Compress middleware for Koa

Install v1.x for Koa v1. Install v2.x or next for Koa v2.

var compress = require('koa-compress')
var koa = require('koa')

var app = koa()
app.use(compress({
  filter: function (content_type) {
  	return /text/i.test(content_type)
  },
  threshold: 2048,
  flush: require('zlib').Z_SYNC_FLUSH
}))

The options are passed to zlib: http://nodejs.org/api/zlib.html#zlib_options

An optional function that checks the response content type to decide whether to compress. By default, it uses compressible.

Minimum response size in bytes to compress. Default 1024 bytes or 1kb.

You can always enable compression by setting this.compress = true. You can always disable compression by setting this.compress = false. This bypasses the filter check.

app.use(function (next) {
  return function *() {
    this.compress = true
    this.body = fs.createReadStream(file)
  }
})