https://yogeshchauhan.dev/blog Notes on web development — React, Node.js, AI, and distributed systems. en https://yogeshchauhan.dev/blog/how-jwt-auth-works https://yogeshchauhan.dev/blog/how-jwt-auth-works What a JWT really is, why access and refresh tokens exist, and the security decisions that separate a toy auth system from a production one. Fri, 10 Jul 2026 00:00:00 GMT https://yogeshchauhan.dev/blog/understanding-rag https://yogeshchauhan.dev/blog/understanding-rag How to give an LLM access to your own data — the anatomy of a RAG pipeline, from chunking and embeddings to retrieval and grounded generation. Sun, 05 Jul 2026 00:00:00 GMT https://yogeshchauhan.dev/blog/s3-presigned-uploads https://yogeshchauhan.dev/blog/s3-presigned-uploads Why you should never proxy file uploads through your server — and how S3 pre-signed URLs let clients upload directly, securely, and at scale. Sat, 20 Jun 2026 00:00:00 GMT https://yogeshchauhan.dev/blog/scaling-node-backend https://yogeshchauhan.dev/blog/scaling-node-backend The distributed-systems fundamentals that turn a slow API fast — caching, the N+1 trap, database indexing, background jobs, and idempotency. Tue, 02 Jun 2026 00:00:00 GMT https://yogeshchauhan.dev/blog/realtime-with-sse https://yogeshchauhan.dev/blog/realtime-with-sse You don't always need WebSockets. How Server-Sent Events give you live, one-way updates over plain HTTP — and when to reach for them. Mon, 18 May 2026 00:00:00 GMT