JSON Validator
Validate JSON syntax instantly and locate errors with exact line and column numbers. Free online JSON checker for develo
Validation result will appear here...
How to Use JSON Validator
- Paste your JSON: Paste the JSON you want to check into the input box.
- Click Validate: Press the Validate JSON button. Valid JSON shows its root type and key count.
- Fix errors: Invalid JSON shows the error with exact line and column numbers — fix the problem and validate again.
About JSON Validator
JSON Validator checks whether your input is syntactically correct JSON and pinpoints any errors precisely.
- Exact Error Location: Invalid JSON shows the error message with exact line and column numbers.
- Structure Info: Valid JSON shows the root type (object, array or scalar) and top-level key/item count.
- Character Count: See the total characters of your input for quick size checks.
Ideal for debugging broken configs, testing API responses and catching typos before they reach production.
Frequently Asked Questions
How does the JSON Validator work?
It parses your input with a strict JSON parser. Valid JSON shows the root data type and key count; invalid JSON shows the exact error with line and column numbers.
Common reasons JSON fails validation?
Missing commas between properties, trailing commas, unquoted keys, single quotes instead of double quotes, and duplicate keys are the most common mistakes.
Can it validate large JSON files?
Yes. The tool handles large documents easily since parsing runs entirely in your browser.