read file in javascript code example

Example 1: read file javascript

// As with JSON, use the Fetch API & ES6
fetch('something.txt')
  .then(response => response.text())
  .then(data => {
  	// Do something with your data
  	console.log(data);
  });

Example 2: how to load localt ext file in js

const fileUrl = '' // provide file location

fetch(fileUrl)
   .then( r => r.text() )
   .then( t => console.log(t) )

Example 3: javascript read file lines into array vanilla

const fileList = event.target.files;
let fileContent = "";

const fr = new FileReader();
fr.onload = () => {
  fileContent = fr.result;
  console.log('Commands', fileContent);
}

fr.readAsText(fileList[0]);

Example 4: how to read a file in javascript

fetch('file.txt')
  .then(response => response.text())
  .then(text => console.log(text))
  // outputs the content of the text file

Example 5: Read files in JavaScript

function readImage(file) {  //function readImage(file) {
  // Check if the file is an image.
  if (file.type && !file.type.startsWith('image/')) {
    console.log('File is not an image.', file.type, file);
    return;
  }

  const reader = new FileReader();
  reader.addEventListener('load', (event) => {
    img.src = event.target.result;
  });
  reader.readAsDataURL(file);
} Check if the file is an image.  if (file.type && !file.type.startsWith('image/')) {    console.log('File is not an image.', file.type, file);    return;  }  const reader = new FileReader();  reader.addEventListener('load', (event) => {    img.src = event.target.result;  });  reader.readAsDataURL(file);}