Global Variables in Vue 3

—

### **1. Using `app.config.globalProperties` (Recommended for Vue Apps)**

import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

app.config.globalProperties.$apiUrl = 'https://api.example.com';

app.mount('#app');

#### **Usage in Components**

<script setup>
import { getCurrentInstance } from 'vue';

const { proxy } = getCurrentInstance();
console.log(proxy.$apiUrl); // 'https://api.example.com'
</script>

—

### **2. Using `import.meta.env` with `.env` File (Recommended for Vite)**
Create an `.env` file in the root of your project:

VITE_API_URL=https://api.example.com

Then access it in your Vue component:

console.log(import.meta.env.VITE_API_URL); // 'https://api.example.com'

—

### **3. Using `provide/inject` (Scoped Global Variables)**
Define it in `main.js`:

import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);
app.provide('apiUrl', 'https://api.example.com');

app.mount('#app');

Use it in a component:

<script setup>
import { inject } from 'vue';

const apiUrl = inject('apiUrl');
console.log(apiUrl); // 'https://api.example.com'
</script>

—

### **4. Using a Separate Config File**
Create a `config.js` file:

export const API_URL = 'https://api.example.com';

Then import it wherever needed:

import { API_URL } from '@/config.js';
console.log(API_URL); // 'https://api.example.com'

—

### **Best Approach?**
– **Use `.env` with `import.meta.env`** for environment-specific variables (Vite-based projects).
– **Use `globalProperties`** if you need a global variable accessible throughout the app.
– **Use `provide/inject`** if you want scoped global variables.
– **Use a separate `config.js` file** if you need a structured configuration approach.

Which approach suits your setup best? 🚀

—

### **1. Using `window.location.hostname` (Best for Simple Checks)**
Modify `main.js`:

import { createApp } from 'vue';
import App from './App.vue';

const isLocal = window.location.hostname === 'localhost';
const API_URL = isLocal ? 'http://localhost:8000/api' : 'https://api.example.com';

const app = createApp(App);
app.config.globalProperties.$apiUrl = API_URL;

app.mount('#app');

#### **Usage in Components**

<script setup>
import { getCurrentInstance } from 'vue';

const { proxy } = getCurrentInstance();
console.log(proxy.$apiUrl);
</script>

—

### **2. Using `.env` Variables (Best for Vite & Environment-Specific Configs)**
Define in `.env`:

VITE_LOCAL_API_URL=http://localhost:8000/api
VITE_LIVE_API_URL=https://api.example.com

Create a `config.js` file:

const isLocal = window.location.hostname === 'localhost';
export const API_URL = isLocal 
  ? import.meta.env.VITE_LOCAL_API_URL 
  : import.meta.env.VITE_LIVE_API_URL;

Use in components:

import { API_URL } from '@/config.js';
console.log(API_URL);

—

### **3. Using `provide/inject` (Scoped Approach)**
Modify `main.js`:

import { createApp } from 'vue';
import App from './App.vue';

const isLocal = window.location.hostname === 'localhost';
const API_URL = isLocal ? 'http://localhost:8000/api' : 'https://api.example.com';

const app = createApp(App);
app.provide('apiUrl', API_URL);

app.mount('#app');

Use in a component:

<script setup>
import { inject } from 'vue';

const apiUrl = inject('apiUrl');
console.log(apiUrl);
</script>

—

### **Which Approach to Choose?**
– ✅ **Use `window.location.hostname`** for a quick check.
– ✅ **Use `.env` and `import.meta.env`** if you need environment-specific settings (best for Vite).
– ✅ **Use `provide/inject`** if you want the API URL to be available in a scoped manner.

Which setup are you using—Vite, Vue CLI, or something else? 🚀

If you're using **Vite** (recommended for Vue 3 projects), you can follow these steps to add and use an `.env` file.

—

### **1. Create a `.env` File**
In the root of your Vue 3 project, create a file named `.env` and add your variables:

VITE_API_URL=http://localhost:8000/api
VITE_LIVE_API_URL=https://api.example.com

> **⚠ Important:**
> – Vite requires **all environment variables** to start with `VITE_`.
> – Variables without `VITE_` won't be accessible in the frontend.

—

### **2. Use the Environment Variable in Your Code**
In your Vue components or scripts, use:

const API_URL = import.meta.env.VITE_API_URL;
console.log(API_URL); // Will output the local API URL

If you want to check if it's running on localhost and use the correct URL:

const API_URL = window.location.hostname === 'localhost'
  ? import.meta.env.VITE_API_URL
  : import.meta.env.VITE_LIVE_API_URL;

console.log(API_URL);

—

### **3. Restart the Development Server**
After adding the `.env` file, restart your development server:

npm run dev
# OR
yarn dev

Vite only loads `.env` variables **when the server starts**, so restarting is required.

—

### **4. Using `.env` in `main.js` (Global Variable)**
If you want to make the API URL globally accessible:

import { createApp } from 'vue';
import App from './App.vue';

const API_URL = window.location.hostname === 'localhost'
  ? import.meta.env.VITE_API_URL
  : import.meta.env.VITE_LIVE_API_URL;

const app = createApp(App);
app.config.globalProperties.$apiUrl = API_URL;

app.mount('#app');

#### **Usage in Components**

<script setup>
import { getCurrentInstance } from 'vue';

const { proxy } = getCurrentInstance();
console.log(proxy.$apiUrl); // Uses the correct API URL
</script>

—

### **5. Ignore `.env` in Git (Optional)**
If you don’t want to commit your `.env` file (e.g., to prevent exposing API URLs), add it to `.gitignore`:

.env

For shared environments, create an `.env.example` file without sensitive values:

VITE_API_URL=
VITE_LIVE_API_URL=

Developers can copy `.env.example` to `.env` and fill in the values.

—

### **Summary**
✅ Create a `.env` file in the root.
✅ Use `import.meta.env.VITE_YOUR_VARIABLE` in your code.
✅ Restart the server to apply changes.
✅ Optionally, ignore `.env` in Git.

Let me know if you need any modifications! 🚀

### **✅ Correct Folder Structure**

/my-vue-project
  ├── node_modules/
  ├── public/
  ├── src/
  ├── .env  ✅ (Place it here)
  ├── .gitignore
  ├── package.json
  ├── vite.config.js
  ├── index.html

### **Why Not Inside `src/`?**
– Vite automatically loads `.env` files from the **root** directory.
– Placing it in `src/` means it won't be automatically detected by Vite.
– Keeping it in the root allows better separation of environment-specific settings.

### **After Adding `.env`**
1. Restart the development server:

npm run dev
   # OR
   yarn dev

2. Access the variables in your Vue components:

console.log(import.meta.env.VITE_API_URL);

Let me know if you need more clarification! 🚀

—

### **✅ Solution 1: Ensure `config.js` Exists**
Make sure the `config.js` file actually exists in the correct location. Your project structure should look like this:

/my-vue-project
  ├── src/
  │   ├── config.js  ✅ (Make sure this file exists)
  │   ├── main.ts
  │   ├── components/
  ├── .env
  ├── package.json
  ├── vite.config.ts

If the file doesn't exist, create it inside `src/`:

// src/config.js
const isLocal = window.location.hostname === 'localhost';
export const API_URL = isLocal ? 'http://localhost:8000/api' : 'https://api.example.com';

—

### **✅ Solution 2: Check the Import Path**
In `main.ts` or any file where you're importing it, update the import statement:

import { API_URL } from './config.js'; // Use relative path
console.log(API_URL);

If your project uses **TypeScript**, rename `config.js` to `config.ts` and import it like this:

import { API_URL } from './config';

—

### **✅ Solution 3: Check Vite's Alias Configuration**
Vite uses `@` as an alias for `src/`, but it must be configured in `vite.config.ts`.

**Ensure this alias exists in `vite.config.ts`:**

import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';
import path from 'path';

export default defineConfig({
  plugins: [vue()],
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'), // Ensure this is correctly set
    },
  },
});

After making changes, **restart the Vite server**:

npm run dev
# OR
yarn dev

—

### **🔎 Recap**
✔ **Check that `src/config.js` exists.**
✔ **Use a relative import path (`./config.js`)** instead of `@/config.js`.
✔ **Ensure the `@` alias is correctly set in `vite.config.ts`.**
✔ **Restart the development server after making changes.**

Let me know if you still face issues! 🚀

—

### **✅ Solution 1: Ensure `.env` File Exists and Variables are Defined**
In the **root** of your Vue 3 project (not inside `src/`), create a `.env` file:

VITE_LOCAL_API_URL=http://localhost:8000/api
VITE_LIVE_API_URL=https://api.example.com

> **⚠ Important:**
> – In **Vite**, environment variables **must start with `VITE_`** (e.g., `VITE_APP_URL`, `VITE_API_URL`).
> – Variables like `APP_URL` (without `VITE_`) won't be available in the frontend.

—

### **✅ Solution 2: Restart Vite After Changes**
Vite **only loads environment variables at startup**.
After adding or modifying the `.env` file, restart the development server:

npm run dev
# OR
yarn dev

—

### **✅ Solution 3: Access Environment Variables Correctly**
Modify `config.ts` to use `import.meta.env` properly:

const isLocal = window.location.hostname === 'localhost';

export const API_URL = isLocal
  ? import.meta.env.VITE_LOCAL_API_URL
  : import.meta.env.VITE_LIVE_API_URL;

console.log("API URL:", API_URL); // Debug to check if it's loaded

Make sure you're **not** using `process.env.VITE_APP_URL` because **Vite uses `import.meta.env`**, not `process.env`.

—

### **✅ Solution 4: Check TypeScript Configuration**
If you're using TypeScript, TypeScript might not recognize `import.meta.env.VITE_*` by default.
Fix this by updating `env.d.ts` (create this file if it doesn’t exist):

/// <reference types="vite/client" />

interface ImportMetaEnv {
  readonly VITE_LOCAL_API_URL: string;
  readonly VITE_LIVE_API_URL: string;
}

interface ImportMeta {
  readonly env: ImportMetaEnv;
}

—

### **✅ Solution 5: Use in `main.ts` Properly**
Ensure you're importing the correct API URL in `main.ts`:

import { createApp } from 'vue';
import App from './App.vue';
import { API_URL } from './config'; // Import from config.ts

console.log("Loaded API URL:", API_URL); // Debug to check value

const app = createApp(App);
app.config.globalProperties.$apiUrl = API_URL;
app.mount('#app');

—

### **🔎 Recap**
✔ **Ensure `.env` is in the root** with `VITE_` prefixed variables.
✔ **Restart the Vite server** after modifying `.env`.
✔ **Use `import.meta.env.VITE_LOCAL_API_URL` instead of `process.env`**.
✔ **Add `env.d.ts`** if TypeScript doesn’t recognize `import.meta.env`.
✔ **Log values** to debug if the environment variables are loading correctly.

Try these fixes and let me know if the issue persists! 🚀

import { createApp } from 'vue'
import vuetify from './vuetify'
import { createPinia } from 'pinia'
import { API_URL } from '@/config'
import App from './App.vue'
import router from './router'
console.log(API_URL+"dsa");
const app = createApp(App)

app.use(createPinia())
app.use(router)
app.use(vuetify)

app.mount('#app')
API_URL undefined

—

## **✅ Step 1: Ensure `.env` File Exists in the Root Directory**
Your **`.env` file** must be placed in the **root** of your Vue project (not inside `src/`).
Create a file `.env` in your Vue project's root and add:

VITE_LOCAL_API_URL=http://localhost:8000/api
VITE_LIVE_API_URL=https://api.example.com

—

## **✅ Step 2: Modify `config.ts` to Read Environment Variables Properly**
Now, modify `config.ts` inside the `src/` folder:

const isLocal = window.location.hostname === 'localhost';

export const API_URL = isLocal
  ? import.meta.env.VITE_LOCAL_API_URL
  : import.meta.env.VITE_LIVE_API_URL;

console.log("Loaded API URL:", API_URL); // Debug to check if it's loading

—

## **✅ Step 3: Restart Vite After Adding `.env` File**
Vite **only loads environment variables when it starts**.
After adding the `.env` file, **restart the development server**:

npm run dev
# OR
yarn dev

—

## **✅ Step 4: Ensure TypeScript Recognizes `import.meta.env` (For TypeScript Projects)**
If you're using TypeScript, TypeScript might not recognize `import.meta.env`.
Fix this by adding `env.d.ts` in the `src/` folder:

/// <reference types="vite/client" />

interface ImportMetaEnv {
  readonly VITE_LOCAL_API_URL: string;
  readonly VITE_LIVE_API_URL: string;
}

interface ImportMeta {
  readonly env: ImportMetaEnv;
}

—

## **✅ Step 5: Debug `API_URL` in `main.ts`**
Modify your `main.ts` file to debug if `API_URL` is actually being loaded:

import { createApp } from 'vue';
import vuetify from './vuetify';
import { createPinia } from 'pinia';
import { API_URL } from '@/config';
import App from './App.vue';
import router from './router';

console.log("API_URL from config.ts:", API_URL); // Debugging output

const app = createApp(App);

app.use(createPinia());
app.use(router);
app.use(vuetify);

app.mount('#app');

If the console shows `undefined`, check if:
– The `.env` file exists in the **root** directory.
– You've restarted the Vite server.
– The `.env` variables are prefixed with `VITE_`.

—

## **🔎 Recap**
✔ **Ensure `.env` is in the root** with `VITE_` prefixed variables.
✔ **Restart the Vite server** after modifying `.env`.
✔ **Use `import.meta.env.VITE_LOCAL_API_URL` instead of `process.env`**.
✔ **Add `env.d.ts`** if TypeScript doesn’t recognize `import.meta.env`.
✔ **Log values** in `main.ts` to debug.

Let me know if the issue persists! 🚀

—

## **✅ Step 1: Define Variables in `.env` File**
In your Vue project **root directory**, create or update the `.env` file:

VITE_LOCAL_API_URL=http://localhost:8000/api
VITE_LIVE_API_URL=https://api.example.com

VITE_APP_NAME=My Vue App
VITE_APP_VERSION=1.0.0
VITE_CONTACT_EMAIL=support@example.com

> **⚠ Important:**
> – All variables **must start with `VITE_`** to be accessible in Vue.
> – Restart the dev server (`npm run dev`) after modifying `.env`.

—

## **✅ Step 2: Create a Config File (`config.ts`)**
Inside `src/`, create or update **`config.ts`** to fetch and store global variables:

const isLocal = window.location.hostname === 'localhost';

export const API_URL = isLocal
  ? import.meta.env.VITE_LOCAL_API_URL
  : import.meta.env.VITE_LIVE_API_URL;

export const APP_NAME = import.meta.env.VITE_APP_NAME;
export const APP_VERSION = import.meta.env.VITE_APP_VERSION;
export const CONTACT_EMAIL = import.meta.env.VITE_CONTACT_EMAIL;

console.log("API URL:", API_URL); // Debugging
console.log("App Name:", APP_NAME);
console.log("App Version:", APP_VERSION);
console.log("Contact Email:", CONTACT_EMAIL);

—

## **✅ Step 3: Use Global Variables in `main.ts`**
Now import these variables in `main.ts`:

import { createApp } from 'vue';
import vuetify from './vuetify';
import { createPinia } from 'pinia';
import { API_URL, APP_NAME, APP_VERSION, CONTACT_EMAIL } from '@/config';
import App from './App.vue';
import router from './router';

console.log("Loaded API URL:", API_URL);
console.log("Loaded App Name:", APP_NAME);
console.log("Loaded Version:", APP_VERSION);
console.log("Loaded Contact Email:", CONTACT_EMAIL);

const app = createApp(App);

// Make variables available globally
app.config.globalProperties.$apiUrl = API_URL;
app.config.globalProperties.$appName = APP_NAME;
app.config.globalProperties.$appVersion = APP_VERSION;
app.config.globalProperties.$contactEmail = CONTACT_EMAIL;

app.use(createPinia());
app.use(router);
app.use(vuetify);
app.mount('#app');

—

## **✅ Step 4: Access Global Variables in Components**
Now you can access these global variables inside **any Vue component** using `this.$apiUrl`, etc.:

<script setup>
import { API_URL, APP_NAME, APP_VERSION, CONTACT_EMAIL } from '@/config';

console.log("Using in Component:", API_URL, APP_NAME, APP_VERSION, CONTACT_EMAIL);
</script>

<template>
  <div>
    <h1>{{ APP_NAME }}</h1>
    <p>Version: {{ APP_VERSION }}</p>
    <p>API URL: {{ API_URL }}</p>
    <p>Contact: {{ CONTACT_EMAIL }}</p>
  </div>
</template>

—

## **🔎 Recap**
✔ **Use `.env` in the root directory** with `VITE_` prefix.
✔ **Create a `config.ts` file** to store global variables.
✔ **Import `config.ts` in `main.ts`** to make them globally accessible.
✔ **Use global variables in Vue components** (`this.$apiUrl` or direct imports).
✔ **Restart Vite** (`npm run dev`) after updating `.env`.

Now you can manage multiple global variables efficiently! 🚀 Let me know if you need further help. 🎯