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Define environment variables per application in the Environment Variables panel. These variables are automatically injected into the live preview, build pipeline, and deployments.

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Live Reload

When you update or delete an environment variable, the preview automatically reloads with the changes — no restart needed.

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System Variables

System variables like MAJOR_API_BASE_URL cannot be overridden. Any variable with the MAJOR_ prefix is reserved.

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Deployed Apps

After changing environment variables in a deployed app, click Redeploy to apply them to the live deployment. Environment variable changes do not take effect on deployed apps until redeployed.

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CLI

You can also manage environment variables from the CLI. Environment names are case-insensitive, so --env staging and --env Staging resolve to the same environment. See the CLI Resource docs for details.