JSON Validator
Validate JSON and find syntax errors with line numbers.
Processing runs locally in your browser. Toolexa does not upload or permanently store your input.
About JSON Validator
JSON Validator is a focused browser tool for checking whether JSON text is valid before you paste it into code, an API client, a database field or a configuration file. Add your JSON payload to the editor and click Validate JSON. The tool parses it locally, confirms valid JSON when the structure is correct, and reports syntax problems when parsing fails. It also estimates the error line from the parser position when available, helping you jump to the likely issue faster. This is especially helpful for missing commas, trailing commas, unquoted keys, unmatched braces, broken arrays and copied API responses that look correct at first glance. Toolexa does not upload or permanently store your input; validation happens in the browser using JavaScript. The result summary is copyable, and Clear resets the page for another payload. JSON Validator is intentionally simple, making it a good quick check for developers, QA testers, students, support teams and anyone who needs confidence that a JSON snippet is safe to use.
How to use JSON Validator?
- Paste JSON into the input editor.
- Click Validate JSON.
- Read the validation status and line number if an error is found.
- Copy the result summary if needed.
- Use Clear before checking another JSON snippet.
- Open the tool page and read the input labels carefully.
JSON Validator Features
- Validate JSON syntax locally
- Highlight validation errors in the result panel
- Show approximate error line number
- Display valid JSON summary
- Copy validation result
- Clear input and result quickly
JSON Validator FAQs
What does JSON Validator check?
It checks whether the input can be parsed as valid JSON.
Does it show the exact error line?
It shows an approximate line number when the browser parser provides an error position.
Can it fix JSON automatically?
No, this tool validates and reports errors; use JSON Formatter after fixing syntax.
Are trailing commas allowed?
No, standard JSON does not allow trailing commas.
Is the JSON stored by Toolexa?
No, validation runs locally and the page does not permanently store your input.