check if dir exists nodejs code example

Example 1: how to check if a folder exists in node js

const fs = require("fs")

fs.access("./directory-name", function(error) {
  if (error) {
    console.log("Directory does not exist.")
  } else {
    console.log("Directory exists.")
  }
})

Example 2: node check if file exists

const fs = require('fs');

let file = '../path/to/chad_warden.mpeg';

// async
const fileExists = (file) => {
    return new Promise((resolve) => {
        fs.access(file, fs.constants.F_OK, (err) => {
            err ? resolve(false) : resolve(true)
        });
    })
}

// sync
const fileExistsSync = (file) => {
    try {
        fs.accessSync(file, fs.constants.R_OK | fs.constants.W_OK);
        return true;
      } catch (err) {
        return false;
      }
}

Example 3: how to check if var exists python

# for local
if 'myVar' in locals():
  # myVar exists.
# for globals
if 'myVar' in globals():
  # myVar exists.