nodejs load file
Javascriptnode.jsJavascript Problem Overview
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'
Javascript Solutions
Solution 1 - Javascript
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());
});
Solution 2 - Javascript
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' });
Solution 3 - Javascript
You should use __dirname
to get the directory name the file is located instead of the current working directory:
fs.readFile(__dirname + "/test.txt", ...);
Solution 4 - Javascript
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();
});
Solution 5 - Javascript
so if it is in the same directory just do this
fs.readFile(__dirname+'/foo.txt',function(e,d){console.log(d)})
Solution 6 - Javascript
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());
});