How to display data in the response of DynamoDB scan within Lambda function?

Question

I'm pretty new to AWS API Gateway, Lambda and DynamoDB, but I did a little bit of research and figured out how to build a simple Lambda function that scans a DynamoDB table.

I think I've successfully scanned the table and in the callback have access to the results within the data variable.

Right now, my function just completes with a Succeeded message, but I can't for the life of me actually figure out how to display the data that it scanned as the response. Any help would be greatly appreciated.

var AWS = require('aws-sdk');
var dynamodb = new AWS.DynamoDB({apiVersion: '2012-08-10'});

exports.handler = function(event, context) {
    var tableName = "MyTableName";
    dynamodb.scan({
        TableName : tableName
    }, function(err, data) {
        if (err) {
            context.done('error','reading dynamodb failed: '+err);
        }
        context.succeed('Success');
    });
};

Do you mean how to stream the data? You can return the data as JSON. Example callback(null, jsonString); — notionquest
– notionquest, Commented Nov 1, 2016 at 14:10
@notionquest Yes, return the JSON data. Can you expand on where that code would actually be placed within the function? — Tom Nolan
– Tom Nolan, Commented Nov 1, 2016 at 14:14

adamkonrad · Accepted Answer · 2016-11-02 16:12:17Z

1

Right now you are returning the string 'Success'. Instead, return whatever you actually want to return. For example: context.succeed(null, data);

edited Nov 2, 2016 at 16:12

adamkonrad

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answered Nov 1, 2016 at 14:17

Mark B

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1 Comment

Tom Nolan Over a year ago

That did it, thank you. I thought I tried that already, and it gave an error Process exited before completing request, but this time it worked, so I appreciate it!

adamkonrad · Accepted Answer · 2016-11-02 16:11:43Z

0

Please refer the sample code here.

exports.handler = function(event, context, callback) {
    var tableName = "MyTableName";
    dynamodb.scan({
        TableName : tableName
    }, function(err, data) {
        if (err) {
            context.done('error','reading dynamodb failed: '+err);
        }            
        callback (null, data);
    });
};

edited Nov 2, 2016 at 16:11

adamkonrad

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answered Nov 1, 2016 at 14:19

notionquest

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