Building a TypeScript API SDK using Webpack that uses Authorization

Developing an SDK (Software Development Kit) simplifies interactions with APIs for client developers. In this blog, we’ll create a TypeScript SDK for a User API, using Webpack for bundling and extracting types into a separate file. We'll also include support for an Authorization header for secure API requests.

This SDK will cover the following operations:

  • Create a User (POST /users)
  • Update a User (PUT /users)
  • Get All Users (GET /users)
  • Get a Single User (GET /users/{id})
  • Delete a User (DELETE /users/{id})
  • Partially Update a User (PATCH /users/{id})

We will go through below steps
  1. Project Setup
  2. Defining the User Types
  3. Creating the API SDK
  4. Configuring Webpack
  5. Building the SDK and Extracting Types
  6. Testing the SDK
  7. Conclusion

1. Project Setup

First, create a directory for your SDK and initialize it with a package.json:

Install the required dependencies:


Folder Structure

Organize the project as follows:


2. Defining the User Types

Create a src/types.ts file to define the types used in the SDK:


3. Creating the API SDK

Implement the API methods in src/api.ts:


SDK Usage Example

Add an entry point in src/index.ts:



4. Configuring Webpack

Create a webpack.config.js file to configure the Webpack build:


5. Building the SDK and Extracting Types

5.1 Compile TypeScript

Add a tsconfig.json file to configure TypeScript:


5.2 Build the SDK

Update the package.json scripts:

Run the build command:


This will output:

  • The bundled SDK (dist/index.js)
  • The type definitions (dist/types)

6. Testing the SDK

To test your SDK, use it in a separate project or a testing script.

Example Usage

Create a test.js file


7. Conclusion

With this guide, you've built a fully functional TypeScript SDK for managing Users via REST APIs. The SDK includes:

  • Strongly Typed Interfaces: Ensuring type safety for API operations.
  • Authorization Support: Simplifying secure interactions.
  • Webpack Configuration: Enabling SDK bundling and distribution.
  • Type Declaration Extraction: Facilitating type sharing with consuming applications.

This modular and scalable approach sets a solid foundation for building more extensive SDKs in the future. Happy coding! 🚀

I will add a working example with the git repo soon.

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