JSON Validator
Paste JSON to check it instantly. Invalid JSON shows the error message with the line and column where parsing failed; valid JSON can be formatted, minified, and explored in a tree view.
How to use the JSON Validator tool
- Paste your JSON into the JSON input box.
- Read the status: invalid JSON shows the error with its line and column.
- Fix the problem and click Format & validate to pretty-print the JSON.
- Copy or download the formatted output.
Frequently asked questions
What are the most common JSON errors?
Trailing commas, single quotes instead of double quotes, unquoted property names, and missing commas between items.
Does the validator follow the JSON standard strictly?
Yes. It uses the browser's built-in JSON parser, which follows the JSON standard (RFC 8259). Comments and trailing commas are reported as errors.
Can I validate large files?
Yes. Large documents are parsed directly in your browser; very large files depend on your device's memory.
Private by design
Everything runs in your browser. The text you paste is not uploaded, stored, or logged by AblePro.
Need more options? Open the full JSON Studio.