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Why can my code run in a standard Node.js file, but not in a AWS Lambda Function?

By : Leo
Date : July 29 2020, 09:00 AM
fixed the issue. Will look into that further You're trying to combine async/await with callbacks. That won't work in a lambda AWS Lambda Function Handler in Node.js. The reason it's working locally, or in a node server, is because the server is still running when the function exits, so the callback still happens. In a Lambda the node process is gone as soon as the lambda exits if you are using async (or Promises), so the callback is not able to be fired.
code :

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Is there a standard function code like `lambda x, y: x.custom_method(y)`?

By : PeteC
Date : March 29 2020, 07:55 AM
should help you out Yes, it is still called operator.methodcaller():
code :
from itertools import 
map(str.split, list_of_strings, [','] * len(list_of_strings), range(len(list_of_strings)))

Node.js Lambda Function Not Working When Downloading S3 File

By : Tim Morath
Date : March 29 2020, 07:55 AM
should help you out I'm pretty sure you're using the async library incorrectly. The returnFile function callback parameters seem incorrect.
Also, make sure your Lambda has proper permissions to access the bucket granted via it's IAM Policy. Then you don't need to supply your access credentials to the AWS SDK, it will pull them automatically.

I have a lambda function in which I am fetching a csv file from s3 now I want to run SQL query on that data in node.js?

By : user2095883
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I found module "querycsv" in python , so I changed environment of code to Python. https://pythonhosted.org/querycsv/

lambda function using node js that query S3 json file

By : user2395885
Date : March 29 2020, 07:55 AM
wish helps you I understand what you are trying to accomplish here but that is not the right way to do it.
code :
function getS3Objects(bucket,key){
    return s3.getObject({Bucket:bucket,Key:key,ResponseContentType:'application/json'})
               .promise().then(file=>{return file})
               .catch(error =>{return error});
getS3Objects(bucket,objectKey).then(response => console.log(response));
s3.getObject(params, function(err, data) {
    if (err) console.log(err, err.stack); // an error occurred
    else     console.log(data);
function getS3Objects(bucket, key) {
    return new Promise((resolve, reject) => {
                Bucket: bucket,
                Key: key,
                ResponseContentType: 'application/json'
            (err, data) => {
                if (err) {
                } else {

S3 Video to audio file convert using Node js (Lambda function)

By : Olivier Agnus
Date : March 29 2020, 07:55 AM
Hope that helps You just need to set up an event on s3 bucket - put object - to trigger lambda function (you will get access to the description of the object uploaded to that S3 bucket through the first parameter of the lambda function).
If you can convert the video file to audio on your local machine, using some external libraries, then you need to create a zip file containing your lambda function (in the root of the zip file) as well as the dependencies.
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