Koa Joi Validator

A simple validator for koa 2 application, inspired from koa-joi-validator, with Typescript supported

API

A koa middleware which will validate and transform the request

param	type	required	description
options	object	true
options.type	string	Default to json	the coBody parser to call, can be json form or text
options.failure	int	(ctx: Context, err: ValidationError) => any	false
options.options	{}	false	Options passed to Joi validator, such as allowUnknown
options.body	Joi.object	false	A joi schema validated against the request body
options.params	Joi.object	false	A joi schema validated against the request params
options.headers	Joi.object	false	A joi schema validated against the request headers
options.query	Joi.object	false	A joi schema validated against the request query

Requirement

• NodeJS >= 7.6 is required.
• Joi

Installation

Install using npm:

npm install koa2-joi-validator joi

Usage

import { KoaJoiValidator } from "koa2-joi-validator";
import * as Joi from "joi";


router.post('/:number/:string/:date',
  KoaJoiValidator({
    type: 'json',
    params: {
      number: Joi.number().required(),
      string: Joi.string().required(),
      date: Joi.string().isoDate().required()
    },
    body: {
      number: Joi.number().required(),
      string: Joi.string().required(),
      date: Joi.string().isoDate().required()
    },
    headers: Joi.object({
      number: Joi.number().required(),
      string: Joi.string().required(),
      date: Joi.string().isoDate().required()
    }).options({ allowUnknown: true }),
    query: {
      number: Joi.number().required(),
      string: Joi.string().required(),
      date: Joi.string().isoDate().required()
    },
    failure(ctx: Koa.Context, err: Joi.ValidationError) {
      console.log(err);
      ctx.throw(400);
      
    }
  }),
  (ctx: Koa.Context) => {
    expect(typeof ctx.params.number === 'number');
    expect(typeof ctx.params.string === 'string');
    expect(ctx.params.date instanceof Date);

    ['body', 'headers', 'query'].forEach((el) => {
      expect(typeof ctx.request[el].number === 'number');
      expect(typeof ctx.request[el].string === 'string');
      expect(ctx.request[el].date instanceof Date);
    });

    ctx.status = 204;
  },
  
);