Set the X-UA-Compatible header in an express middleware.
Forces IE to use the most up to date rendering engine possible, default to chrome-frame if installled
npm install ua-compatible --save
var express = require('express')
var app = express()
var uaCompatible = require('ua-compatible')
app.use(uaCompatible)
app.get('/', function (req, res) {
res.get('X-UA-Compatible') // === 'IE=edge,chrome=1'
})
app.listen(3000)