Jaina

Beginner dev sharing daily updates on DSA, Web Dev
#100DaysOfCode

[Jaina @JP100x]

@rohit_negi9 Soo Trueee

[Jaina @JP100x]

🚀Day65 #WebDev
Why NoSQL exists:
Adding new features in SQL means altering massive tables ->slow, memory-heavy, and painful.
NoSQL stores flexible JSON like docs → new fields = easy.
• SQL = normalized + joins + ACID
• NoSQL = denormalized + fast + scalable
@rohit_negi9

[Jaina @JP100x]

🚀Day64
Why express.json exist even though JSON.parse already does the job
Internally express.json uses JSON.parse
key difference is data from client arrive as a stream not as complete object
JSON.parse needs entire JSON at once
express.json reads data in chunks
@rohit_negi9

[Jaina @JP100x]

@Aniketk91470702 @rohit_negi9 sure

[Jaina @JP100x]

🚀Day62 #WebDevelopment
JSON is same as JS Obj?
JS objects are language specific
JSON is a language agnostic string format, so any backend can understand it.
JS Object → JSON.stringify() → string → binary → server
Server → express.json() → JS Object
@rohit_negi9

[Jaina @JP100x]

@yashmp2004 @rohit_negi9 Sure

[Jaina @JP100x]

🚀Day63 #WebDev
• JSON → JS Object: numbers stay numbers (thanks modern parsers)
• URL params = strings → parseInt() needed
• Sensitive data? Always send in body, not URL
• One request → one response (TCP rule)
@rohit_negi9
#Backend #NodeJS #express

[Jaina @JP100x]

Middleware
Middleware sits between request and response:
Centralised logging (debugging, audits, analytics)
Authentication
Eliminates repeated code across routes

Auth concepts
Authentication → Who are you?
Authorisation → What are you allowed to do?

[Jaina @JP100x]

@chiragiscoding @rohit_negi9 Sure

[Jaina @JP100x]

@V1rendra_ @rohit_negi9 Done

[Jaina @JP100x]

@adityash410 @rohit_negi9 Done

[Jaina @JP100x]

@_Creation22 While reading I was like waaaao...couple goals
phir end tak padha 💀😂

[Jaina @JP100x]

@100dys_ @rohit_negi9 😁😊

[Jaina @JP100x]

🚀 Day 61 #WebDevelopment
Frontend talks to backend using CRUD
POST → create
GET → read
PATCH → update specific fields
PUT → update entire resource
DELETE → remove

• Postman = fastest way to test APIs before frontend exists.
@rohit_negi9
#LearningInPublic

[Jaina @JP100x]

@rohit_negi9

[Jaina @JP100x]

🚀Day60 #WebDev
Client Server isn’t magic
Client requests →Server responds
TCP creates socket (IP + Port)
Server responds →connection closed
HTTPS? That’s port 443 telling the client where to talk
No request, yet messages arrive →WebSockets
@rohit_negi9
#LearningInPublic

[Jaina @JP100x]

Day 59 #WebDev
In browsers, Web APIs fill the gap.
In Node.js? libuv does
Libuv (C library) gives:
• timers (setTimeout)
• network calls
• file & DB access
Those “global APIs” are just wrappers.
The real work happens in libuv, which talks directly to the OS.
@rohit_negi9

[Jaina @JP100x]

@ItsHeisenberg04 @rohit_negi9 Done

[Jaina @JP100x]

Just watched video on Neural Networks & Deep Learning
The way weights, bias, loss, and impact based weight updates is explained using simple intuition is 🔥
Huge respect to @rohit_negi9 for teaching fundamentals the right way 🙌🙏

video link : https://t.co/4zvuqLsqgF

[Jaina @JP100x]

Content like this lowers the barrier for newcomers and builds real understanding, not buzzwords
Also bhaiya is going to cover deep learning in GenAI course, it’s genuinely worth checking out.