Currently I am working on online yaml code editor. I use expressjs framework for it. I want to install yamljs module to it. How do I install it? Because following code line cause to an error.
var YAML = require('yamljs');
This is the code segment
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var routes = require('./routes/index');
var users = require('./routes/users');
var YAML = require('yamljs');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
This is the error
Error: Cannot find module 'yamljs'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/home/tharindu/Documents/projects/Group project2/CuubezFinal/app.js:12:12)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
I use webstorm for coding. I have installed yamljs module using
npm install yamljs
This library is perfectly using if I run my code manually from the ubuntu terminal. But When I run the expressjs project, It gives above error.
could you provide more information like the error text?
Have you tried
npm install yamljs
to make the module accessible to the node environment?
This library is perfectly using if I run my code manually from the
ubuntu terminal. But When I run the expressjs project, It gives above
error.
Make sure your node_modules folder is available in the same or a more outer directory than the folder of your executing script.
Related
I have a problem. I am trying to run my NodeJS script using the command:
node /var/script/NodeJS/test.js
But when I run it, I get the following error:
/var/script/NodeJS/node_modules/node-fetch/src/index.js:9
import http from 'http';
^^^^
SyntaxError: Unexpected identifier
at Module._compile (internal/modules/cjs/loader.js:723:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object.<anonymous> (/var/script/NodeJS/test.js:2:15)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
I have already run the following commands in the terminal:
cd /var/script/NodeJS
npm install
npm install http
npm install node-fetch
I am running node version: v10.19.0
Here is the code I have that gives the error:
const express = require("express");
const fetch = require('node-fetch');
const app = express();
const PORT = process.env.PORT = 8787;
let router = express.Router();
It's just the imports, but this code already gives the provided error!
I can see both the modules in the node_module folder, so why am I getting this error and how can I fix this?
This can happen if you use a 3.X version of node-fetch and a Node version less than 12.20.0
Because node-fetch from v3 is an ESM-only module.
According to the documents you must install a version 2.X or less
npm install node-fetch#2
rename file extension from .js to .mjs
filename must be: test.mjs
import fetch from 'node-fetch';
const express = require("express");
const app = express();
let router = express.Router();
const PORT = process.env.PORT = 8787;
also keep in mind node-fetch has requriements on node version:
https://github.com/node-fetch/node-fetch/blob/main/package.json#L14
"engines": {
"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
},
run it as: node test.mjs
Bonus: If You don't like to use mjs and etc try to install node-fetch#2.6.5
npm i --save node-fetch#2.6.5
Im Learning to make a web application with Node.js Express JS.
When I run my server.js
$ node server
I get this
Error: Cannot find module './config/express'
at Function.Module._resolveFilename (module.js:538:15)
at Function.Module._load (module.js:468:25)
at Module.require (module.js:587:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/Users/david/Desktop/Node/ejemplo/server.js:2:18)
at Module._compile (module.js:643:30)
at Object.Module._extensions..js (module.js:654:10)
at Module.load (module.js:556:32)
at tryModuleLoad (module.js:499:12)
at Function.Module._load (module.js:491:3)
my server.js file is like this...
server.js:
var express = require('./config/express');
var app = express();
app.listen(3000);
module.exports = app;
console.log('Server running at http://localhost:3000/');
before doing this I run this command in the root of my app
npm install
Here is a like to a picture to show you the project folder structure I have.
I dont understand why cannot find module './config/express' while apparently the folder structure is fine.
Any idea??
I dont understand why cannot find module './config/express' while apparently the folder structure is fine.
after installing npm, you should try express installation into your project directory as
npm install express
it will create node_modules of express.
then you should use
var express = require('express');
Your server.js doesn't work because express.js file into config folder create confusion.
Change the name from express.js to init.express.js
and then it will work.
I am in the process of learning Node.js and web dev all together, I am coming from a mobile dev background and haven't coded in a few years.
I cloned a project from github and was planning on building on top of it for a learning project.
I am running npm install to add some dependencies to the project and they seem to be installing properly. They are succesfully being added to the node_modules directory as well as being added as a dependancy to package.json
However when running the app I get these errors
ReferenceError: Multer is not defined
at Object.<anonymous> (/Users/willjamieson/airdrive/app.js:26:21)
at Module._compile (module.js:556:32)
at Object.Module._extensions..js (module.js:565:10)
at Module.load (module.js:473:32)
at tryModuleLoad (module.js:432:12)
at Function.Module._load (module.js:424:3)
at Module.runMain (module.js:590:10)
at run (bootstrap_node.js:394:7)
at startup (bootstrap_node.js:149:9)
at bootstrap_node.js:509:3
There are other dependancies that are working properly within the app but those are ones that were with the project when I initially forked it.
var express = require('express');
var app = express();
var path = require('path');
var formidable = require('formidable');
var fs = require('fs');
var multer = require("multer");
var bodyParser = require("body-parser");
var Minio = require("minio");
I added multer bodyParsr and Minio those don't work everything else came with the original clone and work flawlessly when I remove the packages I installed.
Javascript is case sensitive. Your error says Multer is not defined and in your code shown you define var multer = require("multer");
Try var Multer = require("multer");
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.
Assuming your Azure App Service is Windows environment, try to include node_modules in the wwwroot.
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.
I'm trying desperately to tie in the mu2 module into Express in node.js. However, I can't seem to figure it out, and when trying to run the example using the mu2express module, I keep getting this error when trying to run:
module.js:340
throw err;
^
Error: Cannot find module 'mu2Express'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/myapp.js:1:80)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
Is this an error caused by something locally, or with the module itself? Right now, I'm using the node http module to work with mu2 exclusively, but I really want to use express is possible.
Can anyone out there help? Is there more information I should provide? I'm very new to node.js and I could use some direction if possible!
Look into consolidate:
https://github.com/visionmedia/consolidate.js/
It is made by the man behind Express himself and has support for Hogan and Handlebars.
EDIT:
You can initialize Express with this for consolidate
var express = require('express');
var cons = require('consolidate');
var app = express();
app.engine('html', cons.hogan);
app.set('view engine', 'html');
app.set('views', __dirname + '/views');
Renders will now be served from /views with HTML extension and Mustache-flavor syntax.
app.get('/', function (req, res) {
res.render('index', {msg: 'Hello world!'}
});
And a basic template, again just mustache-flavor syntax
Hello {{msg}}
You're requiring the mu2Express module from the myapp.js file, so you need to install it first.
You'll need to create a package.json file with at least the following content:
{
"name": "myProject",
"version": "0.0.1",
"dependencies": {
"mu2express": "~0.0.1"
}
}
And I'm not sure, that the examples are good for this project, you may need to require mu2express instead of mu2Express.