How can I pass paramters in a middleware call to the middleware? - express

Question

So I am trying to pass a parameter in my middleware call in my router and then catch that data in the middleware.
I keep getting the following error: Error: Route.post() requires a callback function but got a [object Promise]
// admin router
const express = require('express')
const Admin = require('../models/users/admin')
const auth_admin = require('../middleware/auth_admin')
const router = new express.Router()
const mongoose = require('mongoose')
router.post('/', auth_admin('text'), async (req, res) => {
// code placeholder
})
module.exports = router
// middleware
const jwt = require('jsonwebtoken')
const Admin = require('../models/users/admin')
module.exports = function auth_admin(data) {
return function async (req, res, next) {
console.log(data)
try {
const token = req.header('Authorization').replace('Bearer ', '')
const decoded = jwt.verify(token, 'f33~#%d6gf63geswg###F3f')
const admin = await Admin.findOne({ _id: decoded._id, 'tokens.token': token })
if (!admin) {
throw new Error()
}
req.token = token
req.admin = admin
next()
} catch(err) {
res.status(401).send({error: 'Authentication failed.'})
}
}
}

Answer 1

instead for passing additional parameter add property to req object, and then access this property in the middleware function.
eg:
// admin router
const express = require('express')
const Admin = require('../models/users/admin')
const auth_admin = require('../middleware/auth_admin')
const router = new express.Router()
const mongoose = require('mongoose')
router.post('/', async function async(req, res, next) {
req.middlewareData = 'text';
next()
}, auth_admin, async (req, res) => {
// code placeholder
})
module.exports = router
// middleware auth_admin
const jwt = require('jsonwebtoken')
const Admin = require('../models/users/admin')
exports.auth_admin = function async(req, res, next) {
console.log(req.middlewareData)
try {
const token = req.header('Authorization').replace('Bearer ', '')
const decoded = jwt.verify(token, 'f33~#%d6gf63geswg###F3f')
const admin = await Admin.findOne({ _id: decoded._id, 'tokens.token': token })
if (!admin) {
throw new Error()
}
req.token = token
req.admin = admin
next()
} catch (err) {
res.status(401).send({ error: 'Authentication failed.' })
}
}