Require is not defined after installed nodejs

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Node.js is a stand-alone environment for running JavaScript. It is not a browser extension.

To run Node.js code, save it in a file with a .js file extension, then run it with:

node yourFile.js

If you want Node.js code and browser code to interact then the typical way is to write a server in Node.js that hosts a web service. Express.js is a popular way to do this. You can then use Ajax to make HTTP requests to that web service.

For bi-directional communication (as opposed to the request/response of Ajax) look at Socket.io.

I just want it to be local storage, so I do not want to share the datas between the users, I just want to interact with there own local storage datas.

If you want to use the localStorage API provided by browsers, then do so.

localStorage doesn’t need Node.js. It doesn’t need the fs module that is built into Node.js. It doesn’t need the require method that is part of the CommonJS module specification.

You can’t muck around freely on the user’s file system from code running in the browser. That would be a huge security problem.

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