Is there a way to determine if Vue is currently in development mode?

Question

Is there a way to determine if Vue is currently in development mode?

Whenever I run my Vue application, the console output indicates:

The running environment is development mode.
Make sure to switch to production mode for deployment.
For more tips, visit https://vuejs.org/guide/deployment.html

Now, I am looking to verify if Vue is in development mode directly from within my templates using:

console.log("The mode is " + process.env.NODE_ENV)

However, it only displays undefined. Is there an alternative method to determine NODE_ENV in Vue?

In my webpack configuration, this section exists:

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = '#source-map'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      compress: {
        warnings: false
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    })
  ])
}

Additionally, could be relevant that I utilize TypeScript, and included this type declaration:

declare var process: {
    env: {
        NODE_ENV: string
    }
}

typescript webpack vue.js

Answer 1

Answer №1

For those who initiated the project with vue-cli (using default webpack), the following code snippet should be effective:

  connection: process.env.NODE_ENV === 'development'
    ? 'ws://localhost:5000'
    : 'wss://myawsomeproject.org'

Answer 2

For those who initiated the project with vue-cli (using default webpack), the following code snippet should be effective:

  connection: process.env.NODE_ENV === 'development'
    ? 'ws://localhost:5000'
    : 'wss://myawsomeproject.org'

Answer 3

Answer №2

When working on my Vue projects, I rely heavily on Webpack. One important check I always perform is to see if the webpackHotUpdate variable is present.

 if (webpackHotUpdate) {
      console.log('In Dev Mode');
 }

This variable can be found in the window object when the webpack development server is up and running.

Answer 4

When working on my Vue projects, I rely heavily on Webpack. One important check I always perform is to see if the webpackHotUpdate variable is present.

 if (webpackHotUpdate) {
      console.log('In Dev Mode');
 }

This variable can be found in the window object when the webpack development server is up and running.

Answer 5

Answer №3

Although this question is dated, it could prove valuable for VueJS beginners to learn about a solution I recently discovered in the latest version of Vue (3.11):

In development mode, the property Vue.config.devtools is set to true, while in production mode it is set to false!

Answer 6

Although this question is dated, it could prove valuable for VueJS beginners to learn about a solution I recently discovered in the latest version of Vue (3.11):

In development mode, the property Vue.config.devtools is set to true, while in production mode it is set to false!

Answer 7

Answer №4

To easily check the environment in your Vue 3 and Vite projects, simply add this code snippet to any of your js or vue files:

console.log(import.meta.env.DEV)
console.log(import.meta.env.PROD)

This will output a boolean value based on the current environment settings.

Answer 8

To easily check the environment in your Vue 3 and Vite projects, simply add this code snippet to any of your js or vue files:

console.log(import.meta.env.DEV)
console.log(import.meta.env.PROD)

This will output a boolean value based on the current environment settings.

Answer 9

Answer №5

One of the simplest approaches is to validate the window.location within your Vue component. Here's an example:

if (window.location.href === 'YOUR DEVELOPMENT URL') {
    //initialize default form values
}

Answer 10

One of the simplest approaches is to validate the window.location within your Vue component. Here's an example:

if (window.location.href === 'YOUR DEVELOPMENT URL') {
    //initialize default form values
}

Answer 11

Answer №6

Utilizing a .env file serves as a standard method for configuring environmental variables across various stacks. It's practical to implement this in Vue instead of trying to create something from scratch.

Let's conduct a brief test to explore the conditions and choices available to you.

To build your project, use this command:

vue-cli-service build

.env file:

#.env
NODE_ENV=development
DDD=development
VUE_APP_NODE_ENV=development

Vue component:

mounted() {
    console.log(process.env.NODE_ENV); // OUTPUT: production
    console.log(process.env.DDD); // OUTPUT: undefined
    console.log(process.env.VUE_APP_NODE_ENV); // OUTPUT: development
},

NODE_ENV is determined by vue-cli-service. You can create multiple .env files and utilize

vue-cli-service build --mode staging

to implement different configurations.

There are environment variables utilized during the build process and client-side environment variables used within the component code. Therefore, using something like DDD in your client-side code will be disregarded by Vue.

You have the ability to establish your own environment variable prefixed with VUE_APP_ and integrate them into your client-side code for any evaluations. Check out the documentation reference. VUE_APP_NODE_ENV will perform effectively in our assessment.

NOTE

Relying on URL parsing may not always be the optimal solution. In case you utilize something similar to

window.location.href.indexOf("localhost")

, it might fail when dealing with 127.0.0.1. In some instances, running the project on a Fully Qualified Domain Name (FQDN) also poses issues for such checks.

Answer 12

Utilizing a .env file serves as a standard method for configuring environmental variables across various stacks. It's practical to implement this in Vue instead of trying to create something from scratch.

Let's conduct a brief test to explore the conditions and choices available to you.

To build your project, use this command:

vue-cli-service build

.env file:

#.env
NODE_ENV=development
DDD=development
VUE_APP_NODE_ENV=development

Vue component:

mounted() {
    console.log(process.env.NODE_ENV); // OUTPUT: production
    console.log(process.env.DDD); // OUTPUT: undefined
    console.log(process.env.VUE_APP_NODE_ENV); // OUTPUT: development
},

NODE_ENV is determined by vue-cli-service. You can create multiple .env files and utilize

vue-cli-service build --mode staging

to implement different configurations.

There are environment variables utilized during the build process and client-side environment variables used within the component code. Therefore, using something like DDD in your client-side code will be disregarded by Vue.

You have the ability to establish your own environment variable prefixed with VUE_APP_ and integrate them into your client-side code for any evaluations. Check out the documentation reference. VUE_APP_NODE_ENV will perform effectively in our assessment.

NOTE

Relying on URL parsing may not always be the optimal solution. In case you utilize something similar to

window.location.href.indexOf("localhost")

, it might fail when dealing with 127.0.0.1. In some instances, running the project on a Fully Qualified Domain Name (FQDN) also poses issues for such checks.

Answer 13

Answer №7

Consider utilizing .env files for managing environment variables.

To define env variables, you can create the following files within your project's root directory:

.env # always loaded .env.local # always loaded but not tracked by git .env.[mode] # loaded only in specified mode .env.[mode].local # loaded only in specified mode and not tracked by git

Additionally,

Env Loading Hierarchy

An env file designed for a particular mode (e.g. .env.production) takes precedence over a general one (e.g. .env).

Find more information in the documentation: https://cli.vuejs.org/guide/mode-and-env.html#environment-variables

Answer 14

Consider utilizing .env files for managing environment variables.

To define env variables, you can create the following files within your project's root directory:

.env # always loaded .env.local # always loaded but not tracked by git .env.[mode] # loaded only in specified mode .env.[mode].local # loaded only in specified mode and not tracked by git

Additionally,

Env Loading Hierarchy

An env file designed for a particular mode (e.g. .env.production) takes precedence over a general one (e.g. .env).

Find more information in the documentation: https://cli.vuejs.org/guide/mode-and-env.html#environment-variables

Answer 15

Answer №8

Vue's method of checking whether it is in development mode:

if (process.env.NODE_ENV !== 'production' &&
  process.env.NODE_ENV !== 'test' &&
  typeof console !== 'undefined'
)

Find the original code on GitHub

Note: I excluded a particular check from the code, as it is specifically for turning off the "production tip" when Vue is in development mode.

Gene Parcellano's answer is effective with Webpack, but this alternative could be more reliable.

Edit:

You can combine both solutions by doing the following:

if (
  window.webpackHotUpdate || (
    process.env.NODE_ENV !== "production" &&
    process.env.NODE_ENV !== "test" &&
    typeof console !== "undefined"
  )
)

Answer 16

Vue's method of checking whether it is in development mode:

if (process.env.NODE_ENV !== 'production' &&
  process.env.NODE_ENV !== 'test' &&
  typeof console !== 'undefined'
)

Find the original code on GitHub

Note: I excluded a particular check from the code, as it is specifically for turning off the "production tip" when Vue is in development mode.

Gene Parcellano's answer is effective with Webpack, but this alternative could be more reliable.

Edit:

You can combine both solutions by doing the following:

if (
  window.webpackHotUpdate || (
    process.env.NODE_ENV !== "production" &&
    process.env.NODE_ENV !== "test" &&
    typeof console !== "undefined"
  )
)

Answer 17

Answer №9

Tip for using Vue 3 with Vite: You can achieve this by:

if (import.meta.env.PROD) {
    console.log('PRODUCTION!')
}

to show for production, and

if (import.meta.env.DEV) {
    console.log('DEVELOPMENT!');
}

for development.

For further information, check out: https://vitejs.dev/guide/env-and-mode.html

Answer 18

Tip for using Vue 3 with Vite: You can achieve this by:

if (import.meta.env.PROD) {
    console.log('PRODUCTION!')
}

to show for production, and

if (import.meta.env.DEV) {
    console.log('DEVELOPMENT!');
}

for development.

For further information, check out: https://vitejs.dev/guide/env-and-mode.html

Answer 19

Answer №10

The proper method for achieving this in Vue 3 is through the use of import.meta.env.MODE.

For more information, visit: https://vitejs.dev/guide/env-and-mode.html

Answer 20

The proper method for achieving this in Vue 3 is through the use of import.meta.env.MODE.

For more information, visit: https://vitejs.dev/guide/env-and-mode.html

Answer 21

Answer №11

When using pug and wanting to conditionally add elements to a component, I found a solution by setting the options.data property of pug-plain-loader in my webpack.config.js. Here is an example of how I configured the loader:


{
  resourceQuery: /^\?vue/,
  use: [
    {
      loader: 'pug-plain-loader',
      options: {
          // Detecting mode in webpack configuration
          data: { mode: process.env['PRODUCTION'] ? 'production' : 'development' },
        },
      },
    ],
  },
}

This is the link to the complete webpack.config.js file I used: https://github.com/SuperuserLabs/thankful/blob/5913d9d0bb02e6d2f3b88c541477dc557caa4148/webpack.config.js#L76-L88

After configuring this, I was able to do the following:

if mode === 'development'
  | Only shown in development mode

For a more general approach, I initially found it challenging but with expertise in Webpack, it could be achieved effortlessly.

Answer 22

When using pug and wanting to conditionally add elements to a component, I found a solution by setting the options.data property of pug-plain-loader in my webpack.config.js. Here is an example of how I configured the loader:


{
  resourceQuery: /^\?vue/,
  use: [
    {
      loader: 'pug-plain-loader',
      options: {
          // Detecting mode in webpack configuration
          data: { mode: process.env['PRODUCTION'] ? 'production' : 'development' },
        },
      },
    ],
  },
}

This is the link to the complete webpack.config.js file I used: https://github.com/SuperuserLabs/thankful/blob/5913d9d0bb02e6d2f3b88c541477dc557caa4148/webpack.config.js#L76-L88

After configuring this, I was able to do the following:

if mode === 'development'
  | Only shown in development mode

For a more general approach, I initially found it challenging but with expertise in Webpack, it could be achieved effortlessly.

Answer 23

Answer №12

In my practice, I often rely on the following conditions:

if(window.location.href.indexOf("localhost") >= 0) {
  // Executing Development mode specific code    
}

Alternatively:

if(window.location.href.indexOf("localhost") < 0) {
  // Executing Production mode specific code    
}

By utilizing a search for a portion of the development URL like localhost, the need for specificity in the rest of the address is reduced. This approach is versatile and can be applied throughout your project, unlike relying solely on process.env.NODE_ENV which may not function as expected in certain files such as index.html.

Answer 24

In my practice, I often rely on the following conditions:

if(window.location.href.indexOf("localhost") >= 0) {
  // Executing Development mode specific code    
}

Alternatively:

if(window.location.href.indexOf("localhost") < 0) {
  // Executing Production mode specific code    
}

By utilizing a search for a portion of the development URL like localhost, the need for specificity in the rest of the address is reduced. This approach is versatile and can be applied throughout your project, unlike relying solely on process.env.NODE_ENV which may not function as expected in certain files such as index.html.

Is there a way to determine if Vue is currently in development mode?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

Answer №12

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