# System environment variables Stormkit injects several environment variables available to your deployment.

| Variable | Description | | ------------------- | ----------------------------------------------------------------------------------------------- | | `SK_APP_ID` | The application ID which is currently being deployed.
Example: `40140` | | `SK_BRANCH_NAME` | The branch name which is currently being deployed.
Example: `main` | | `SK_DEPLOYMENT_ID` | The deployment ID.
Example: `591950` | | `SK_DEPLOYMENT_URL` | The preview URL of the deployment.
Example: `my-app--591950.stormkit.dev` | | `SK_ENV` | The environment name that is currently being used as a configuration.
Example: `staging` | | `SK_ENV_ID` | The environment ID that is currently being used as a configuration.
Example: `20510` | | `SK_ENV_URL` | The URL of the environment.
Example: `my-app--staging.stormkit.dev` | | `SK_COMMIT_SHA` | The long-format commit SHA.
Example: `1d804406ca177329541ed1b6468d8da794aab109` | | `STORMKIT` | This indicates that we're on a Stormkit environment. The value is always `true` (string). |