𝐃𝐚𝐲 𝟏𝟔 | @𝐑𝐞𝐪𝐮𝐞𝐬𝐭𝐁𝐨𝐝𝐲, 𝐃𝐓𝐎, 𝐍𝐞𝐬𝐭𝐞𝐝 𝐉𝐒𝐎𝐍 & 𝐋𝐨𝐠𝐢𝐧 𝐀𝐏𝐈 | 𝐆𝐫𝐨𝐰 𝐈𝐓 𝐒𝐤𝐢𝐥𝐥𝐬

Welcome to Day 16 of the Java Spring Boot Backend Development Course by Grow IT Skills!** 🚀 In this class, we continue learning how to receive JSON request data in Spring Boot using `@RequestBody` and DTO (Data Transfer Object) classes. Through practical real-world examples, we build email-password login and mobile-OTP login APIs. We also understand how to handle nested JSON objects, create multiple DTO classes, map JSON data to Java variables, and debug common API request errors using Postman. 📚 𝐓𝐨𝐩𝐢𝐜𝐬 𝐂𝐨𝐯𝐞𝐫𝐞𝐝 ✅ Quick Revision of `@RequestBody` ✅ Understanding DTO (Data Transfer Object) Classes ✅ Creating Login Controller in Spring Boot ✅ Creating Email and Password Login API ✅ Creating Mobile Number and OTP Login API ✅ Understanding `@PostMapping` ✅ Receiving JSON Data Using `@RequestBody` ✅ Creating Separate DTO Classes for Different Requests ✅ Mapping JSON Fields to Java Class Variables ✅ Understanding Variable Naming and JSON Key Matching ✅ Generating Getters, Setters, and `toString()` ✅ Understanding Single JSON Object Structure ✅ Difference Between Parallel and Nested JSON Objects ✅ Understanding Nested JSON Objects ✅ Creating Nested DTO Classes ✅ Handling Multiple Objects Inside a Parent JSON Object ✅ Reusing Existing DTO Classes ✅ Testing Login APIs Using Postman ✅ Debugging Bad Request (400) Errors ✅ Understanding Common JSON Formatting Mistakes ✅ Java Code Comments and `Ctrl + /` Shortcut ✅ Practical API Testing and Troubleshooting 💻 𝐇𝐚𝐧𝐝𝐬-𝐎𝐧 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐞 In this session, we create practical login APIs using Spring Boot: 🔹 Email Login – Email and Password 🔹 Mobile Login – Mobile Number and OTP 🔹 Create DTO classes to receive request data 🔹 Handle nested JSON objects using separate DTO classes 🔹 Test API requests and responses using Postman 🔹 Identify and resolve Bad Request errors 🎯 𝐖𝐡𝐨 𝐒𝐡𝐨𝐮𝐥𝐝 𝐖𝐚𝐭𝐜𝐡? • Beginners learning Java Backend Development • Students learning Spring Boot and REST API Development • Java developers practicing DTO and JSON handling • Students preparing for Java Backend Developer interviews 📌 𝐀𝐛𝐨𝐮𝐭 𝐆𝐫𝐨𝐰 𝐈𝐓 𝐒𝐤𝐢𝐥𝐥𝐬 *GROW IT SKILLS – BY IT PROFESSIONALS* Learn Java, Spring Boot, REST APIs, Backend Development, and industry-relevant programming skills through practical sessions. 📞 Contact: 9582130230 👍 Like this video, share it with your friends, and subscribe to *Grow IT Skills* for more Java and Spring Boot tutorials! #Java #SpringBoot #RequestBody #DTO #NestedJSON #LoginAPI #RESTAPI #Postman #JavaBackendDevelopment #BackendDevelopment #GrowITSkills