Lambda doesn't create data in DynamoDB

Question

I get a code response 200 successful
but a null json message on Postman

Data is not created in DynamoDB. This is my lambda:

exports.handler = async (event, context, callback) => {

 const id = replaceAll(event.queryStringParameters.authorId, " ", "-").toLowerCase();

 const params = {
     Item: {
         id: {
             S: id
         },
         title: {
             S: event.queryStringParameters.title
         },
         watchHref: {
             S: event.queryStringParameters.watchHref
         },
         authorId: {
             S: event.queryStringParameters.authorId
         },
         length: {
             S: event.queryStringParameters.length
         },
         category: {
             S: event.queryStringParameters.category
         }
     },
     TableName: "todos"
 };

 // console.log("@@@@@@@@@@@ ID " + params.Item.id.S + "");
 // console.log("@@@@@@@@@@@ Title " + params.Item.title.S + "");
 // console.log("@@@@@@@@@@@ Title " + params.Item.watchHref.S + "");
 // console.log("@@@@@@@@@@@ Title " + params.Item.authorId.S + "");
 // console.log("@@@@@@@@@@@ Title " + params.Item.length.S + "");
 // console.log("@@@@@@@@@@@ Title " + params.Item.category.S + "");


 dynamodb.putItem(params, function (err, data) {

     console.log("@@@@@@@@@@@ ID " + params.Item.id.S + "");

     if (err) {
         console.log("@@@@@@@@@@@ ERROR" + err);
         callback(err);
     } else {
         console.log("@@@@@@@@@@ INSIDE ELSE");
         callback(null, {
             id: params.Item.id.S,
             title: params.Item.title.S,
             watchHref: params.Item.watchHref.S,
             authorId: params.Item.authorId.S,
             length: params.Item.length.S,
             category: params.Item.category.S
         });
     }
 });
};

What am I doing wrong? I folowed the same principles that on the documentation.

As a reference, I'm doing it with HTTP API gateway proxy integration and this is my table:

what is replaceAll ? should it be event.queryStringParameters.authorId.replace(" ", "-").toLowerCase(); — Balu Vyamajala
– Balu Vyamajala, Commented Jan 14, 2021 at 3:11

Marcin · Accepted Answer · 2021-01-14 03:13:17Z

2

This is probably because you are using async function handler which finishes before you get any results. One way to overcome this is using a Promise pattern as shown in aws docs.

Or maybe you don't want to use async handler at all. In this case you should remove async from your function and adjust the handler as shown in docs for non-async handlers.

answered Jan 14, 2021 at 3:13

Marcin

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2 Comments

ElKePoN Over a year ago

lol I just removed it and it worked, so I put the async because it makes sense to create the data and then handle whatever else is happening no? and thanks for the docs

Marcin Over a year ago

@Arturo I don't have particular opinion/insight on that.

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