memory-leak.js

const heapdump = require('heapdump')
const app = require('koa')()
const router = require('koa-router')()

const log = [];

router.get('/', function *(next) {
  log.push(this.headers)
  this.body = {
    status: 'finding a leak'
  }
})

app
  .use(router.routes())
  .use(router.allowedMethods())

app.listen(process.env.PORT || 3000)

could you explain how declaring log as global variable causing memory leak?

could you explain how declaring log as global variable causing memory leak?

log being global means it never goes out of scope, never gets garbage collected. but with each http request it's growing in size. hence, memory leak.