Handling GET Requests with Path Parameters in AWS Lambda
Learn how to handle GET requests with path parameters in AWS Lambda using TypeScript.
Handling path parameters in Lambda functions
A number of our Lambda functions have a path parameter within them. So, to GET
details of a particular user, we will need to use the URL /users/{userId}
, where we substitute the {userId}
variable with the actual value. In other words, to GET the details of a user named test_user_1
, our path would need to be /users/test_user_1
. This is a standard REST pattern, where the URL itself contains a parameter.
Let’s now take a look at how the definition of the user’s GET Lambda function in our template.yaml
file supports this syntax as follows:
UserGetApiFunction:Type: AWS::Serverless::FunctionProperties:CodeUri: api-handlers/Handler: users.getHandlerRuntime: nodejs14.xEvents:HelloWorld:Type: ApiProperties:Path: /users/{userId}Method: getPolicies:- DynamoDBCrudPolicy:TableName: !Ref UserTable
Here, the definition of the Lambda function named UserGetApiFunction
is almost
identical to the previous definition, with two notable exceptions.
-
Firstly, we have specified on line 5 that the handler function is named
getHandler
within the ...
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