# Fastify vs Koa

**Leader by vioscaleAI score:** Fastify

| Attribute | Fastify | Koa |
|---|---|---|
| **vioscaleAI score** | 70 (78% (high)) | 52.3 (66% (medium)) |
| activity.commits_last_30d | 20 | 2 |
| adoption.dependent_repos | 16,712 | 109,950 |
| adoption.github_stars | 37,232 | 35,677 |
| content.faq | `[{"answer":"A Node.js web framework optimized to handle high request volumes with minimal overhead, featuring a plugin system, JSON Schema validation, and native TypeScript support. It is indexed under Web Frameworks.","source":"https://fastify.dev","question":"What is Fastify?","confidence":0.6},{"answer":"Fastify is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.","source":"https://fastify.dev","question":"Is Fastify free to use?","confidence":0.6},{"answer":"Fastify supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://fastify.dev","question":"What platforms does Fastify support?","confidence":0.6},{"answer":"Yes. Fastify can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://fastify.dev","question":"Can Fastify be self-hosted?","confidence":0.6},{"answer":"We have confirmed 26 integrations for Fastify, including Next.js, Apollo Server, Angular, PostgreSQL, MongoDB, Redis, Elasticsearch and Swagger/OpenAPI, plus 18 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://fastify.dev","question":"What does Fastify integrate with?","confidence":0.6},{"answer":"Yes. Fastify is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/fastify/fastify","question":"Is Fastify open source?","confidence":0.95}]` | - |
| deployment.options | `{"cloud":true}` | - |
| description.long | A Node.js web framework emphasizing fast request handling and low resource consumption while maintaining strong security, input validation, and developer experience. | A library that uses SHA1 HMAC to sign and verify data (like cookies or URLs) by maintaining a rotating system of secret keys. Old keys can be removed and new ones added without invalidating existing client credentials. |
| features.capabilities | `{"language":"JavaScript/TypeScript","api_first":true,"api_routes":true,"async_model":"event-loop-async","file_routing":true,"cli_scaffolding":true,"openapi_autogen":true,"language_runtime":"JS/TS","typescript_first":true,"websocket_support":true,"dependency_injection":true}` | `{"language":"JavaScript","api_routes":true}` |
| integrations.count | 28 | - |
| integrations.list | `[{"name":"Next.js"},{"name":"Apollo Server"},{"name":"Angular"},{"name":"PostgreSQL"},{"name":"MongoDB"},{"name":"Redis"},{"name":"Elasticsearch"},{"name":"Swagger/OpenAPI"},{"name":"WebSocket"},{"name":"JWT"},{"name":"Helmet"},{"name":"Sentry"},{"name":"RabbitMQ"},{"name":"CORS"},{"name":"CSRF"},{"name":"OAuth2"},{"name":"Kubernetes"},{"name":"Firebase","native":false,"category":"auth"},{"name":"Mongoose","native":false,"category":"database"},{"name":"TypeORM","native":false,"category":"database"},{"name":"OAuth","native":false,"category":"auth"},{"name":"GraphQL","native":false,"category":"api"},{"name":"Swagger","native":false,"category":"documentation"},{"name":"OpenAPI","native":false,"category":"documentation"},{"name":"React","native":false,"category":"frontend"},{"name":"Vue","native":false,"category":"frontend"},{"name":"GCP Cloud Storage","native":false,"category":"storage"},{"name":"Casbin","native":false,"category":"authorization"},{"name":"ObjctionJS","native":false,"category":"database"},{"name":"AWS Lambda","native":false,"category":"cloud","direction":"outbound"},{"name":"Svelte","native":false,"category":"frontend","direction":"outbound"},{"name":"AMQP","native":false,"category":"messaging","direction":"bidirectional"},{"name":"Express","native":false,"category":"framework","direction":"outbound"},{"name":"Koa","native":false,"category":"framework","direction":"outbound"},{"name":"Hapi","native":false,"category":"framework","direction":"outbound"},{"name":"Nuxt","native":false,"category":"framework","direction":"outbound"},{"name":"Stoplight Elements","native":false,"category":"documentation","direction":"outbound"},{"name":"Server-Sent Events","native":false,"category":"protocol","direction":"outbound"},{"name":"TypeBox","native":true,"category":"library","direction":"outbound"},{"name":"Valkey","native":false,"category":"caching","direction":"outbound"}]` | - |
| language.primary | JavaScript | JavaScript |
| license.spdx | MIT | MIT |
| platform.support | `{"cli":true,"web":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://fastify.dev","retrievedAt":"2026-09-07T13:15:46.651Z"}` | - |
| pricing.free_tier | yes | - |
| pricing.model | commercial | commercial |
| pricing.price_level | free | - |
| release.cadence_days | 4 | 16 |
| release.history | `[{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.4","date":"2026-09-17T07:53:08Z","type":"prerelease","version":"v6.0.0-alpha.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.5","date":"2026-09-16T10:19:43Z","type":"stable","version":"v5.12.5"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.4","date":"2026-09-11T09:19:29Z","type":"stable","version":"v5.12.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.3","date":"2026-09-04T09:21:10Z","type":"prerelease","version":"v6.0.0-alpha.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.2","date":"2026-09-04T08:20:39Z","type":"stable","version":"v5.12.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.2","date":"2026-08-19T01:54:36Z","type":"prerelease","version":"v6.0.0-alpha.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.1","date":"2026-08-18T19:51:41Z","type":"stable","version":"v5.12.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.1","date":"2026-08-13T15:57:10Z","type":"prerelease","version":"v6.0.0-alpha.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.0","date":"2026-08-13T15:55:21Z","type":"stable","version":"v5.12.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.0","date":"2026-08-11T08:32:37Z","type":"prerelease","version":"v6.0.0-alpha.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.3","date":"2026-08-08T06:55:46Z","type":"stable","version":"v5.11.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.2","date":"2026-08-03T08:21:47Z","type":"stable","version":"v5.11.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.1","date":"2026-08-03T08:10:10Z","type":"stable","version":"v5.11.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.0","date":"2026-07-30T09:32:16Z","type":"stable","version":"v5.11.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.10.0","date":"2026-07-05T09:37:06Z","type":"stable","version":"v5.10.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.9.0","date":"2026-06-28T08:21:36Z","type":"stable","version":"v5.9.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.5","date":"2026-04-14T12:09:02Z","type":"stable","version":"v5.8.5"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.4","date":"2026-03-23T10:31:20Z","type":"stable","version":"v5.8.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.3","date":"2026-03-23T10:20:21Z","type":"stable","version":"v5.8.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.2","date":"2026-03-07T09:42:46Z","type":"stable","version":"v5.8.2"}]` | `[{"url":"https://github.com/koajs/koa/releases/tag/v3.2.1","date":"2026-05-21T07:26:16Z","type":"stable","version":"v3.2.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.2.0","date":"2026-03-28T05:41:00Z","type":"stable","version":"v3.2.0"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.2","date":"2026-02-25T13:37:14Z","type":"stable","version":"v3.1.2"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.4","date":"2026-02-25T13:38:28Z","type":"stable","version":"v2.16.4"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.1","date":"2025-10-27T04:27:58Z","type":"stable","version":"v3.1.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.0","date":"2025-10-26T13:17:47Z","type":"stable","version":"v3.1.0"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.3","date":"2025-10-18T14:22:52Z","type":"stable","version":"v3.0.3"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.3","date":"2025-10-18T14:36:52Z","type":"stable","version":"v2.16.3"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.2","date":"2025-10-17T06:56:28Z","type":"stable","version":"v3.0.2"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.2","date":"2025-07-30T00:02:36Z","type":"stable","version":"v2.16.2"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.1","date":"2025-07-27T07:38:40Z","type":"stable","version":"v3.0.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.0","date":"2025-04-28T00:40:12Z","type":"stable","version":"v3.0.0"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.5","date":"2025-04-06T21:43:50Z","type":"stable","version":"3.0.0-alpha.5"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.1","date":"2025-04-06T21:41:44Z","type":"stable","version":"v2.16.1"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.4","date":"2025-03-21T07:37:11Z","type":"prerelease","version":"3.0.0-alpha.4"},{"url":"https://github.com/koajs/koa/releases/tag/2.16.0","date":"2025-02-27T05:56:03Z","type":"stable","version":"2.16.0"},{"url":"https://github.com/koajs/koa/releases/tag/2.15.4","date":"2025-02-12T14:12:11Z","type":"stable","version":"2.15.4"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.2","date":"2024-11-04T05:10:02Z","type":"prerelease","version":"3.0.0-alpha.2"}]` |
| reliability.status_page | - | yes |
| security.scorecard | 8.3 | 5.8 |
| security.vulnerabilities | `{"count":17,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=fastify&per_page=100","last_12m":12,"max_severity":"HIGH"}` | `{"count":6,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=koa&per_page=100","last_12m":2,"max_severity":"CRITICAL"}` |

## Capabilities (Web Frameworks)

| Capability | Fastify | Koa |
|---|:--:|:--:|
| **Core** |  |  |
| Rendering model | - | - |
| File-based routing | ✓ | - |
| Language | JavaScript/TypeScript | JavaScript |
| **Rendering** |  |  |
| Server components | - | - |
| Streaming SSR | - | - |
| **Fullstack** |  |  |
| Built-in API / backend routes | ✓ | ✓ |
| **DX** |  |  |
| First-class TypeScript | ✓ | - |
| Fast refresh / HMR | - | - |
| **Deployment** |  |  |
| Edge runtime support | - | - |

*Source: vioscaleAI. Generated 2026-10-16T20:58:07.888Z. "-" = undocumented, not absent.*