AWS Lambda error "Cannot find module 'mongodb'"

Question

I've successfully deployed my function to AWS.

When trying to invoke the function (serverless invoke -f facebookAdInsert -l), I get the following error:

{
    "errorMessage": "Cannot find module 'mongodb'",
    "errorType": "Error",
    "stackTrace": [
        "Function.Module._load (module.js:474:25)",
        "Module.require (module.js:596:17)",
        "require (internal/module.js:11:18)",
        "Object.<anonymous> (/var/task/src/facebookAdInsert.js:222:18)",
        "__webpack_require__ (/var/task/src/facebookAdInsert.js:20:30)",
        "Object.<anonymous> (/var/task/src/facebookAdInsert.js:234:16)",
        "__webpack_require__ (/var/task/src/facebookAdInsert.js:20:30)",
        "Object.<anonymous> (/var/task/src/facebookAdInsert.js:303:16)",
        "__webpack_require__ (/var/task/src/facebookAdInsert.js:20:30)"
    ]
}

Here are my dependencies:

"dependencies": {
    "@babel/core": "^7.3.4",
    "@babel/preset-env": "^7.3.4",
    "aws-sdk": "^2.268.1",
    "babel-loader": "^8.0.5",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-es2015": "^6.24.1",
    "dotenv": "^6.0.0",
    "moment": "^2.24.0",
    "mongodb": "^3.1.10",
    "mongoose": "^5.4.17",
    "parse-mongo-url": "^1.1.1",
    "request": "^2.88.0",
    "serverless-offline": "^3.33.0",
    "serverless-webpack": "^5.2.0",
    "webpack": "^4.29.6",
    "webpack-node-externals": "^1.7.2"
}

Any ideas as to what the issue could be? Based on my research possible solutions were running npm install before deploying and moving all "devDependencies" to "dependencies" but those have not worked.

have you manage to solve it? Can you share your serverles.yml file? — Marcelo Fonseca
– Marcelo Fonseca, Commented Jun 7, 2020 at 3:14

Leonel Corso · Accepted Answer · 2019-11-14 19:16:34Z

2

You are missing the mongodb layer for AWS lambda

Open a terminal and type

mkdir nodejs
cd nodejs
npm init -y
npm install mongodb
zip the entire nodejs folder, making sure that if you unzip the folder you get the following structure

    nodejs
      +---node_modules
             +---------- (mongodb and other folders)

Upload this layer to AWS Lambda
Add the layer to your Lambda function

With this it should work without problems.

Regards

answered Nov 14, 2019 at 19:16

Leonel Corso

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1 Comment

strix25 Over a year ago

do you have to upload .zip file then every time you make some change ?

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