Express middleware that sends Server-Timing stats for routes
npm install express-simple-timing> Express middleware that sets Server Timing API headers and optionally sends timers to stats systems.
express-simple-timing returns a middleware function that can be used with an express server. It sends Server-Timing headers to the client to allow inspection of route timings. It can also send stats to your stats system by using a callback passed into the constructor.
A default key of total is created based on the total time to deliver the entire route.
``
npm install --save express-simple-timing
``js
const simpleTiming = require('express-simple-timing');
const router = require('express').Router();
router.use(simpleTiming());
module.exports = router.put('/mypath', function(req, res) {
res.json({
message: 'my response'
});
});
``
This will add a total value by default, such as:
`
server-timing: total;dur=4.043
By using the serverTimingStart and serverTimingEnd methods you can send ad hoc metrics for your app:
`
res.serverTimingStart('woof');
barkLikeADog();
res.serverTimingEnd('woof');
This will then add an additional timing header:
`
server-timing: woof;dur=2.43
To use the timing metrics in your own stats system, you can pass a callback which receives req, key and value every time a server-timing header is added.
``js
const myStats = require('my-stats-system');
const simpleTiming = require('express-simple-timing');
const router = require('express').Router();
function myStatsHook(req, key, value) {
myStats(req.url, key, value);
}
router.use(simpleTiming(myStatsHook));
``
`
npm test