node if file exists

1const fs = require("fs"); // Or `import fs from "fs";` with ESM
2if (fs.existsSync(path)) {
3    // Do something
4}

1const fs = require("fs"); // Or `import fs from "fs";` with ESM
2if (fs.existsSync(path)) {
3    // Do something
4}
5

1const fs = require('fs');
2
3let file = '../path/to/chad_warden.mpeg';
4
5// async
6const fileExists = (file) => {
7    return new Promise((resolve) => {
8        fs.access(file, fs.constants.F_OK, (err) => {
9            err ? resolve(false) : resolve(true)
10        });
11    })
12}
13
14// sync
15const fileExistsSync = (file) => {
16    try {
17        fs.accessSync(file, fs.constants.R_OK | fs.constants.W_OK);
18        return true;
19      } catch (err) {
20        return false;
21      }
22}

1function executeIfFileExist(src, callback) {
2    var xhr = new XMLHttpRequest()
3    xhr.onreadystatechange = function() {
4        if (this.readyState === this.DONE) {
5            callback()
6        }
7    }
8    xhr.open('HEAD', src)
9}