Mayank Poojary

21 Days Challenge – Day 21 Explored indexing concepts through documentation. Also solved a few aptitude questions and revised some frontend concepts to prepare for building the project UI. #21DaysOfCode #Backend #Frontend

21 Days Challenge – Day 20 Built routes, models and controllers for user follow and post like features. Stored these relationships using edge collections to manage connections between users and posts. Also solved a few basic DSA problems. #21DaysOfCode #Backend #DSA

21 Days Challenge – Day 19 Learned about middleware functions that run before route handlers to manage common logic like auth and validation, reducing repeated code. Explored MongoDB collections and edge collections to represent relationships between data. #21DaysOfCode #Backend

21 Days Challenge – Day 18 Built getPosts and getPostDetails routes for the Instagram clone with JWT auth using cookies. Verified users, fetched their posts, and handled 401, 403, 404 responses with proper authorization checks. #21DaysOfCode #Backend

21 Days Challenge – Day 17 Learned basic Java concepts like loops, switch case, and if-else and applied them by solving problems, focusing on logic building. Also explored ImageKit docs and checked out Multer on npm for file upload handling. #21DaysOfCode #Java #Backend

21 Days Challenge – Day 16 In the Instagram clone, implemented image uploads using ImageKit. Learned how to send images from client to server using multer (memory storage), upload to ImageKit, and store the image URL with the user ID in the database. #21DaysOfCode #Backend

21 Days Challenge – Day 15 Started working on an Instagram clone backend. Completed the login and register endpoints and connected them to the database. Also started learning Java and covered some basic concepts. #21DaysOfCode #Backend #DSA

21 Days Challenge – Day 14 Learned about crypto and bcrypt for password security. Passwords are hashed before storing in the database, and during authentication bcrypt's compare method is used to verify the user’s password against the stored hash. #21DaysOfCode #Backend

21 Days Challenge – Day 13 Learned about JWT and cookie-parser. Built a register route that checks existing users, creates a user, generates a token, and stores it in cookies. Also learned servers can read/write cookies but not other browser storages. #21DaysOfCode #Backend

21 Days Challenge - Day 12 Connected the React frontend with the backend API and implemented CRUD operations for notes. Used CORS to allow communication between them. Earlier tested APIs with Postman, now all interactions happen through the React UI using Axios. #21DaysOfCode

21 Days Challenge - Day 11 Learned how the React Context API shares state across components using context and a Provider. Also practiced more percentage aptitude problems. #21DaysOfCode #Frontend #SheryiansCodingSchool

21 Days Challenge - Day 10 Solved array problems : Left Rotation by 1 , Right Rotation by 1 and Left Rotation by K. Also practiced Percentage based Aptitude questions. Didn’t get much time today due to college assignments. #21DaysOfCode #DSA #SheryiansCodingSchool #Aptitude

21 Days Challenge - Day 9 Solved array problems like Find Maximum Element, Second Maximum Element and Move Zeros using basic array traversal. Also started practicing Aptitude, since it’s equally important for improving logical thinking and problem solving. #21DaysOfCode #DSA

21 Days Challenge - Day 8 Learned how React Router DOM handles client-side routing and navigation in React without page reloads. Also started Arrays in DSA and practiced some basic problems, but mostly spent time making notes today. #21DaysOfCode #Frontend #SheryiansCodingSchool

21 Days Challenge - Day 7 Connected the backend to the database and implemented CRUD operations using MongoDB and Mongoose. Getting a better understanding of how backend and database interactions work. #21DaysOfCode #Backend #SheryiansCodingSchool

21 Days Challenge - Day 6 Practiced a DSA problem on Armstrong Number and went through the backend concepts I learned earlier to strengthen my foundation before continuing further. Finished my exams today so time to focus more on Backend and DSA. #21DaysOfCode #DSA #Backend

21 Days Challenge - Day 5 Practiced two DSA problems today : Harshad Number and Abundant Number checkers. Didn’t get much time because of exams, but stayed consistent with the challenge. #21DaysOfCode #DSA #SheryiansCodingSchool

21 Days Challenge - Day 4 Practiced basic DSA problems using loops. Solved Sum of Digits, Prime check and Automorphic Number problems. Strengthening problem solving fundamentals step by step. #21DaysOfCode #DSA #SheryiansCodingSchool

21 Days Challenge - Day 3 Implemented a Note model using Mongoose (schema → model → collection). Used dotenv for secure environment configuration. Structured backend with models (schemas) and config (DB connection) folders. #21DaysOfCode #Backend #SheryiansCodingSchool

21 Days Challenge - Day 2 Structured my Express server with GET, POST, PATCH & DELETE routes while learning REST fundamentals and using proper status codes (200, 201, 204) for clean JSON responses. #21DaysOfCode #Backend #NodeJS #ExpressJS #SheryiansCodingSchool