koa-router cannot get path parameters - Stack Overflow

Question

Environment
Node 8.0.0
koa 2.2.0
koa-router 7.1.1

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

router.prefix('/logs/mobile')

router.get('/:platform', function(cxt, next) {
    console.log('params', this.params);
    cxt.body = { error: 'test'}
})

module.exports = router

The code is as shown above, and then access http://127.0.0.1:9901/logs/mobile/ios and successfully obtain the return value of the body,
but this.paramsisundefined

Answer 1

You need to use ctx.params