Response Time Middleware

responseTime() measures the time from when the request enters the middleware to when the response is committed, then writes the duration into a response header.

Coming from Express?

Same behaviour as the response-time npm package. Same options, same header.

Basic usage

import { responseTime } from "bunway";

app.use(responseTime());
// X-Response-Time: 1.234ms

Mount it as early as possible so the timer starts before any other middleware runs.

Custom header

app.use(responseTime({ header: "X-Duration" }));

Controlling format

// No "ms" suffix — useful when you want a raw number
app.use(responseTime({ suffix: false }));
// X-Response-Time: 1.234

// Fewer decimal places
app.use(responseTime({ digits: 0 }));
// X-Response-Time: 1ms

Options reference

Option	Type	Default	Description
header	string	"X-Response-Time"	Response header name.
digits	number	3	Decimal places in the reported value.
suffix	boolean	true	Append ms to the value.

For type details see ResponseTimeOptions in the API Reference.