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Express.js
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Express.js
Core details
Title
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Description
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Express.js is a minimal Node.js web framework providing routing, middleware, and HTTP utilities for building APIs and servers with unopinionated flexibility. It's the backbone for many MEAN/MERN stacks.
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Usage & Trade-offs
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When to use it
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Use Express when: - Creating RESTful APIs quickly. - Needing lightweight server setup. - Extending with middleware ecosystem. - Prototyping Node-based backends.
Pros
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- Simple and fast for basic routing. - Huge middleware library (helmet, cors). - Mature, stable, and well-documented. - Easy integration with databases/ORMs. - Low learning curve for JS devs.
Cons
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- Lacks structure for large apps (use NestJS). - Callback hell without async/await. - Security requires manual middleware. - Performance lags behind Go/Rust alternatives. - No built-in support for WebSockets.
Notes
Note: Use express-rate-limit for API protection. Structure with routers for modularity. Validate inputs with express-validator.
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