AWS Lambda - Runtime.ImportModuleError: Error: Cannot find module 'jmespath'

Question

I am working with aws lambda using serverless framework, I changed the runtime from nodejs8.10 to nodejs10.x, then I got an errortrace,

{"errorType":"Runtime.ImportModuleError","errorMessage":"Error: Cannot find module 'jmespath'","stack":["Runtime.ImportModuleError: Error: Cannot find module 'jmespath'","    at _loadUserApp (/var/runtime/UserFunction.js:100:13)","    at Object.module.exports.load (/var/runtime/UserFunction.js:140:17)","    at Object.<anonymous> (/var/runtime/index.js:36:30)","    at Module._compile (internal/modules/cjs/loader.js:701:30)","    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)","    at Module.load (internal/modules/cjs/loader.js:600:32)","    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)","    at Function.Module._load (internal/modules/cjs/loader.js:531:3)","    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)","    at startup (internal/bootstrap/node.js:283:19)"]}

What is the cause of this issue and how can get it fixed?

Answer 1

I hit the same problem Error: Cannot find module 'jmespath' and solved it.

Do you use aws-sdk via node_modules? like follows

var aws = require('aws-sdk');

If so you just remove aws-sdk from node_modules.

remove aws-sdk for yarn

yarn remove aws-sdk

remove aws-sdk for npm

npm uninstall aws-sdk

aws-sdk has been included to lambda since nodejs10. see: https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

Answer 2

In the root serverless project folder

npm i --save <npm module name missing>

Answer 3

Try to put ./ in front of your module name. I changed my name from require("xxx") to require("./xxx") and it worked again. In my case, the local module file i wanted to add (xxx.js) is on the same level as the index.js file.

Answer 4

I'd also like to add that as a preliminary step before adjusting your path, check and verify your dependencies listed in your package.json(s) files.
I've seen this error "Runtime.ImportModuleError","errorMessage":"Error: Cannot find module 'something' occur in the aws cloudwatch logs. It happened because my project has multiple subprojects/subfolders with their own package.json files. Ensure that module is properly referenced in the subproject's package.json.
In local dev, you might have the dependency cited in your base/global package.json, and thinking it works -- but when you deploy the lambda the npm install that occurs during build does not include the newly required module because its not referenced in the local subproject's package.json.