{"slug":"nestjs-vs-fastify","title":"NestJS vs Fastify","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","faqCount":5,"faqs":[{"question":"Can NestJS use Fastify instead of Express?","answer":"Yes. NestJS is adapter-agnostic and can use Fastify as its HTTP platform via @nestjs/platform-fastify. This combines NestJS's architecture benefits with Fastify's performance (achieving ~25,000-30,000 req/s). Install with: npm install @nestjs/platform-fastify, then create your app with NestFactory.create(AppModule, new FastifyAdapter())."},{"question":"Which should I choose for a microservice?","answer":"Fastify is typically better for microservices due to lower latency, faster startup, and minimal dependencies. However, if your microservice requires complex validation, authentication, or integrates deeply with databases, NestJS with Fastify adapter provides a good middle ground. For simple request/response services, Fastify wins on operational efficiency."},{"question":"How much faster is Fastify really in production?","answer":"In standardized benchmarks (TechEmpower Round 21), Fastify achieves ~40,000 req/s while NestJS with Express reaches ~15,000 req/s. However, real-world gains depend on application logic; if your code spends 90% of time in database queries, the framework overhead matters less. For I/O-heavy APIs, the difference shrinks to 10-20%."},{"question":"Is NestJS overkill for simple APIs?","answer":"For simple CRUD APIs with 1-2 endpoints, yes—Fastify or Express are better choices. NestJS shines when you have 20+ endpoints, complex business logic, or multi-tenant requirements where its structure prevents chaos. If your API needs validation, guards, interceptors, and role-based access control, NestJS saves significant boilerplate."},{"question":"Which has better documentation?","answer":"NestJS has more comprehensive documentation (official guides covering 90+ topics), a larger community for answers, and more third-party tutorials. Fastify's docs are concise and accurate but less extensive. For learning, NestJS is easier; for reference, both are solid but NestJS has more examples."}],"faqPageSchema":{"@context":"https://schema.org","@type":"FAQPage","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#faq","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","inLanguage":"en-US","name":"NestJS vs Fastify — FAQ","description":"Frequently asked questions about NestJS vs Fastify","dateModified":"2026-06-24T14:46:02.187Z","author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"publisher":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"isPartOf":{"@type":"Article","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#article"},"license":"https://creativecommons.org/licenses/by/4.0/","speakable":{"@type":"SpeakableSpecification","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#faq-speakable","cssSelector":[".faq-answer"]},"mainEntity":[{"@type":"Question","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#q1","name":"Can NestJS use Fastify instead of Express?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#a1","text":"Yes. NestJS is adapter-agnostic and can use Fastify as its HTTP platform via @nestjs/platform-fastify. This combines NestJS's architecture benefits with Fastify's performance (achieving ~25,000-30,000 req/s). Install with: npm install @nestjs/platform-fastify, then create your app with NestFactory.create(AppModule, new FastifyAdapter()).","inLanguage":"en-US","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#q2","name":"Which should I choose for a microservice?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#a2","text":"Fastify is typically better for microservices due to lower latency, faster startup, and minimal dependencies. However, if your microservice requires complex validation, authentication, or integrates deeply with databases, NestJS with Fastify adapter provides a good middle ground. For simple request/response services, Fastify wins on operational efficiency.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#q3","name":"How much faster is Fastify really in production?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#a3","text":"In standardized benchmarks (TechEmpower Round 21), Fastify achieves ~40,000 req/s while NestJS with Express reaches ~15,000 req/s. However, real-world gains depend on application logic; if your code spends 90% of time in database queries, the framework overhead matters less. For I/O-heavy APIs, the difference shrinks to 10-20%.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#q4","name":"Is NestJS overkill for simple APIs?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#a4","text":"For simple CRUD APIs with 1-2 endpoints, yes—Fastify or Express are better choices. NestJS shines when you have 20+ endpoints, complex business logic, or multi-tenant requirements where its structure prevents chaos. If your API needs validation, guards, interceptors, and role-based access control, NestJS saves significant boilerplate.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#q5","name":"Which has better documentation?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/nestjs-vs-fastify#a5","text":"NestJS has more comprehensive documentation (official guides covering 90+ topics), a larger community for answers, and more third-party tutorials. Fastify's docs are concise and accurate but less extensive. For learning, NestJS is easier; for reference, both are solid but NestJS has more examples.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/nestjs-vs-fastify","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}}]}}