Compare JavaScript files with ES6+ syntax awareness and JSX support
JavaScript's flexible syntax — arrow functions, destructuring, template literals, optional chaining — means functionally equivalent code can look very different textually. QuickKit's JS diff checker understands modern ES6+ patterns and highlights meaningful logic changes rather than syntactic sugar differences.
Paste your original JavaScript code in the left panel
Paste the modified version in the right panel
Click Compare — ES6+ syntax is recognized and highlighted correctly
ES6+ syntax awareness
JSX/TSX component diffing
Import statement grouping
Async/await pattern recognition
Module vs CommonJS detection
Reviewing React component changes in PRs
Comparing bundle output between builds
Auditing npm package updates
Debugging transpiler output differences
Comparing Express route handlers