Our environment:

• Express Server
• TypeScript
• Joi validation
• Swagger

Our task: DRY

For this task we should create Swagger documentation and TypeScript Interfaces just from Joi-Schemas!

Ready? Go!

Step 1: Installing Dependencies

npm init
npm install --save express http body-parser swagger-ui-express joi joi-to-swagger @babel/core @types/node typescript ts-node
npm install --save-dev gulp @babel/register @babel/plugin-proposal-class-properties @babel/preset-env @babel/preset-typescript json-schema-to-typescript

You may need to install ts-node globally if local version will not run:

npm install -g ts-node

The first group of tools allows us to make a swag, the second will create TypeScript interfaces for us.

Step 2: Creating the Express Server

First things first: we need to serve routers. For our example we will…