Developer Tools•Free & Browser-Based
JSON Validator
Validate JSON syntax in real time, locate parsing errors with exact line and column numbers, and view detailed diagnostics.
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What is the Free Online JSON Validator?
The JSON Validator checks whether a given text string strictly adheres to the ECMA-404 JSON Data Interchange Standard, catching missing brackets, illegal characters, and syntax violations.
100% Client-Side Privacy: Calculations and data processing occur entirely in your local browser memory. Zero files or personal inputs are uploaded to our servers.
How to Use JSON Validator Online: Step-by-Step Guide
- 1Enter or paste the JSON text in the validation area.
- 2Click "Validate JSON".
- 3If valid, see green confirmation and data statistics (key counts, depth). If invalid, inspect the highlighted line and error message.
Pro Tips for Getting Accurate Results
- •Comments (`//` or `/* */`) are not allowed in pure JSON specifications.
- •Watch out for smart/curly quotes pasted from rich text apps like Microsoft Word.
Frequently Asked Questions About JSON Validator
This error occurs when the parser encounters a character that violates JSON syntax rules, such as an unescaped newline, missing colon, or trailing comma.
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