check if file exist js code example

Example 1: node check if file exists

const fs = require("fs"); // Or `import fs from "fs";` with ESM
if (fs.existsSync(path)) {
    // Do something
}

Example 2: javascript check if file exists on server

function doesFileExist(urlToFile) {
    var xhr = new XMLHttpRequest();
    xhr.open('HEAD', urlToFile, false);
    xhr.send();
     
    if (xhr.status == "404") {
        return false;
    } else {
        return true;
    }
}

Example 3: javascript file exists check

// checking existence of file synchronously
function doesFileExist(urlToFile) {
    var xhr = new XMLHttpRequest();
    xhr.open('HEAD', urlToFile, false);
    xhr.send();
     
    return xhr.status !== 404;
}

Example 4: use node js to check if a json file exists

const fs = require('fs')

const path = './file.txt'

try {
  if (fs.existsSync(path)) {
    //file exists
  }
} catch(err) {
  console.error(err)
}

Example 5: js check file exist

import fs from 'fs';

const path = './file.txt';

try {
  if (fs.existsSync(path)) {
    //file exists
  }
} catch(err) {
  console.error(err);
}

Example 6: use node js to check if a json file exists

const fs = require('fs')

const path = './file.txt'
//Async method
fs.access(path, fs.F_OK, (err) => {
  if (err) {
    console.error(err)
    return
  }

  //file exists
})