middleware-joi

A Joi validation middleware for Marble.js.

Joi is an object schema description language and validator for JavaScript objects. Using its schema language, you can validate things like:

• HTTP request headers

• HTTP body parameters

• HTTP request query parameters

• URL parameters

You can find detailed API reference for Joi schemas here.

For more advanced request or event validation purposes we highly recommend to use @marblejs/middleware-io package instead. It can better handle type inference for complex schemas.

Installation

yarn add @marblejs/middleware-joi

Requires @marblejs/core to be installed.

Importing

import { validator$ } from '@marblejs/middleware-joi';

Type declaration

validator$ :: (Schema, Joi.ValidationOptions) -> HttpMiddlewareEffect

Parameters

parameter	definition
schema	Schema
options	<optional> Joi.ValidationOptions (see: Joi API reference)

Schema

parameter	definition
headers	<optional> any
params	<optional> any
query	<optional> any
body	<optional> any

Usage

1. Example of using middleware on a GET route to validate query parameters:

foo.effect.ts

import { r } from '@marblejs/core';
import { validator$, Joi } from '@marblejs/middleware-joi';

const foo$ = r.pipe(
  r.matchPath('/'),
  r.matchType('GET'),
  r.useEffect(req$ => req$.pipe(
    use(validator$({
      query: Joi.object({
        id: Joi.number().min(1).max(10),
      })
    }));
    // ...
  )));

Example above will validate each incoming request connected with foo$ Effect. The validation blueprint defines that the id query parameter should be a number between <1..10>. If the schema requirements are not satisfied the middleware will throw an error with description what went wrong.

{
  error: {
    status: 400,
    message: '"id" is required'
  }
}

2. Example of validating all incoming requests:

app.ts

import { validator$, Joi } from '@marblejs/middleware-joi';

const middlewares = [
  // ...
  validator$(
    {
      headers: Joi.object({
        token: Joi.string().token().required(),
        accept: Joi.string().default('application/json')
      })
    },
    { stripUnknown: true },
  )
];

const effects = [
  endpoint1$,
  endpoint2$,
  ...
];

const app = httpListener({ middlewares, effects });

Credits

Middleware author: Lucio Rubens