JSON Validator

Validate JSON syntax in your browser. Paste any string to check if it is valid JSON. See the exact error and position when invalid.

JSON input

How to use

Paste your JSON
Enter or paste the text you want to validate in the text area.
Check result
The tool reports whether the input is valid JSON. If invalid, you'll see the error message.
Copy if valid
When valid, use the Copy button to copy the JSON.

Examples

Valid JSON
Valid input is confirmed.
Input
```
{"a":1,"b":2}
```
Output
```
Valid JSON.
```
Invalid JSON
Missing comma or quote shows an error.
Input
```
{"a":1 "b":2}
```
Output
```
Error message with details.
```

Frequently asked questions

Is my JSON sent to a server?: No. Validation runs entirely in your browser.
What counts as valid JSON?: Valid JSON must use double quotes for keys and strings, and follow standard JSON syntax (no trailing commas, etc.).

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