When comparing Hapi vs Rocket, the Slant community recommends Rocket for most people. In the question“What are the best backend web frameworks?” Rocket is ranked 14th while Hapi is ranked 27th. The most important reason people chose Rocket is:
Rocket makes extensive use of Rust's code generation tools to provide a clean API.
Specs
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Pros
Pro Backed by a major corporation
Hapi was developed and is still being used by Walmart. Being backed by such a major company means that it will not lose support any time soon and most importantly it's being developed by professionals and that you will always get support for it.
Pro Consistency across applications
Hapi's philosophy is that configuration is more important than code. This is especially useful for very large teams because it helps developers maintain consistency and reusability throughout their code.
Pro Easy To Use
Rocket makes extensive use of Rust's code generation tools to provide a clean API.
Pro Streams
Rocket streams all incoming and outgoing data, so size isn't a concern.
Pro Cookies
View, add, or remove cookies, with or without encryption, without hassle.
Pro Testing Library
Unit test your applications with ease using the built-in testing library.
Pro Extensible
Easily create your own primitives that any Rocket application can use.
Pro Templating
Rocket makes rendering templates a breeze with built-in templating support.
Pro Query Strings
Handling query strings and parameters is type-safe and easy in Rocket.
Pro Type Safe
From request to response Rocket ensures that your types mean something.
Pro Boilerplate Free
Spend your time writing code that really matters, and let Rocket generate the rest.
Pro Config Environments
Configure your application your way for development, staging, and production.
Cons
Con Requires too much boilerplate
Hapi seems to be made with large applications in mind. The sheer amount of boilerplate code it requires is simply not practical for a small web app. This also means that there are few examples of Hapi applications around for beginners to learn from.
Con Abandoned
Con Nightly
Uses only nightly versions of Rust.