Question 330127 in Javascript Question posted in
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Javascript – Local Storage is not defined?

import User from '../modal/Model.js'
import { createSecretToken } from '../util/SecretToken.js';

export const Signup = async (req, res, next) => {
  // console.log(req.body)
  try {
    const { email, password, username, createdAt } = req.body;
    const existingUser = await User.findOne({ email });
    
    if (existingUser) {
      return res.json({ message: "User already exists" });
    }
    const user = await User.create({ email, password, username, createdAt });
    console.log(user._id)
    const token = createSecretToken(user._id);
    console.log(token)
    localStorage.setItem('token', token);
    res
      .status(201)
      .json({ message: "User signed in successfully", success: true, user });
    next();

  }catch (error) {
    console.error(error);
  }
};

I am trying to store the token key in localStorage but it showing local stroage is not define.
As in above jsx component I am trying store it in localStorage for auth.

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2

Answers


  1. 0

    LocalStorage is something present in browsers available in the window object and it seems like you are using nodeJS environment.

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  2. 0

    Node.js is not a browser-based code environment. Usually, web browsers (like Google Chrome, Safari, FireFox, etc.) use localStorage to store small chunks of data in the user’s computer securely on the website.

    In browsers, when you use localStorage like the following example:

    localStorage.setItem("myKey", "myValue");

    This is a built-in function that creates a file to that website’s domain, storing whatever the developer wants in that file to save for later.

    Now, because Node.js is not a web browser, it has no built-in way of storing data for later. The creators of Node.js have not fully implemented localStorage as a default method yet, because there is currently no reason to do so.

    There are many ways to mimic this method. Here are 2 examples to store data in Node.js:

    Example 1

    For Example 1 I’m using the package fs to create a file called localStorage.json (you can call this whatever you want though) and I will create my own function to write JSON data to that file the same way localStorage would.

    const fs = require("fs");

function storeData(key, value) {
  if (!fs.existsSync("localStorage.json")) fs.writeFileSync("localStorage.json", "{}");

  const defaultStorage = JSON.parse(fs.readFileSync("localStorage.json"));
  defaultStorage[key] = value;
  fs.writeFileSync("localStorage.json", JSON.stringify(defaultStorage));
}

function readData() {
  const storage = JSON.parse(fs.readFileSync("localStorage.json") || "{}");
  return storage;
}

// Example of these custom methods

storeData("key1", "foo_bar");

readData()["key1"];
// Returns: "foo_bar"

    Example 2

    For this example, I’ll use the NPM package node-localstorage. This package allows you to use localStorage the same exact way you would in your browser.

    const LocalStorage = require("node-localstorage").LocalStorage;

// This package also uses files stored on your computer to function. You will need to specify an empty directory/folder to put the storage data in.
localStorage = new LocalStorage("./path/to/dir");

// Then, use it the same way you would in a web browser.

localStorage.setItem("key1", "foo_bar");

localStorage["key1"];
// Returns: "foo_bar"
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