FS 模块读取 CSV 文件

Question

I'm new with node js and I tried to use the module "fs" but I have always the same error that I can't understand: " Cannot find module 'fs' ". The code is:

     const fs = require('fs');
      fs.createReadStream("data/dataset.csv", "utf8", function(error, data)
        {
          data = d3.tsv.parse(data);
          console.log(JSON.stringify(data));
        }
      );

Can someone help me? Thank you

Answer 1

You're using fs wrong!

First of all you're not using stream properly.

Also you don't need stream for this task. (if you just need to read file)

Try this instead:

fs.readFile("data/dataset.csv", "utf8", (err, data) => {
  if (err) throw err;
  data = d3.tsv.parse(data);
  console.log(JSON.stringify(data));
});

Answer 2

By the assumption that you are using webpack I don't think that it is possible to require fs in the browser. Webpack take your code and bundle it, then it is "usually" sent to a browser. Although webpack is reading and using node.js code it will ultimately run in the browser which does not have the required 'fs' module and is not a node.js environment.

I am not sure what you are trying to achieve.

With webpack it is possible to change the configuration and have custom file loaded as a step. You should take a look at Adding a csv file to a webpack build

Or Webpack Express Cannot Resolve Module 'fs', Request Dependency is Expression