Koa2 cannot receive the formdata data submitted by the post method (value: {})

terms of settlement

1. The first thing to use must be koa-body This middleware ;
2. secondly , Just configure the parameters ;

const Koa = require('koa')
const app = new Koa()
const bodyparser = require('koa-body')

app.use(bodyparser({
    
  enableTypes: ['json', 'form', 'text'],
  multipart: true // *****  This is this.  ( Do you support  multipart-formdate  Form for )
}))

3. Last It can be used in routing

router.post('/register', function (ctx, next) {
    
  console.log(ctx.request.body); //  Here you can get the parameters from the front end 
  ctx.response.body = "";
})

Small warning ( Be careful )

const bodyparser = require('koa-body')({
     //  If you configure parameters here once 
 	multipart: true
})

app.use(bodyparser({
     //  Here is another configuration ,name This configuration will overwrite the above , That is to say, the above configuration does not take effect 
  enableTypes: ['json', 'form', 'text'],
}))
//  At the beginning, I suffered this loss , go to a lot of trouble for nothing 

Attach the configuration instruction document

NPM documentation
Chinese translation published by a blogger ： Parameters