Error: Cannot find module 'express' when running on Azure

Question

I have a node.js app which uses express and runs locally with no problems. However, on Azure I am seeing:

Application has thrown an uncaught exception and is terminated:
Error: Cannot find module 'express'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (D:\home\site\wwwroot\server.js:1:79)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)

The packages.json file contains the dependency:

"express": "^4.15.3"

Assuming something had gone wrong with the npm install, I went to the Kudu remote execution console and ran npm outdated. No packages are missing.

This is my server.js file:

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

const port = process.env.port || 8000;

app.use(bodyParser.urlencoded({ extended: true }));

require('./app/routes')(app);
app.listen(port, () => {
});

I'm assuming it is something very obvious, but I can't work out what I'm missing.

Quad Coders · Accepted Answer · 2020-12-04 06:41:22Z

2

Assuming your Azure App Service is Windows environment, try to include node_modules in the wwwroot.

answered Dec 4, 2020 at 6:41

Quad Coders

6681 gold badge6 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Aaron Chen · Accepted Answer · 2017-06-16 06:52:42Z

1

There isn't much we can really help with here, as the error you have provided indicates that the express npm package has not been installed properly. So, I would suggest that you use App Service Editor (https://[YouAppName].scm.azurewebsites.net/dev/wwwroot/) to troubleshoot this issue by checking whether the express folder exists in the node_module.

You can also run command npm install in the console, restart your app and run it (Ctrl + F5) in the browser.

answered Jun 16, 2017 at 6:52

Aaron Chen

9,9701 gold badge20 silver badges30 bronze badges

1 Comment

chhantyal Over a year ago

In my case, it was because of failed deployment (Azure didn't notify though). You can go to Deployment options and check if it failed. Redeploying it seems to fix it.

Kiran Gali · Accepted Answer · 2023-03-16 18:26:54Z

0

check your package.json, it should have express included.

it should be similar to this

 "dependencies": {
    "@azure/storage-file-datalake": "^12.12.0",
    "express": "^4.18.2",
    "brotli": "^1.3.0",
    "bson": "^2.0.4",
    "int53": "^0.2.4",
    "object-stream": "0.0.1",
    "snappyjs": "^0.6.0",
    "thrift": "^0.10.0",
    "varint": "^5.0.0"
  }

answered Mar 16, 2023 at 18:26

Kiran Gali

1116 bronze badges

Collectives™ on Stack Overflow

Error: Cannot find module 'express' when running on Azure

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related