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triggerdotdev--trigger.dev/docs/guides/examples/vercel-sync-env-vars.mdx
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---
title: "Syncing environment variables from your Vercel projects"
sidebarTitle: "Vercel sync env vars"
description: "This example demonstrates how to sync environment variables from your Vercel project to Trigger.dev."
---
import VercelDocsCards from "/snippets/vercel-docs-cards.mdx";
<Warning>
**Deprecated when using the Vercel integration.** If you are using the [Vercel
integration](/vercel-integration), do not use `syncVercelEnvVars` — the integration handles env
var syncing natively and using both together can cause env vars to be incorrectly populated.
If you are **not** using the Vercel integration, `syncVercelEnvVars` is still supported. Continue
with the configuration below.
</Warning>
## Build configuration
If you are not using the [Vercel integration](/vercel-integration), you can sync environment variables manually by adding the `syncVercelEnvVars` build extension to your `trigger.config.ts` file. This extension will run automatically every time you deploy your Trigger.dev project.
<Note>
You need to set the `VERCEL_ACCESS_TOKEN` and `VERCEL_PROJECT_ID` environment variables, or pass
in the token and project ID as arguments to the `syncVercelEnvVars` build extension. If you're
working with a team project, you'll also need to set `VERCEL_TEAM_ID`, which can be found in your
team settings. You can find / generate the `VERCEL_ACCESS_TOKEN` in your Vercel
[dashboard](https://vercel.com/account/settings/tokens). Make sure the scope of the token covers
the project with the environment variables you want to sync.
</Note>
<Note>
When running the build from a Vercel build environment (e.g., during a Vercel deployment), the
environment variable values will be read from `process.env` instead of fetching them from the
Vercel API. This is determined by checking if the `VERCEL` environment variable is present. The
API is still used to determine which environment variables are configured for your project, but
the actual values come from the local environment.
</Note>
```ts trigger.config.ts
import { defineConfig } from "@trigger.dev/sdk";
import { syncVercelEnvVars } from "@trigger.dev/build/extensions/core";
export default defineConfig({
project: "<project ref>",
// Your other config settings...
build: {
// Add the syncVercelEnvVars build extension
extensions: [
syncVercelEnvVars({
// A personal access token created in your Vercel account settings
// Used to authenticate API requests to Vercel
// Generate at: https://vercel.com/account/tokens
vercelAccessToken: process.env.VERCEL_ACCESS_TOKEN,
// The unique identifier of your Vercel project
// Found in Project Settings > General > Project ID
projectId: process.env.VERCEL_PROJECT_ID,
// Optional: The ID of your Vercel team
// Only required for team projects
// Found in Team Settings > General > Team ID
vercelTeamId: process.env.VERCEL_TEAM_ID,
}),
],
},
});
```
<Note>
[Build extensions](/config/extensions/overview) allow you to hook into the build system and
customize the build process or the resulting bundle and container image (in the case of
deploying). You can use pre-built extensions or create your own.
</Note>
## Running the sync operation
To sync the environment variables, all you need to do is run our `deploy` command. You should see some output in the console indicating that the environment variables have been synced, and they should now be available in your Trigger.dev dashboard.
```bash
npx trigger.dev@latest deploy
```
<VercelDocsCards />