require is not defined Node js

Question

Just started working with Node js  In my app js file  I am doing something like this   app js  var http   require  http     http createServer function  request  response      response writeHead 200    Content-Type    text plain       response end  Am I really running a server         listen 8080   127 0 0 1     console log  running server       When I m in my terminal and run node app js  the console spits out  running server    but in my browser I get  Uncaught ReferenceError  require is not defined   Can someone explain to me why in the terminal  it works correctly but in the browser  it doesn t    I am using the node s http-server to serve my page

User · Answer

As Abel said  ES Modules in Node  gt   14 no longer have require by default  If you want to add it  put this code at the top of your file  import   createRequire   from  module   const require   createRequire import meta url    Source  https   nodejs org api modules html modules module createrequire filename

User · Answer

Node JS is a server-side technology  not a browser technology  Thus  Node-specific calls  like require    do not work in the browser   See browserify or webpack if you wish to serve browser-specific modules from Node

User · Answer

To supplement what everyone else has said above  your js file is being read on the client side when you have a path to it in your HTML file  At least that was the problem for me  I had it as a script in my  tag in my index html Hope this helps

User · Answer

In the terminal  you are running the node application and it is running your script   That is a very different execution environment than directly running your script in the browser   While the Javascript language is largely the same  both V8 if you re running the Chrome browser   the rest of the execution environment such as libraries available are not the same   node js is a server-side Javascript execution environment that combines the V8 Javascript engine with a bunch of server-side libraries   require   is one such feature that node js adds to the environment    So  when you run node in the terminal  you are running an environment that contains require     require   is not a feature that is built into the browser   That is a specific feature of node js  not of a browser   So  when you try to have the browser run your script  it does not have require     There are ways to run some forms of node js code in a browser  but not all     For example  you can get browser substitutes for require   that work similarly  though not identically    But  you won t be running a web server in your browser as that is not something the browser has the capability to do      You may be interested in browserify which lets you use node-style modules in a browser using require   statements

User · Answer

Point 1  Add require   function calling line of code only in the app js file or main js file  Point 2  Make sure the required package is installed by checking the pacakage json file  If not updated  run  quot npm i quot

User · Answer

This can now also happen in Node js as of version 14   It happens when you declare your package type as module in your package json  If you do this  certain CommonJS variables can t be used  including require   To fix this  remove  type    module  from your package json and make sure you don t have any files ending with  mjs

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