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JavaScript vs TypeScript

Comparing JavaScript Source File and TypeScript Source File - which format should you use?

	JavaScript	TypeScript
Full Name	JavaScript Source File	TypeScript Source File
Extension	.js	.ts
MIME Type	application/javascript	application/typescript
Category	data	data

JavaScript Pros

+Runs in every web browser
+Huge ecosystem (npm has 2M+ packages)
+Can be used for frontend and backend
+Dynamic and flexible

JavaScript Cons

-Dynamic typing can cause bugs
-Browser inconsistencies
-Security risks if not handled properly
-Can be slow for CPU-intensive tasks

TypeScript Pros

+Catches errors at compile time
+Better IDE support (autocomplete, refactoring)
+Makes large codebases manageable
+100% compatible with JavaScript

TypeScript Cons

-Requires compilation step
-Learning curve for type system
-Can add verbosity
-Build configuration complexity

Use JavaScript when...

-Web application frontend code
-Node.js server-side applications
-Browser extensions
-Mobile apps (React Native)
-Automation scripts

Use TypeScript when...

-Large-scale web applications
-API development
-React/Angular/Vue applications
-Library and framework development

Learn more about JavaScript Learn more about TypeScript