Setup
npm install node-ab-decider
Use
const decider = require('node-ab-decider')
const choosen = "oldVariant"
const experiments = {
variantA: {
weight: 10,
url: "https://exp-a.example.com/"
},
variantB: {
weight: 20,
url: "https://exp-b.example.com/"
}
}
const x = decider(experiments, choosen)
// possible "x" value: {weight: 10, name:"variantA", url: "https://exp-a.example.com/"}
NOTE: If choosen
is present the experiments object
it doesn't run the choosing algorithm. If it's not present it re-run
the process.
With Express
var app = require('express')();
const {middleware} = require('node-ab-decider')
const experiments = {
variantA: {
weight: 10,
url: "https://exp-a.example.com/"
},
variantB: {
weight: 20,
url: "https://exp-b.example.com/"
}
}
app.use(middleware(experiments, {
// ...opts
}), (req,res)=>res.send('original'))
app.listen(2323,()=>console.log('running on 2323'))
Same logic but, it uses cookies to get the choosen or set the cookie.
Middleware options
maxAge
Expiration (in milliseconds) of the cookie
cookieName
Name of the cookie used to save the choosen exp
skip
Skip this middleware. Useful in dev mode.
hash
Hash added to the cookie. It is something like a version.
sendHeaderToChild
If false it avoids to send "ab-decider-child" header to the proxied endpoint
https
Force https to children
headers
Headers to include in every response