Compare TypeScript files with type annotation, interface, and generic syntax highlighting
TypeScript diffs benefit from understanding that type annotations, interfaces, and generic parameters are distinct from runtime logic. A standard text diff treats `user: User` and `user: Admin` as a trivial string swap, but QuickKit's TypeScript diff checker highlights type changes as first-class modifications. It handles `.ts` and `.tsx` files equally, recognizes decorator syntax, optional chaining, and nullish coalescing — all the patterns that define modern TypeScript codebases. When reviewing a PR that adds strict null checks or upgrades a type from `any` to a proper interface, you need a tool that understands TypeScript's semantics, not just its characters.
Paste your original TypeScript code in the left panel
Paste the modified TypeScript code in the right panel
Click Compare — type changes, interface modifications, and logic differences are highlighted with full TS syntax coloring
Full TypeScript syntax highlighting in both panels
Type annotation and interface change detection
Generic parameter comparison
Decorator and metadata syntax support
TSX/React component comparison mode
Reviewing type changes in pull requests
Comparing interface definitions across versions
Auditing type strictness migrations (any → specific types)
Reviewing tsconfig.json schema changes
Comparing React component props types