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Koa and Express 4.0 are both fairly new, and from what I've read, Koa was made by the Express team.
From what I understand, Koa requires features of node that are only available in 0.11 (the unstable branch) of node, and also uses generators. Express 4.0 seems to only be the next version of the Express framework.
Are there any differences I am missing completely? Is it likely (based on what the Express team has publicly stated) that Koa and Express will merge at some point in the future?
Thanks!
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The key difference between Koa and Express is how they handle middleware. Express includes routing and templates in the application framework. Koa, on the other hand, requires modules for these features, therefore making it more modular or customizable.
Koa. js was created to be better than Express, therefore, it can do all that Express can do and more. From our performance test, we saw that Koa performs the best since it can handle more requests per second. This makes it a better choice for web applications and APIs that serve many clients at a time.
Fastify claims to be the fastest web framework around. Benchmarks back up their claim with Fastify performing nearly twice as fast as Express in a simple 'hello world' overhead benchmark. The only case where Fastify falls behind Express is in handling empty requests.
Pros of ExpressLesser Development Time: Express uses Javascript for both backend and frontend development. Thus, developers can generate codes faster without the need to learn a new language. Effective Error Handling: Express's middleware is built to support catching errors in both synchronous and asynchronous codes.
Search engines should be your first resort before posting open-ended questions.
From the Koa docs:
Koa vs Express
Philosophically, Koa aims to "fix and replace node", whereas Express "augments node". Koa uses co to rid apps of callback hell and simplify error handling. It exposes its own this.request and this.response objects instead of node's req and res objects.
Express, on the other hand, augments node's req and res objects with additional properties and methods and includes many other "framework" features, such as routing and templating, which Koa does not.
Thus, Koa can be viewed as an abstraction of node.js's http modules, where as Express is an application framework for node.js.
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Does Koa replace Express?
It's more like Connect, but a lot of the Express goodies were moved to the middleware level in Koa to help form a stronger foundation. This makes middleware more enjoyable and less error-prone to write, for the entire stack, not just the end application code.
Typically many middleware would re-implement similar features, or even worse incorrectly implement them, when features like signed cookie secrets among others are typically application-specific, not middleware specific.
...
Why isn't Koa just Express 4.0?
Koa is a pretty large departure from what people know about Express, the design is fundamentally much different, so the migration from Express 3.0 to this Express 4.0 would effectively mean rewriting the entire application, so we thought it would be more appropriate to create a new library.
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