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How to create API Service using AWS API gateway and AWS lambda

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Author: Himanshu Saxena

Here are the steps to create an API server using AWS API Gateway and AWS Lambda:

Step 1: Set Up AWS Account
  1. Sign in to AWS Management Console: If you don’t have an account, create one.
  2. Navigate to AWS Management Console: Go to the AWS Management Console.
Step 2: Create a Lambda Function
  1. Navigate to AWS Lambda: In the AWS Management Console, search for “Lambda” and select it.
  2. Create a Function: Click on “Create function”.
  3. Choose a Blueprint: Select “Author from scratch”.
  4. Configure the Function: 
    • Function name: Give your function a name.
    • Runtime: Choose the runtime (e.g., Node.js, Python).
    • Role: Choose an existing role or create a new one with basic Lambda permissions.
  5. Write Your Code: In the function code section, write your code or upload a ZIP file.
  6. Save: Click on “Deploy” to save your function.
Step 3: Create an API in API Gateway
  1. Navigate to API Gateway: In the AWS Management Console, search for “API Gateway” and select it.
  2. Create an API: Click on “Create API”.
  3. Choose an API Type: Select “HTTP API” or “REST API” based on your needs.
  4. Configure the API: 
    • API name: Give your API a name.
    • Endpoint Type: Choose the endpoint type (e.g., Regional).
Step 4: Integrate API Gateway with Lambda
  1. Create a Resource: In your API, create a new resource (e.g., /myresource).
  2. Create a Method: Under the resource, create a new method (e.g., GET, POST).
  3. Integration Type: Choose “Lambda Function”.
  4. Lambda Region: Select the region where your Lambda function is deployed.
  5. Lambda Function: Enter the name of your Lambda function.
  6. Save: Click on “Save” and confirm the permissions.
Step 5: Deploy the API
  1. Create a Deployment Stage: Click on “Deploy API”.
  2. Stage Name: Enter a stage name (e.g., dev, prod).
  3. Deploy: Click on “Deploy”.
Step 6: Test the API
  1. Invoke the API: Use the provided endpoint URL to test your API.
  2. Check Logs: Use CloudWatch to check the logs for your Lambda function.
Step 7: Secure Your API (Optional)
  1. Enable CORS: Configure Cross-Origin Resource Sharing (CORS) if needed.
  2. API Keys: Set up API keys for access control.
  3. IAM Roles: Use IAM roles and policies to secure your API.

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