Is there a variable scope in Node.js that persists longer than the request, that is available to all application users? I'd like to create a variable that can be read/written to by multiple app users, like so:
var appScope.appHitCount += 1;
The session scope won't work because it is user specific. Looking for application specific. I couldn't find anything in the Node.js docs. Thanks.
If you have a variable scoped to the app module it will be available and shared by everything within the scope. I imagine in a big app you would need to be careful with this, but it's just regular javascript scoping. For example this will continue to append to the array as you hit it:
const express = require('express')
const app = express()
var input = []
app.get('/:input/', (req, res) => {
var params = req.params
input.push(params.input)
res.send("last input was: " + JSON.stringify(input))
})
app.listen(8080, () => console.log('Example app listening on port 8080!'))
Now visiting 'http://localhost:8080/hi' returns:
last input was: ["hi"]
and then 'http://localhost:8080/there' returns:
last input was: ["hi", "there"]
...etc.
If you want something shared by the entire app (i.e. all the modules) you could set up a module that is require()d by all the modules and i=has the responsibility of getting and setting that value.