Side-by-side NPM package comparison
Version 5.8.2
Fast and low overhead web framework, for Node.js
Version 0.0.1
web framework
Choosing between Fastify and Nestjs? Here's a data-driven comparison based on real npm data — downloads, bundle size, health scores, and more — to help you decide which package fits your project best.
Fastify leads with 5.6M weekly downloads — roughly 335.7x more. Nestjs has 16.7K weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.
Nestjs has the smallest gzipped bundle at 0 B. Fastify comes in at 83.1 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.
Fastify has an overall health score of 85/100 (very good), with strong maintenance, security, popularity scores. Nestjs has an overall health score of 53/100 (moderate), with strong security scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.
Choose Fastify if you value large community support, actively maintained, strong security track record. Choose Nestjs if you value strong security track record.
Both Fastify and Nestjs are solid choices for JavaScript development. Fastify has the edge in overall health score (85/100), while each package brings unique strengths to the table. Evaluate them based on your project's priorities — whether that's community size, bundle efficiency, or maintenance activity — and choose the one that aligns best with your requirements.