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Grokking Node.js Design Patterns for Interviews

Solution: Build a Vendor-Agnostic API Client Factory

Explore how to implement a vendor-agnostic API client factory in Node.js using the factory pattern. Learn to dynamically create REST, GraphQL, and SOAP clients based on configuration, maintaining a clean codebase and enabling easy extension.

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Solution explanation

  • Lines 1–17: We define three interchangeable client classes: RestClient, GraphQLClient, and SoapClient.

    • Each implements a .fetch() method, keeping the interface consistent for consumers.

    • RestClient simulates REST API calls, GraphQLClient represents query-based requests, and SoapClient mimics XML-style service interactions. ...