Create an api in api gateway to invoke a lambda function

Question

I am working on a project and trying to use API Gateway to invoke a lambda function. The lambda function is used to update a DynamoDB item. The DynamoDB table is used to keep a running count of visitors to a web page. I need to create an API to invoke the lambda function but I'm not sure how to create the API. Any assistance is appreciated.

Answer 1

General steps would be:

1. Create AWS_PROXY integration between API Gateway and your Lambda function. The example of this is in the AWS tutorials: Set up Lambda proxy integrations in API Gatewa and in Tutorial: Build a REST API with HTTP proxy integration

2. Add/amend execution role to your function allowing it to access DynamoDB. This is exemplified in the AWS tutorial: Using AWS Lambda with Amazon DynamoDB.

3. Test the API. It can be done directly in API gateway console, or using external tools such as curl or Postman.

Answer 2

I figured out my issue. In my lamdba function, I needed to change the output to a JSON object. Once I made the change, I was able to get my API working. Here is a link to the fix.