Question 1

How does Fastify compare to Express for real-world APIs?

Accepted Answer

Fastify outperforms Express in benchmarks, serving more requests per second, but Express has a larger ecosystem and simpler middleware setup. For performance-critical apps, Fastify is better; for rapid development with many pre-built modules, Express might suffice.

Question 2

How to set up JSON Schema validation in Fastify?

Accepted Answer

Define a schema object with properties like 'body' or 'params' and pass it to route handlers; Fastify compiles it into efficient validation functions. Check the documentation for examples on validation and serialization to ensure correct implementation.

Question 3

Is Fastify good for building microservices?

Accepted Answer

Yes, its low overhead and high performance make it ideal for microservices where scalability and speed are key. The plugin architecture also supports modular service design, but ensure team familiarity with its schema-based approach.

Question 4

What are common pitfalls when migrating from Express to Fastify?

Accepted Answer

Adapting Express middleware to Fastify plugins can be tricky due to different lifecycle hooks. Also, schema validation adds complexity, so plan for incremental migration and testing to avoid disruptions.

Question 5

Fastify vs Koa: which is faster and why?

Accepted Answer

Fastify generally outperforms Koa in benchmarks due to its optimized core and schema compilation. Koa is more minimal and flexible, but Fastify's built-in features like validation and logging give it an edge in structured applications.

Question 6

How to handle authentication in Fastify?

Accepted Answer

Use plugins like '@fastify/jwt' or custom hooks to manage authentication; the ecosystem provides options, but you may need to write more code compared to Express's middleware-based solutions. Refer to community plugins for best practices.

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