]
Result: Valid JSON · array (3 items)
Frequently asked questions
What counts as valid JSON?
JSON has a strict grammar: objects in {} with double-quoted keys, arrays in [], strings in double quotes, and numbers, booleans, null, or nested values. Comments, trailing commas, and single quotes are not valid JSON.
Is validation done on my machine?
Yes. The document is parsed locally by your browser and never sent to a server, so you can validate confidential configuration or payloads safely.
The error mentions a position — how do I read it?
The line and column count characters from the start of the input. The reported spot is where parsing failed, so check the character right before it: a stray comma, an unclosed brace, or a missing quote is usually the culprit.
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