Fastify End of Life - Dates and Lifecycle
Fastify is a fast, low-overhead Node.js web framework focused on performance and developer experience, part of the OpenJS Foundation.
Last updated 8 August 2026
5
Versions tracked
4
At EOL
1
Supported
All versions
| Version | Released | LTS | Latest |
|---|---|---|---|
|
5.0.0
|
17 Sep 2024 |
Active
|
5.8.5
14 Apr 2026
|
|
4.0.0
|
08 Jun 2022 |
30 Jun 2025
Ended 1 year, 1 month ago
|
— |
|
3.0.0
|
07 Jul 2020 |
30 Jun 2023
Ended 3 years, 1 month ago
|
— |
|
2.0.0
|
25 Feb 2019 |
31 Jan 2021
Ended 5 years, 6 months ago
|
— |
|
1.0.0
|
06 Mar 2018 |
01 Sep 2019
Ended 6 years, 11 months ago
|
— |
About Fastify
Fastify has processed over 7.8 million downloads a month since its 1.0 release in 2018, and maintains an ecosystem of nearly 300 officially recognized plugins as part of the OpenJS Foundation. It's a fast, low-overhead Node.js web framework built around performance and a strong developer experience.
Fastify Lifecycle Explained
Fastify publishes a formal LTS policy: each major version gets a minimum of six months of full support from release, followed by an additional six months of security-only updates after the next major version ships. After that combined LTS window closes, Fastify's maintainers may still review community-submitted security fixes on a best-effort basis, though nothing is guaranteed. The current 5.x line sees regular security patching in practice, with four separate CVEs fixed within it in early 2026 alone.
Each major Fastify release is only tested and verified against the latest release of each supported Node.js line, so running an older patch within a given Node.js major version isn't guaranteed to be covered even if that Node.js line is otherwise still within its own support window.
Node.js Compatibility by Fastify Version
| Fastify Version | Node.js Versions Tested | N|Solid |
|---|---|---|
| 5.0.0 | 20, 22 | v5 (20) |
| 4.0.0 | 14, 16, 18, 20, 22 | v5 (18), v5 (20) |
| 3.0.0 | 10, 12, 14, 16, 18 | v5 (18) |
| 2.0.0 | 6, 8, 10, 12, 14 | N/A |
| 1.0.0 | 6, 8, 9, 10, 11 | N/A |
Frequently Asked Questions
What is the latest version of Fastify?
Fastify 5.x is the current major version and is presently in its LTS window.
When was Fastify released?
Fastify reached its first stable 1.0.0 release in March 2018, following earlier pre-1.0 development.
Is Fastify a backend?
Yes, it's a server-side Node.js framework for building APIs and web applications, not a frontend tool.
Is Fastify better than Express?
They serve similar purposes but with different priorities. Fastify was built with performance and low overhead as core design goals from the start, while Express prioritizes simplicity and its long-established middleware ecosystem. Which is "better" depends on whether raw throughput or ecosystem maturity matters more for a given project.