JavaScript Validator

Validate JavaScript code with support for popular libraries like React, jQuery, Moment.js, and more. Get detailed error reports and discover which libraries your code uses.

JavaScript Code Input

JavaScript Validation Tips

Supported Libraries

• React: Components, hooks, JSX syntax

• jQuery: DOM manipulation, AJAX, animations

• Moment.js: Date parsing and formatting

• Lodash: Utility functions and helpers

• D3.js: Data visualization and SVG

• Express.js: Node.js web framework

• Vue.js: Progressive framework patterns

Validation Features

• Syntax error detection and line reporting

• Best practice warnings and suggestions

• Deprecated API usage detection

• Library pattern recognition

• Real-time validation as you type

Common Issues Detected

• Use of var instead of let/const

• Loose equality == vs strict ===

• Deprecated methods like document.write

• Missing semicolons and syntax errors

• Undefined variables and references

Library Detection

• Confidence scoring based on pattern matches

• Detailed library information and features

• Links to official documentation

• Detection works even with syntax errors

• Multiple libraries can be detected in one file