Sever-less AWS Lambda Dynamodb throw internal error

Question

I made one todo app by using lambda. I used sever-less framework for deployment. I made one post request where user can create a todo-list. For testing I am using post-man. For my Lambda function I am using async function. I can able to make post request and my item store in Dynamo db but I got response Internal server error. My goal is show in my postman what I kind of post request I made.

Here is my code:

'use strict'
const AWS = require('aws-sdk');
const uuid = require('uuid');

const dynamoDb = new AWS.DynamoDB.DocumentClient();

module.exports.createTodo = async (event) => {
  const datetime = new Date().toISOString();
  const data = JSON.parse(event.body);
  const params = {
    TableName: 'todos',
    Item: {
      id: uuid.v1(),
      task: data.task,
      done: false,
      createdAt: datetime,
      updatedAt: datetime
    }
  };
  try {
    let data = await dynamoDb.put(params).promise();
    console.log(data);
    return JSON.stringify(data); // this throw me internal server error.
  } catch (error) {
    console.log(error);
  }
};

Sarthak Jain · Accepted Answer · 2021-03-03 11:33:07Z

1

Since you are calling the Lambda function via API Gateway, you need to convert the response to the following structure -

return {
  statusCode: 200,
  body: JSON.stringify(data),
  // headers: {'Content-Type': 'application/json'}, // Uncomment if needed by your client
}

answered Mar 3, 2021 at 11:33

Sarthak Jain

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4 Comments

Krisna Over a year ago

Sorry my mistake, I changed the payload and did not deploy it that's why I got the error. But I used your return but now I got empty object. is there any way I can retrieve the post payload,

Sarthak Jain Over a year ago

You are returning data which is the ddb putItem response. Do you want to return that or the function input? Can you add console.log(JSON.stringify(data)) before you return and check what is getting logged?

Krisna Over a year ago

Sorry, I am new to Lambda. I got what you mean now, I added event body now I am getting: "{\n \"task\": \"nodddnhjbhfyuyttdrdtrsrtydryrddytucddddddfyufyfiyifuyii\"\n}". is there any way I can just display : "task": "nodddnhjbhfyuyttdrdtrsrtydryrddytucddddddfyufyfiyifuyii"

Krisna Over a year ago

I did this: let response = { statusCode: 200, body: event.body, headers: { 'Content-Type': 'application/json' }, // Uncomment if needed by your client } return response; I got what I wanted but my question is how I just got the body

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