JSON Validator
Check whether JSON is valid and see exactly where it breaks.
How it works
- 1Paste your JSON.
- 2It is checked as you type.
- 3Fix the error at the reported line and column.
Features
- Line and column for every error.
- Formatted copy of valid JSON.
- Handles large documents.
- Private: runs in your browser.
Frequently asked questions
What makes JSON invalid?
Trailing commas, single quotes, unquoted keys, comments and missing commas are the most common causes.
Is JSON5 or JSONC accepted?
No. This checks strict JSON as defined by RFC 8259, which is what APIs expect.
Is my data sent anywhere?
No. Everything runs in your browser; nothing is uploaded.
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