What is express js and why it is used? Express.js is a modular web framework for Node.js. It is used for easier creation of web applications and services . Express.js simplifies development and makes it easier to write secure, modular and fast applications. JWT Token - Node Js https://github.com/auth0/node-jsonwebtoken Issue resolve of request.body parameter value using openapi: '3.0.1' , https://stackoverflow.com/questions/58634566/swagger-openapi-3-0-x-empty-body Refrenece: https://medium.com/javascript-in-plain-english/typescript-with-node-and-express-js-why-when-and-how-eb6bc73edd5d Node js with Types Script . npm init -- to create package.json 2. npm install typescript -s include in package.json "scripts": { "tsc": "tsc" }, 3. npm run tsc -- --init -- to create tsconfig.json 4. npm install express -s 5. npm install @types/express -s 6. Create app/app.ts 7. npm run t...