Lambda Function Error

Question

I created Lambda function(Node.js) for image resizing.
I got Runtime.HandlerNotFound error.

Cloudwatch log as follows:

2022-07-15T01:06:22.016Z	undefined	ERROR	Uncaught Exception 	{
    "errorType": "Runtime.HandlerNotFound",
    "errorMessage": "index.handler is undefined or not exported",
    "stack": [
        "Runtime.HandlerNotFound: index.handler is undefined or not exported",
        "    at Object.module.exports.load (/var/runtime/UserFunction.js:283:11)",
        "    at Object. (/var/runtime/index.js:43:34)",
        "    at Module._compile (internal/modules/cjs/loader.js:1085:14)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)",
        "    at Module.load (internal/modules/cjs/loader.js:950:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:790:12)",
        "    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)",
        "    at internal/main/run_main_module.js:17:47"
    ]
}

Some of my Index.js is as follows:

'use strict';

const querystring = require('querystring'); // Don't install.
const AWS = require('aws-sdk'); // Don't install.

// http://sharp.pixelplumbing.com/en/stable/api-resize/
const Sharp = require('sharp');

const S3 = new AWS.S3({
  region: 'ap-northeast-2'  // 
});

const BUCKET = 'BUCKET_NAME' // Input your bucket

// Image types that can be handled by Sharp
const supportImageTypes = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'svg', 'tiff', 'jfif'];

exports.handler  = async(event, context, callback) => {
  const { request, response } = event.Records[0].cf;

console.log("request: ", request)
  console.log("response: ", response)
.
.
.
.

Accepted Answer

can you check if the path of the handler and location of the index file in the packaged code is same?
You will get this error when the path of the handler and the location of index.js in the package is not the same.

![Enter image description here](https://repost.aws/media/postImages/original/IMHxV7NmMUSQWk3DvBxvYF7w)

Answer

Your handler setup looks different to that described in https://docs.aws.amazon.com/lambda/latest/dg/nodejs-handler.html - are you sure it's equivalent?  I don't use node.js so can't tell for sure, but it looks a good place to start.

Answer

I notice documentation always says "index.js" but you mentioned "Index.js".  I have no idea if it's relevant but just in case ...

Answer

I think you packaged a zip file which does not contains the index.js in root of zip

The zip commands can give you a zip file containing another folder inside which contains the index js

Try to verify the content of package

Answer

I replaced Index.js as follows:

exports.handler = function (event, context, callback)  {
.
.
.

but I got same error on cloudwatch.

2022-07-15T02:04:22.891Z	undefined	ERROR	Uncaught Exception 	
{
    "errorType": "Runtime.HandlerNotFound",
    "errorMessage": "index.handler is undefined or not exported",
    "stack": [
        "Runtime.HandlerNotFound: index.handler is undefined or not exported",
        "    at Object.module.exports.load (/var/runtime/UserFunction.js:283:11)",
        "    at Object. (/var/runtime/index.js:43:34)",
        "    at Module._compile (internal/modules/cjs/loader.js:1085:14)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)",
        "    at Module.load (internal/modules/cjs/loader.js:950:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:790:12)",
        "    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)",
        "    at internal/main/run_main_module.js:17:47"
    ]
}

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