Скачать или смотреть How to Run Your AWS Serverless Backend Locally for Development

Discover how to efficiently use `AWS Lambda` and `AWS API Gateway` together with serverless-offline to test your serverless application locally before deploying.
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How to Run Your AWS Serverless Backend Locally for Development

As more developers turn to serverless architectures, understanding how to effectively test and develop your backend locally is critical. If you've recently joined a project that utilizes AWS services like AWS Lambda and AWS API Gateway, you might find yourself in a challenging situation. As one developer expressed, they were unsure of how to run their backend APIs locally, which complicated their development workflow.

In this guide, we will cover how to set up and use a local serverless backend environment using serverless-offline, allowing you to test your changes without having to deploy your application every time.

Understanding the Serverless Architecture

Before diving into the setup, let’s clarify the typical serverless architecture:

API Gateway: It acts as a front door to access your backend services. When a client makes a request, it first goes to the API Gateway.

Lambda Function: The API Gateway then invokes the associated Lambda function, which contains the business logic.

Response Handling: Once the Lambda function processes the request, it sends a response back through the API Gateway to the client.

This architecture offers a lot of flexibility and scalability, but it can be cumbersome during the development phase if you can't test changes locally.

The Problem: No Local Development Script

In the scenario presented, the only available script is a bash script intended for deployment, which looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

While this script is useful for deploying the application, it does not serve the purpose of running the backend locally, which can significantly slow down development.

The Solution: Using serverless-offline

To solve this issue, you can use the serverless-offline plugin. This tool makes it simple to emulate AWS Lambda and API Gateway locally. Here's how you can set it up.

Step-by-Step Setup

Install serverless-offline: You need to add the serverless-offline plugin to your project dependencies. Run the following command in your terminal:

[[See Video to Reveal this Text or Code Snippet]]

Update serverless.yml: You need to include serverless-offline as a plugin in your serverless.yml configuration file. Open your serverless.yml file and add the following lines:

[[See Video to Reveal this Text or Code Snippet]]

Start the Local Server: With everything set up, you can now run your serverless application locally. This is done with the command:

[[See Video to Reveal this Text or Code Snippet]]

Benefits of Using serverless-offline

Speed: You can quickly test updates or changes without having to deploy changes to AWS.

Cost-effective: Running your tests locally avoids unnecessary costs associated with AWS resources while you're still developing.

Debugging: You can easily debug any issues directly in your local environment.

Conclusion

By following these steps, you can streamline your development process by running your AWS serverless backend locally. With tools like serverless-offline, you can effectively mimic your production environment, speeding up development and allowing for rapid iteration on your API.

Don't hesitate to dive deeper into the specifics of serverless framework, AWS Lambda, and other plugins that can enrich your development experience. Happy coding!