Cannot access event.queryStringParameters[ ... ][ ... ]

I believe i’m having issues with this topic as well… How do you access queryStringParameter?, if I remove the extra JSON argument in the call to API.get it works perfect! I’m just trying to figure out if this is indeed a problem with AWS amplify and how i’m sending the JSON parameter. Thank you in advance if you can push me in the correct direction.

My client side code (aws-amplify 0.2.11 ): return API.get('trips','/days', {'queryStringParameters': {'param1': "99b60260-363c-11e8-b7ca-250a890d0675"}})

My API side code ( using serverless-webpack v 1.6.0, aws sdk v 2.202.0 ) : serverless.yml file :

listDays:
        handler: listDays.main
        events:
          - http:
              path: days
              method: get
              cors: true
              authorizer: aws_iam

API-javascript listDays.js code trying to access the event, the event.queryStringParameter.param1 just causes an error because it’s null:

export async function main(event,context,callback) {

    const params = {
        TableName: "DAYS",

        KeyConditionExpression: "tripId = :tripId",
        ExpressionAttributeValues: {
            ":tripId": event.queryStringParameters.param1
        }
    }

  //console.log(data.tripId)
    try {
        //result will return an array of trips
        const result = await dynamoDbLib.call("query", params)
        callback(null, success(result.Items))
    } catch (e) {
        callback(null, failure({status: false}))
    }
}

[causingchaos2]

For any amature coder like myself: Because appending a JSON object queryStringParamaters is currently not implemented yet, Calling using AWS-amplify, on the client code side by appending to URL:

return API.get('trips',/days?param1=${this.props.tripId})

API-side Node.js code: serverless yml file:

listDays:
        handler: listDays.main
        events:
          - http:
              path: days
              method: get
              cors: true
              authorizer: aws_iam

you access param1 by doing the following, also in the API-side Node.js code:

if (event.queryStringParameters !== null && event.queryStringParameters !== undefined) {
        if (event.queryStringParameters.param1 !== undefined &&
          event.queryStringParameters.param1 !== null &&
          event.queryStringParameters.param1 !== "") {
          console.log("Received proxy: " + event.queryStringParameters.param1);
          tripId = event.queryStringParameters.param1;
        }
      }

[franciscocpg]

@HyperBrain I’ve never used aws-amplify too, but as you’ve mentioned, 1. It’s just an API URL call with query parameter and 2. it’s necessary to check queryStringParameters before using it. Here is an example from aws docs.

if (event.queryStringParameters !== null && event.queryStringParameters !== undefined) {
        if (event.queryStringParameters.name !== undefined && 
            event.queryStringParameters.name !== null && 
            event.queryStringParameters.name !== "") {
            console.log("Received name: " + event.queryStringParameters.name);
            name = event.queryStringParameters.name;
        }
}

Also it looks like that queryStringParameters is not working in aws-amplify: https://github.com/aws/aws-amplify/issues/127.

And there is an opened PR about this issue: https://github.com/aws/aws-amplify/pull/378