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March 29, 2018 13:47
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Middleware to measure request duration for express using the Performance Timing API.
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const { performance } = require('perf_hooks'); | |
const express = require('express'); | |
const expressRequestDurationMiddleware = (req, res, next) => { | |
performance.mark('request.start'); | |
const end = res.end; | |
res.end = (...args) => { | |
performance.mark('request.end'); | |
performance.measure('request', 'request.start', 'request.end'); | |
const measure = performance.getEntriesByName('request')[0]; | |
console.log(`Duration: ${measure.duration}ms\n`); | |
performance.clearMeasures('request'); | |
performance.clearMarks('request.start'); | |
performance.clearMarks('request.end'); | |
end.apply(res, args); | |
}; | |
next(); | |
} | |
// example usage: | |
const app = express(); | |
app.use(expressRequestDurationMiddleware); |
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