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adds changelog for new default env vars in workers builds #22988

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merged 4 commits into from
Jun 11, 2025
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adds changelog for new default env vars in workers builds #22988

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adds changelog for new default env vars in workers builds
korinne Jun 10, 2025
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mentions that this is a previous Pages feature
korinne Jun 10, 2025
bfac0a9
updates title
korinne Jun 10, 2025
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Update src/content/changelog/workers/2025-06-10-default-env-vars.mdx
korinne Jun 10, 2025
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25 changes: 25 additions & 0 deletions src/content/changelog/workers/2025-06-10-default-env-vars.mdx
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---
title: Default system environment variables in Workers Builds
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@irvinebroque irvinebroque Jun 10, 2025

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not sure I would consider these "default system environment variables" if they are variables related to the git commit/branch?

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@korinne korinne Jun 10, 2025

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Updated the title! We do call them "system environment variables" in the docs, but agreed, not super accurate.

description: Workers Builds now injects default environment variables
products:
- workers
date: 2025-06-10T01:00:00Z
---

[Workers Builds](/workers/ci-cd/builds/) connects your Worker to a [Git repository](/workers/ci-cd/builds/git-integration/), and automates building and deploying your code on each pushed change.

To make CI/CD pipelines even more flexible, Workers Builds now automatically injects [default system environment variables](/workers/ci-cd/builds/configuration/#environment-variable) into your build process (much like the defaults in [Cloudflare Pages projects](/pages/configuration/build-configuration/#environment-variables)). You can use these variables to customize your build process based on the deployment context, such as the branch or commit.

The following system environment variables are injected by default:

| Environment Variable | Injected value | Example use-case |
| ----------------------- | ------------------------------- | --------------------------------------------------------------------------------------- |
| `CI` | `true` | Changing build behavior when run on CI versus locally |
| `WORKERS_CI` | `1` | Changing build behavior when run on Workers Builds versus locally |
| `WORKERS_CI_BUILD_UUID` | `<build-uuid-of-current-build>` | Passing the Build UUID along to custom workflows |
| `WORKERS_CI_COMMIT_SHA` | `<sha1-hash-of-current-commit>` | Passing current commit ID to error reporting, for example, Sentry |
| `WORKERS_CI_BRANCH` | `<branch-name-from-push-event` | Customizing build based on branch, for example, disabling debug logging on `production` |

You can override these default values and add your own custom environment variables by navigating to **your Worker** > **Settings** > **Environment variables**.

Learn more in the [Build configuration documentation](/workers/ci-cd/builds/configuration/#environment-variables).
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