Question 1

How to add authentication to a Kemal app?

Accepted Answer

Kemal doesn't include built-in authentication, but you can use middleware like kemal-session or custom handlers. The official documentation provides examples for integrating OAuth or JWT with the context object.

Question 2

Kemal vs Sinatra for web development?

Accepted Answer

Kemal is similar to Sinatra in simplicity but is built for Crystal, offering better performance due to compiled code. However, Sinatra benefits from Ruby's larger ecosystem and community support.

Question 3

How to deploy a Kemal application in production?

Accepted Answer

Kemal apps can be compiled to native binaries using Crystal's compiler, then deployed with process managers like systemd or in containers. The README links to a guide with best practices for scalability.

Question 4

Does Kemal work with databases like PostgreSQL or MySQL?

Accepted Answer

Yes, but Kemal doesn't include an ORM. You need to use Crystal shards such as Granite or Jennifer for database operations and integrate them manually in your routes and middleware.

Question 5

What are the performance benchmarks for Kemal compared to Node.js frameworks?

Accepted Answer

Kemal leverages Crystal's speed, often outperforming Node.js frameworks in raw throughput and latency, as highlighted in community benchmarks. However, real-world results depend on application design and hosting.

Question 6

How to handle static files and SPA routing in Kemal?

Accepted Answer

Kemal has built-in static file serving for assets. For SPAs, serve the frontend files and use catch-all routes or middleware, as demonstrated in examples from the GitHub repository.

kemal

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