For use in express.js environments. Any suggestions?
This question is related to
javascript
node.js
macos
environment-variables
On OSX I'd recommend adding export NODE_ENV=development
to your ~/.bash_profile
and/or ~/.bashrc
and/or ~/.profile
.
Personally I add that entry to my ~/.bashrc
and then have the ~/.bash_profile
~/.profile
import the contents of that file, so it's consistent across environments.
After making these additions, be sure to restart your terminal to pick up settings.
npm start --mode production
npm start --mode development
With process.env.NODE_ENV = 'production'
export NODE_ENV=production
is bad solution, it disappears after restart.
if you want not to worry about that variable anymore - add it to this file:
/etc/environment
don't use export syntax, just write (in new line if some content is already there):
NODE_ENV=production
it works after restart. You will not have to re-enter export NODE_ENV=production command anymore anywhere and just use node with anything you'd like - forever, pm2...
For heroku:
heroku config:set NODE_ENV="production"
which is actually default.
In order to have multiple environments you need all of the answers before (NODE_ENV parameter and export it), but I use a very simple approach without the need of installing anything. In your package.json just put a script for each env you need, like this:
...
"scripts": {
"start-dev": "export NODE_ENV=dev && ts-node-dev --respawn --transpileOnly ./src/app.ts",
"start-prod": "export NODE_ENV=prod && ts-node-dev --respawn --transpileOnly ./src/app.ts"
}
...
Then, to start the app instead of using npm start
use npm run script-prod
.
In the code you can access the current environment with process.env.NODE_ENV
.
Voila.
Windows CMD -> set NODE_ENV=production
Windows Powershell -> $env:NODE_ENV="production"
MAC -> export NODE_ENV=production
To not have to worry whether you are running your scripts on Windows, Mac or Linux install the cross-env package. Then you can use your scripts easily, like so:
"scripts": {
"start-dev": "cross-env NODE_ENV=development nodemon --exec babel-node -- src/index.js",
"start-prod": "cross-env NODE_ENV=production nodemon --exec babel-node -- src/index.js"
}
Massive props to the developers of this package.
npm install --save-dev cross-env
Daniel has a fantastic answer which is the better approach for the correct deployment (set and forget) process.
For those using express. You can use grunt-express-server which is fantastic as well. https://www.npmjs.org/package/grunt-express-server
in package.json:
{
...
"scripts": {
"start": "NODE_ENV=production node ./app"
}
...
}
then run in terminal:
npm start
If you are on windows. Open your cmd at right folder then first
set node_env={your env name here}
hit enter then you can start your node with
node app.js
it will start with your env setting
heroku config:set NODE_ENV="production"
It might be a chance that you have made two instances of sequelize object
for example : var con1=new Sequelize(); var con2=new Sequelize();
than also same error will occur
If you using webpack in your application, you can simply set it there, using DefinePlugin
...
So in your plugin
section, set the NODE_ENV to production
:
plugins: [
new webpack.DefinePlugin({
'process.env.NODE_ENV': '"production"',
})
]
For Windows Powershell use this command
$env:NODE_ENV="production" ; node app.js
No one mentioned .env
in here yet? Make a .env
file in your app root, then require('dotenv').config()
and read the values. Easily changed, easily read, cross platform.
Source: Stackoverflow.com