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

问题

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Assuming something had gone wrong with the npm install, I went to the Kudu remote execution console and ran npm outdated.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.

回答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.

回答2:

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

来源：https://stackoverflow.com/questions/44576294/error-cannot-find-module-express-when-running-on-azure

标签

node.js

azure

express