TypeScript Diff Checker — Compare TS Code Online
Paste two TypeScript files and instantly see every added type, removed interface, and changed generic. Syntax highlighting for .ts and .tsx. No account. No limits.
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Compare TypeScript file versions
Paste two versions of a .ts or .tsx file to see exactly what changed. Great for reviewing type refactors, auditing major version upgrades, comparing interface evolution, and spotting breaking changes before shipping.
Review TypeScript pull requests
Copy the old and new versions of a TypeScript module or component from your editor or GitHub. The diff highlights added methods, removed types, and changed signatures with character-level precision — faster than scanning a full file diff manually.
TypeScript syntax highlighting
Unlike plain text diff tools, DiffCheck applies TypeScript syntax coloring on top of the diff highlighting. Type annotations, interfaces, generics, enums, and decorators are color-coded — making it much easier to parse complex TypeScript diffs, especially in heavily typed codebases with deep generic chains.
Audit type definition changes
Paste two versions of a .d.ts declaration file to see which types, interfaces, or exported signatures changed. Indispensable when upgrading a typed library — spot breaking type changes before your TypeScript compiler does.
Privacy-first — runs in your browser
TypeScript source often contains business logic, internal API types, and proprietary data models. DiffCheck never sends your code to any server. All comparison runs locally in JavaScript — safe for internal codebases, unreleased features, and confidential type definitions.
Works for React and JSX too
Select TypeScript in the language dropdown to compare .tsx React component files. Props interfaces, component return types, generic component parameters, and JSX are all highlighted correctly — making component API changes easy to spot at a glance.
How to compare TypeScript code online
- 1
Paste your original TypeScript
Put the first version of your TypeScript file or module in the left editor — this is your baseline. Works with any TypeScript: plain .ts, .tsx React components, declaration files, or type-only modules.
- 2
Paste your modified TypeScript
Put the updated version in the right editor. This is what you're comparing against — a refactored class, an updated component, a new version of a type, or a patched module.
- 3
Read the diff
Green lines were added; red lines were removed. Within changed lines, the exact characters that differ are highlighted more intensely. TypeScript is selected by default for syntax coloring.
- 4
Switch views as needed
Use side-by-side to review both TypeScript files in parallel columns, or switch to inline view for a compact unified diff. The statistics bar shows total lines added, removed, and unchanged.
Frequently asked questions
What is a TypeScript diff checker?
A TypeScript diff checker compares two TypeScript files or code snippets and highlights the differences — added type definitions, removed interfaces, changed generics, and modified function signatures. It's essential for code review, auditing type changes, and comparing .ts and .tsx file versions.
Is this TypeScript diff tool free?
Yes, completely free with no rate limits and no signup. All TypeScript comparison runs in your browser — your code never leaves your device.
Does it support .tsx files?
Yes. Paste .tsx code directly into the editor — JSX syntax, React component types, and TypeScript annotations are all syntax-highlighted correctly on top of the diff colors.
Is my TypeScript code safe to paste here?
Yes. All diff computation runs locally in your browser using JavaScript. Your TypeScript code is never sent to any server, never stored, and never logged. Safe to use with proprietary type definitions, internal API clients, and sensitive application code.
Can I compare TypeScript declaration files (.d.ts)?
Absolutely. Paste two versions of a .d.ts file to see exactly which types, interfaces, or function signatures changed between library versions. This is especially useful when auditing a major version upgrade of a typed dependency.
How is TypeScript diff different from JavaScript diff?
TypeScript syntax highlighting adds color-coding for type annotations, interface declarations, generics, and type assertions on top of the standard diff highlighting. This makes TypeScript-specific changes — like a widened union type or a new required property — immediately stand out in the diff.