Collectives™ on Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most.

Teams

Q&A for work

Connect and share knowledge within a single location that is structured and easy to search.

Sorry for so dumb question,

How i can in NodeJS read from file string by string some value, for example - url, and do operation with each string eventually?

var contents = fs.readFileSync('test.txt', 'utf8');
and what then? 
It's need for browserstack+selenium testing. 
I want run some links one-by-one, from file and do something with them. 
Changed code below: 
console.log(lines[i++])
line = (lines[i++])
driver.get(line);
driver.getCurrentUrl()
                .then(function(currentUrl) {
                   console.log(currentUrl);
But it works once.
var str=fs.readFileSync('test.txt');
str.split(/\n/).forEach(function(line){})
C:\nodejstest>node test1.js
C:\nodejstest\test1.js:57
str.split(/\n/).forEach(function(line){
TypeError: str.split is not a function
    at Object.<anonymous> (C:\nodejstest\test1.js:57:5)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)
    at startup (node.js:142:18)
    at node.js:939:3
Works!
Much thanx!
Another (simpler) method would be to read the entire file into a buffer, convert it to a string, split the string on your line-terminator to produce an array of lines, and then iterate over the array, as in:
var buf=fs.readFileSync(filepath);
buf.toString().split(/\n/).forEach(function(line){
  // do something here with each line
read file with readable stream and do your operation when you find '\n'.
var fs=require('fs');
var readable = fs.createReadStream("data.txt", {
    encoding: 'utf8',
    fd: null
var lines=[];//this is array not a string!!!
readable.on('readable', function() {
    var chunk,tmp='';
    while (null !== (chunk = readable.read(1))) {
        if(chunk==='\n'){
            lines.push(tmp);
            tmp='';
        //    this is how i store each line in lines array
        }else
            tmp+=chunk;
// readable.on('end',function(){
//     console.log(lines);    
// });
readable.on('end',function(){
    var i=0,len=lines.length;
    //lines is #array not string
    while(i<len)
        console.log(lines[i++]);
See if it works for you.
                you can see.... lines is not a string ... that's an array of length = number of lines in the file!!!!
– vkstack
                Mar 28, 2016 at 19:33
        
Thanks for contributing an answer to Stack Overflow!
Please be sure to answer the question. Provide details and share your research!
But avoid …
Asking for help, clarification, or responding to other answers.
Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.