Node package 'node-fetch' SyntaxError: Unexpected identifier - node.js

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

Related

OKTA express middleware - TypeError [ERR_INVALID_ARG_TYPE]: The "original" argument must be of type Function. Received type undefined

Just including the following in an app causes the following error.
const { ExpressOIDC } = require('#okta/oidc-middleware');
Full error:
$ node app.js
internal/util.js:257
throw new ERR_INVALID_ARG_TYPE('original', 'Function', original);
^
TypeError [ERR_INVALID_ARG_TYPE]: The "original" argument must be of type Function. Received type undefined
at promisify (internal/util.js:257:11)
at Object.<anonymous> (/dev/tmpOidc/node_modules/jose/lib/jwk/key/rsa.js:13:25)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object.<anonymous> (/dev/tmpOidc/node_modules/jose/lib/jwk/import.js:9:16)
Steps to reproduce
1. Create a new node app and add express and Okta's oidc middleware
npm init
npm install express --save
npm install --save #okta/oidc-middleware
Create app.js
const express = require('express')
const app = express()
const port = 3000
// const { ExpressOIDC } = require('#okta/oidc-middleware');
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))
Run it
node app.js
See how it runs. Finally, uncomment and include the line that sets up the OIDC middleware.
const { ExpressOIDC } = require('#okta/oidc-middleware');
Run the app again and I get the error above shows up.
Solved: Need to run with node v12 not v10
I just published a YouTube video that shows you how to use Okta's OIDC Middleware.
You can find the steps I used here. To summarize:
Create a new project with express-generator and pug: npx express-generator --view=pug
Add a new web app on Okta with http://localhost:3000/callback as the login redirect URI
Install Schematics CLI: npm install -g #angular-devkit/schematics-cli
Install and run OktaDev Schematics with your Okta values:
npm i #oktadev/schematics
schematics #oktadev/schematics:add-auth --issuer=$issuer --clientId=$clientId --
clientSecret=$clientSecret
Start your app and authenticate with Okta: npm start
You can see the result of these steps in this GitHub repo.
Solved. When I posted my question I should've included system information such as the version of Node. I had v10.8.0. Once I updated to v12 the typeerror went away.

Node.js Express JS - Cannot find module './config/express'

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.

NPM Install is not working. Getting Reference Errors

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");

ES6 import statements not working in Node v8.4.0

I'm using the latest version of Node.js that is v8.4.0. However, in the import and export statements, I'm getting errors:
import express from 'express';
^^^^^^
SyntaxError: Unexpected token import
at createScript (vm.js:74:10)
at Object.runInThisContext (vm.js:116:10)
at Module._compile (module.js:537:28)
at Object.Module._extensions..js (module.js:584:10)
at Module.load (module.js:507:32)
at tryModuleLoad (module.js:470:12)
at Function.Module._load (module.js:462:3)
at Function.Module.runMain (module.js:609:10)
at startup (bootstrap_node.js:158:16)
at bootstrap_node.js:598:3
What Node.js version should I install in order to work these ES6 codes?
OS - Ubuntu 17.04
node -v: v8.4.0
npm -v: 5.3.0
One way that I have worked around this issue...
Install babel stuff for the project:
$ npm install babel-register babel-preset-es2015 --save-dev
Create an index.js file that is the main entry point into the app:
// index.js
// by requiring `babel/register`, all of our successive `require`s will be Babel'd
require('babel-register')({
presets: [ 'es2015' ]
});
require('./server');
Then, create a file called server.js that will have your normal index code:
// server.js
import express from 'express';
var app = express()
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(3000, () => console.log('Example app listening on port 3000!'))
And run:
$ node index.js
const express = require('express');
is the right syntax as some es6 features ie import express from express is currently not available with node!

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

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.

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