Validate JSON syntax instantly
JSON Tools
JSON Validator Online
Validate JSON syntax before sending an API request, saving config, or sharing a payload. See parser errors without uploading your data.
- Runs in your browser
- No account required
- Copy-ready output
Show a clear success state for valid JSON
Display parsing errors for invalid JSON
Keep validation focused without rewriting your input
Notes
How this tool handles your input
This JSON validator checks whether a value can be parsed as strict JSON. It is useful before you send a request body, save a config file, or format a payload copied from logs.
How to use
- Paste the JSON you want to check.
- Click Validate JSON.
- Read the success message or error details.
- Clear the editor when you want to test another payload.
Good for
- Check request payloads before sending them
- Find syntax problems in copied JSON
- Confirm config files are valid JSON
Examples
Input
{"status":"ok","count":3,"tags":["api","tools","json"]}
Output
Valid JSON. The input can be parsed successfully.
Input
{
"status": "ok",
}
Output
Invalid JSON. Remove the comma before the closing brace.FAQ
What does valid JSON mean?
Valid JSON follows the JSON specification: quoted object keys, allowed value types, no trailing commas, and balanced brackets.
Will this auto-fix invalid JSON?
No. This validator intentionally reports syntax status without modifying your original input.
Does the error show where the JSON broke?
When the browser parser reports a character offset, the tool converts it into an approximate line and column.
Is my data uploaded to a server?
No. The tool runs in your browser, so the text you paste stays on your device.