Tiny module to generate request validation middleware for Koa using Joi.

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2630.5.16 years ago6 years agoMinified + gzip package size for koa-joi-validate in KB


A tiny module to provide Joi validation middleware within a Koa server.
Calling the module allows you to easily generate Koa middleware to validate incoming requests using Joi.


npm install koa-joi-validate


const validate = require('koa-joi-validate')

import validate from 'koa-joi-validate'


To use the module, call validate with an object containing Joi validation objects for the request headers, URL query, URL path params, and post body.
The following basic example will verify that any request to the server contains a properly formatted request ID header and user ID url query parameter.
const Koa = require('koa')
const joi = require('joi')
const validate = require('koa-joi-validate')

const app = new Koa()

  headers: {
    // Request headers Joi validation object
    "x-request-id": joi.string().alphanum().length(32)
  query: {
    // URL query string Joi validation object
    userid: joi.string().required()
  params: {
    // URL path parameters Joi validation object
  body: {
    // POST body Joi validation object

app.use(async ctx => {
  ctx.body = 'Hello World';


Here is another basic example, mounting a validator on a specific route using koa-router.
const router = new Router()

const loginValidator = validate({
  body: {
    username: Joi.string().required(),
    password: Joi.string().required()

router.post('/login', loginValidator, async ctx => {
  const { username, password } = ctx.body
  const response = await login(username, password)
  ctx.body = response

For more examples of the (very powerful) validation capabilities of Joi, view the official documentation - https://github.com/hapijs/joi
If the validation fails, an HTTP 400 response will be returned to the client, along with a short human-readable error message explaining why the request was rejected.