CODEWITHSUNDEEP
javascriptnode.js
Danny Fox
Danny Fox

Reputation: 40699

nodejs load file

I want to load test.txt with nodejs. 

var fs = require('fs');
fs.readFile('./test.txt', function (err, data) {
  if (err) {
    throw err; 
  }
  console.log(data);
});

The path of the server is C:\server\test\server.js. The test.txt is located in the same directory, but I get this error: Error: ENOENT, no such file or directory 'C:\Users\User\test.txt'

Upvotes: 71

Views: 111616

Answers (6)

Shamshirsaz.Navid
Shamshirsaz.Navid

Reputation: 2362

Use path and fs:

const fs = require("fs");
const pth = require("path");

Sync:

let data = fs.readFileSync(pth.join(__dirname,"file.txt"));
console.log(data + "");

A-Sync:

fs.readFile(pth.join(__dirname,"file.txt"), (err, data) => {
    console.log(data + "");
});

And that; If you need to read the file continuously and send it to the client and the file size is not large, you may be able to keep a copy of it:

const exp = require("express");
const app = exp();
const fs = require("fs");
const pth = require("path");

let file = "";
app.get("/file", (q, r) => {
    if (file === "")
        file = fs.readFileSync(pth.join(__dirname,"file.txt")) + "";

    r.writeHead(200, { "Content-Type": "text/plain" });
    r.write(file);
    r.end();
});

Upvotes: 3

nirmal
nirmal

Reputation: 51

If it's in same directory it should work. I have tested with the same code, with a file name.txt and it's working fine:

var fs = require('fs');
fs.readFile('./test.txt', function (err, data) {
  if (err) {
    throw err;
  }
  console.log(data.toString());
});

Upvotes: 0

Michael Cole
Michael Cole

Reputation: 16207

With Node 0.12, it's possible to do this synchronously now:

  var fs = require('fs');
  var path = require('path');

  // Buffer mydata
  var BUFFER = bufferFile('../test.txt');

  function bufferFile(relPath) {
    return fs.readFileSync(path.join(__dirname, relPath)); // zzzz....
  }

fs is the file system. readFileSync() returns a Buffer, or string if you ask.

fs correctly assumes relative paths are a security issue. path is a work-around.

To load as a string, specify the encoding:

return fs.readFileSync(path,{ encoding: 'utf8' });

Upvotes: 22

Rob W
Rob W

Reputation: 348962

Paths in Node are resolved relatively to the current working directory. Prefix your path with __dirname to resolve the path to the location of your Node script.

var fs = require('fs');
fs.readFile( __dirname + '/test.txt', function (err, data) {
  if (err) {
    throw err; 
  }
  console.log(data.toString());
});

Upvotes: 92

samccone
samccone

Reputation: 10926

so if it is in the same directory just do this

 fs.readFile(__dirname+'/foo.txt',function(e,d){console.log(d)})

Upvotes: 1

pimvdb
pimvdb

Reputation: 154818

You should use __dirname to get the directory name the file is located instead of the current working directory:

fs.readFile(__dirname + "/test.txt", ...);

Upvotes: 6

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