TypeScript Best Practices for 2025

TypeScript has become the industry standard for large-scale JavaScript applications. Here are some best practices to keep your code clean and safe.

Strict Mode

Always enable strict mode in your tsconfig.json. This enables a wide range of type checking behavior that results in stronger guarantees of program correctness.

Use Interfaces for Objects

Interfaces are generally preferred over types for defining object shapes because they can be extended and merged.

Avoid any

The any type defeats the purpose of using TypeScript. Use unknown if you don't know the type, or be specific.