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middleware

Middleware​

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

// conf/routes.ts
...
  r.post('/sign-in', (req, res) => {
    res.json({ hello: 'world' })
  })

This approach bypasses our controller layer, which we don't recommend since it provides such helpful utilities, but can be useful sometimes, say, when integrating with express 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', [
    (req, res, next) => {
      console.log('A')
      next()
    },
    (req, res, next) => {
      console.log('B')
      next()
    },
    (req, res, next) => {
      console.log('C')
      res.json({ nowIKnowMy: ['a', 'b', 'c']})
    },
  )