Validate route parameters in middleware of express using Joi

example.js

// file: lib/middleware-joi-validator/index.js

const Joi = require('@hapi/joi');

const validate = (schema, options) => {
  options = options || {}

  const validateRequest = (req, res, next) => {
    const toValidate = {}
    if (!schema) {
      return next()
    }

    ['params', 'body', 'query'].forEach(key => {
      if (schema[key]) {
        toValidate[key] = req[key]
      }
    })

    const onValidationComplete = (err) => {
      if (err) {
        return res.status(400).json(err.details)
      }

      return next()
    }

    return Joi.validate(toValidate, schema, options, onValidationComplete)
  }

  return validateRequest
}

module.exports = validate

// ---------------------------------------------------------------------------

// file: src/routes/lorem-ipsum/getLorem.js

const validator = require('../../lib/middleware-joi-validator')
const Joi = require('joi')

var schema = {
  query: {
    limit: Joi.number().default(10).min(10).max(100),
    offset: Joi.number().default(10).min(10).max(100)
  },
  body: {
    name: Joi.string().required()
  }
}

const middleware = validator(schema)

const getLorem = async (req, res) => {
 // End-point
}

module.exports = [ middleware, getLorem ]

// ---------------------------------------------------------------------------