JSON 校验器
检查 JSON 是否有效。
Paste JSON to check whether it is valid. Errors show the message plus the line and column where parsing failed. Everything runs locally in your browser.
工作原理
- 1 Paste or type your JSON.
- 2 The result updates live — valid or the error location.
- 3 Fix the reported line and column if needed.
常见用例
- Catch a stray comma or missing bracket.
- Validate an API response.
- Check config files before deploying.
- Confirm JSON before importing it.
常见问题
Is my input sent to a server?
No. Everything runs locally in your browser — your input is never uploaded, stored or logged.
Does it show where the error is?
Yes — when the browser reports a position, the tool converts it to a line and column number.
What counts as valid?
Strict JSON: double-quoted keys, no trailing commas, no comments.
Is it really free?
Yes — free, with no signup and no limits.