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middleware

Middleware​

Psychic has a concept of middleware which piggy-backs off of Koa, enabling you compose in the routing layer as though you were in a Koa app:

// conf/routes.ts
...
  r.post('/sign-in', async (ctx, next) => {
    ctx.body = { hello: 'world' }
  })

This approach bypasses the controller layer, which we don't recommend since it provides such helpful utilities, but can be useful sometimes, say, when integrating with Koa middleware.

Multiple middleware callbacks​

In addition to a single middleware callback, Psychic enables you to provide several, ordered middleware callbacks. To do this, simply put the callbacks into an array, like so:

  r.post('/sign-in', [
    async (ctx, next) => {
      console.log('A')
      await next()
    },
    async (ctx, next) => {
      console.log('B')
      await next()
    },
    async (ctx, next) => {
      console.log('C')
      ctx.body = { nowIKnowMy: ['a', 'b', 'c']}
    },
  )