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Environment variables allow you to securely store API keys and other sensitive configuration values. These variables are used in development mode, when running your scripts, and for LLM-based tests, such as LLM-as-a-judge evaluations.

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Workspace-level environment variables

Workspace-level environment variables are shared across all projects in your workspace. To set them, navigate to Workspace settings → Environment variables.

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Pre-defined variables

Openlayer provides pre-defined fields for commonly used API keys:
  • OPENAI_API_KEY
  • ANTHROPIC_API_KEY
  • AZURE_OPENAI_API_KEY
  • AZURE_OPENAI_ENDPOINT
  • GOOGLE_API_KEY
and others, which are used by popular LLM providers.

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Custom variables

You can also add arbitrary key-value pairs for any other environment variables your system requires.

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Project-level environment variables

Project-level environment variables work the same way as workspace-level ones, but are specific to a single project. They are only used during development mode runs and LLM-based tests within that project. To set them, navigate to Project settings → Select your project → Environment variables.
If an environment variable is already set at the workspace level, you will see a tag indicating that it is inherited on the project-level page. You can override inherited variables by setting a new value at the project level.