JSON Validator
Strict RFC 8259 JSON validation with precise error locations.
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A JSON validator confirms that a string is parseable as JSON — and if not, tells you exactly where the syntax breaks. Converterzilla's validator uses JSON.parse with a custom error walker to surface line and column info every time, so debugging configuration files is a matter of seconds, not detective work.
How to use JSON Validator in your browser
- Paste your JSON. Drop a .json file or paste it into the input panel.
- Read the verdict. ✓ Valid means it parses; otherwise the exact line/column appears.
- Copy the parsed shape. Valid JSON is also pretty-printed so you can inspect structure.
Why use Converterzilla for JSON Validator
Precise errors
We don't just say 'invalid' — we show the line and column.
No upload
Validation runs locally; your config never leaves the page.
Instant feedback
Live validation on every keystroke.
Frequently asked questions about JSON Validator
No — this is syntax validation only. For schema validation, see the JSON Schema page (roadmap).
Limited only by your browser's memory; >100 MB starts to lag on most laptops.
No — RFC 8259 disallows them. Several languages (JS, Python) allow them but JSON itself does not.