Functions

Membrane Functions implement business logic inside Membrane Elements.

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Function Types

Functions can be implemented in one of the following ways depending on where the function is used:

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Core Implementation Function Types

• Mapping – Transform input data using JSONata expressions without making API calls
• REST API Mapping – Map to REST API endpoints
• JavaScript – Write custom code for maximum flexibility
• GraphQL API Mapping – Map to GraphQL API endpoints

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API Request Action Function Types

• api-request-to-external-app – Make API requests to the external service
• api-request-to-your-app – Make API requests to your internal API
• http-request – Make arbitrary HTTP requests to any endpoint

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Code Execution Action Function Types

• JavaScript – Run custom JavaScript/TypeScript code (includes run-javascript action type)

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Flow Node Function Types

• run-action – Run predefined actions

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Special Function Types

• not-supported – Mark function as not supported by the external API