Skip to Content
You are viewing a beta version of Clerk Docs
Visit the latest docs
Clerk logo

Clerk Docs

Ctrl + K
Go to clerk.com

Upgrading @clerk/fastify to Core 2

Core 2 is included in the Fastify SDK starting with version 1. This release ships with a variety of smaller DX improvements and housekeeping items. Each of the potentially breaking changes are detailed in this guide, below.

By the end of this guide, you’ll have successfully upgraded your Fastify project to use @clerk/fastify v5. You’ll learn how to update your dependencies, resolve breaking changes, and find deprecations. Step-by-step instructions will lead you through the process.

Preparing to upgrade

Before uprading, it's highly recommended that you update your Clerk SDKs to the latest Core 1 version (npm i @clerk/fastify@0). Some changes required for Core 2 SDKs can be applied incrementally to the v1 release, which should contribute to a smoother upgrading experience. After updating, look out for deprecation messages in your terminal and browser console. By resolving these deprecations you'll be able to skip many breaking changes from Core 2.

Note that Core 2 is currently in beta, while we field feedback and ensure stability. Deploying beta versions to production is not recommended and should be done at your own risk.

Additionally, some of the minumum version requirements for some base dependencies have been updated such that versions that are no longer supported or are at end-of-life are no longer guaranteed to work correctly with Clerk.

Updating Node.js

You need to have Node.js 18.17.0 or later installed. Last year, Node.js 16 entered EOL (End of life) status, so support for this version has been removed across Clerk SDKs. You can check your Node.js version by running node -v in your terminal. Learn more about how to update and install Node.js(opens in a new tab).

Updating to Core 2 Beta

Whenever you feel ready, go ahead and install the latest beta version of any Clerk SDKs you are using. Make sure that you are prepared to patch some breaking changes before your app will work properly, however. The commands below demonstrate how to install the latest beta.

terminal
npm install @clerk/fastify@beta
terminal
yarn add @clerk/fastify@beta
terminal
pnpm add @clerk/fastify@beta

CLI upgrade helper

Clerk now provides a @clerk/upgrade CLI tool that you can use to ease the upgrade process. The tool will scan your codebase and produce a list of changes you'll need to apply to your project. It should catch the vast majority of the changes needed for a successful upgrade to any SDK including Core 2. This can save you a lot of time reading through changes that don't apply to your project.

To run the CLI tool, navigate to your project and run it in the terminal:

terminal
npx @clerk/upgrade
terminal
yarn dlx @clerk/upgrade
terminal
pnpm dlx @clerk/upgrade

If you are having trouble with npx, it's also possible to install directly with npm i @clerk/upgrade -g, and can then be run with the clerk-upgrade command.

Breaking Changes

Removed: orgs claim on JWT

In the previous version of Clerk's SDKs, if you decode the session token that Clerk returns from the server, you'll currently find an orgs claim on it. It lists all the orgs associated with the given user. Now, Clerk returns the org_id, org_slug, and org_role of the active organization.

The orgs claim was part of the JwtPayload. Here are a few examples of where the JwtPayload could be found.

If you would like to have your JWT return all of the user's organizations, you can create a custom JWT template in your dashboard. Add { "orgs": "user.organizations" } to it.

Image URL Name Consolidation

There are a number of Clerk primitives that contain images, and previously they each had different property names, like avatarUrl, logoUrl, profileImageUrl, etc. In order to promote consistency and make it simpler for developers to know where to find associated images, all image properties are now named imageUrl. See the list below for all affected classes:

Deprecation removals & housekeeping

As part of this major version, a number of previously deprecated props, arugments, methods, etc. have been removed. Additionally there have been some changes to things that are only used internally, or only used very rarely. It's highly unlikely that any given app will encounter any of these items, but they are all breaking changes, so they have all been documented below.

For this section more than any other one, please use the CLI upgrade tool (npx @clerk/upgrade). Changes in this section are very unlikely to appear in your codebase, the tool will save time looking for them.

Deprecation removals

Other Breaking changes

What did you think of this content?

Clerk © 2024