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JavaScript Validator
CodeParse JavaScript or Flow syntax and report syntax failures with readable editor diagnostics.
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Tool guide
JavaScript Validator: How to use this tool
Open the guide when you need step-by-step help or a sample. The live workspace stays first.
Guide and examples
How to use this tool
Load Data
Enter JAVASCRIPT in the workspace or use the available Load Data options.
Check JavaScript Syntax
Run Check JavaScript Syntax. Adjust the available settings first when needed.
Review: Errors
Review Errors. Resolve any reported errors before using the result.
Copy, download, or continue
Continue with Copy, Download, Share.
Example to try
Example input: JAVASCRIPT
export function formatPayload(payload) {
return JSON.stringify(payload, null, 2);
}Result in the live workspace
Run Check JavaScript Syntax in the live workspace above to generate the result. Review it in Errors.
Go to the live workspace- Expected input
- JAVASCRIPT
- Available actions
- Check JavaScript Syntax, Copy, Download, Share, Clear
- Result views
- Errors
- Conversion targets
- Not applicable
Learn more
Helpful context
Setup notes, privacy details, and examples when needed.
Validation uses Babel-compatible parsing with a Flow fallback. It checks syntax, not runtime behavior, types, or external imports.
Code
FAQ
Common questions about JavaScript Validator
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