Node - how to run app js

Question

I am very new to Node js and I tried to run a project  made by other developer  by having a command in terminal node app js  But I encountered below error  do you have any idea how to run this project   I followed few instructions here to run a project   Error logs below   Junryls-Mac-mini app junrylmaraviles  node app js   Users junrylmaraviles Desktop myfolder mysubfolder app app js 1  function  exports  require  module    filename    dirname    define  src app                                                                  ReferenceError  define is not defined     at Object  lt anonymous gt    Users junrylmaraviles Desktop myfolder mysubfolder app app js 1 63      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 Function Module runMain  module js 497 10      at startup  node js 119 16      at node js 902 3

User · Answer

Node manages dependencies ie  third party code using package json so that 3rd party modules names and versions can be kept stable for all installs of the project  This also helps keep the file be light-weight as only actual program code is present in the code repository  Whenever repository is cloned  for it to work as 3rd party modules may be used in the code   you would need to install all dependencies   Use npm install on CMD within root of the project structure to complete installing all dependencies  This should resolve all dependencies issues if dependencies get properly installed

User · Answer

you have a package json file that shows the main configuration of your project  and a lockfile that contains the full details of your project configuration such as the urls that holds each of the package or libraries used in your project at the root folder of the project       npm is the default package manager for Node js     All you need to do is call   npm install from the terminal in the root directory where you have the package json and lock file     since you are not adding any particular package to be install       it will go through the lock file and download one after the other  the required packages from their urls written in the lock file if it isnt present in the project enviroment       you make sure you edit your package json file      to give an entry point to your app          quot name quot   quot app js quot      where app js is the main script    or index js depending on the project naming convention    then you can run    Node app js or   npm start if your package json scripts has a start field config as such  quot scripts quot      quot start quot    quot Node index js quot    quot test quot    quot test quot         which is indirectly still calling your   Node app js

User · Answer

Node is complaining because there is no function called define  which your code tries to call on its very first line   define comes from AMD  which is not used in standard node development   It is possible that the developer you got your project from used some kind of trickery to use AMD in node   You should ask this person what special steps are necessary to run the code

User · Answer

Assuming I have node and npm properly installed on the machine  I would   Download the code Navigate to inside the project folder on terminal  where I would hopefully see a package json file Do an npm install for installing all the project dependencies Do an npm install -g nodemon for installing all the project dependencies Then npm start OR node app js OR nodemon app js to get the app running on local host   Hope this helps someone   use nodemon app js   nodemon is a utility that will monitor for any changes in your source and automatically restart your server

User · Answer

Just adding this  In your package json  if your  main    index js  is correctly set  Just use node          name    app      version    1 0 0      description          main    index js      scripts                      keywords          author          license    ISC      dependencies                      devDependencies

User · Answer

The code downloaded may require you to install dependencies first  Try commands in app js directory   npm install then node app js  This should install dependencies and then start the app

User · Answer

To run app js file check  main    app js  in your package json file   Then run command   node app js That should run your app and check

User · Answer

const express   require  express   const app   express   const port   3000  app get       req  res    gt  res send  Hello World      app listen port       gt  console log  Example app listening on port   port

[node.js] Node - how to run app.js?

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