a body parser for koa. support json, form(urlencoded), multipart and text type body.

const Koa = require('koa')
const parser = require('koa-parser')

const port = 3000
const app = new Koa()

app.use(parser())

app.use(async (ctx, next) => {
  // if nothing was parsed, body will be undefined
  if (ctx.request.body !== undefined) {
    ctx.body = ctx.request.body
  }
  await next()
})

app.listen(port)
console.error(`listening on port ${port}`)

app.use(parser({
  encoding?: string, // requested encoding
  error?: (err: any, ctx: Koa.Context) => any, // support custom parser error handle
  json?: string | string[], // support json parser types
  multipart?: string | string[], // support multipart(form-data) parser types
  text?: string | string[], // support text parser types
  urlencoded?: string | string[] // support urlencoded(form) parser types
}))

• encoding: requested encoding. Default is utf-8

• error: support custom error handle, Default is false. if koa-bodyparser throw an error, you can customize the response like:

  app.use(parser({
    error (err, ctx) {
      console.log(err)
      ctx.throw(err, 422)
    }
  }))

• json: Extended support for json parsing options, The default supported types are ['application/json', 'application/json-patch json', 'application/vnd.api json', 'application/csp-report']. you can customize the type like:

  // json will be support default types and application/x-javascript
  app.use(parser({
    json: 'application/x-javascript' // You can also pass parameters in an array
  }))

• multipart: Extended support for multipart(form-data) parsing options, The default supported types are ['multipart/form-data']

• text: Extended support for text parsing options, The default supported types are ['text/plain']

• urlencoded: Extended support for urlencoded(form) parsing options, The default supported types are ['application/x-www-form-urlencoded']

MIT