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Snigdha Journal
Dev Diaries is where code meets real learning — covering JavaScript from basics to advanced, along with React, TypeScript, and modern web development. Simple explanations, real examples, and lessons that actually help you build.
Newest published stories in this category first, with room to actually notice them.
Follow one legitimate request through gates, reception, inspection, quotas, and locked floors to understand firewalls, proxies, WAFs, API gateways, DDoS defence, segmentation, and Zero Trust.
2018
Follow one payroll document from storage to delivery and learn data at rest, encryption, hashing, HMAC, signatures, TLS 1.3, certificates, PKI, mTLS, KMS, and envelope encryption.
008
One leaked CI key exposes the full chain: cloud responsibility, IAM, secrets, container supply chain, Kubernetes, serverless, service identity, mTLS, API authorization, OWASP, and useful evidence.
0010
An employee can prove who they are and still be forbidden from issuing a refund. Use that incident to master passwords, MFA, sessions, JWT, OAuth, OIDC, RBAC, ABAC, and least privilege.
2013
A house before a holiday, one private office file, and one upload flow make assets, threats, CIA, STRIDE, threat modelling, and defence in depth finally connect.
2018
At 6:58 PM SnackNow loses an entire cloud region. Build a practical DR plan with RTO, RPO, pilot light, warm standby, multi-region failover, quorum, drills, and safe failback.
209
A mistaken command deletes hundreds of SnackNow orders and replication copies the damage. Learn how backups, PITR, RPO, RTO, retention, immutability, and restore testing recover the business.
108
Keep browsing the latest archive from this category.
One SnackNow server fails at 7:07 PM and takes the business with it. Rebuild the incident with redundancy, N+1 capacity, health checks, failover, graceful degradation, and safe failback.
104
At 7:07 PM SnackNow stays online, yet one successful payment produces the wrong result. That incident reveals what reliability really asks an application to promise.
108
SnackNow's order history collapses during the dinner rush. Aman follows the evidence from slow-query logs and EXPLAIN plans to indexes, N+1 fixes, pooling, pagination, and safer read models.
004
SnackNow receives many orders at once. One cook can juggle them, several cooks can truly work together, and one shared order slip can still ruin the evening.
104
Riya waits while SnackNow sends emails, updates analytics, and calls every service in line. Aman uses an order-slip queue to separate urgent work from work that can finish safely in the background.
204
SnackNow keeps asking its database for the same menu. Aman builds a ready-chai counter to explain cache hits, misses, TTL, invalidation, eviction, and stampede protection.
103
Riya only knows SnackNow feels slow. Aman turns that complaint into latency, throughput, percentiles, SLOs, testing, monitoring, and a bottleneck he can actually fix.
105
SnackNow moves from storing orders to understanding millions of orders, clicks, logs, and events. Learn Big Data, the Vs, data lakes, Delta Lake, batch, stream, and terabytes-per-day pipelines.
204
SnackNow's analytics files outgrow one server disk. Learn file systems, HDFS, NameNode, DataNodes, blocks, replication, rebalancing, latency, throughput, CephFS, and GlusterFS.
105
SnackNow should not put food photos, videos, invoices, and backups directly into database rows. Learn object storage, buckets, keys, metadata, presigned URLs, lifecycle, cost, and security.
004
SnackNow's app servers are fine, but the database is sweating. Learn vertical scaling, read replicas, replication lag, sharding, consistent hashing, and polyglot persistence.
004
SnackNow needs a database, but not every memory fits the same shape. Learn SQL, NoSQL, ACID, BASE, CAP, and database choice through one practical story.
005
SnackNow can take orders, but now it must remember them safely. A beginner-friendly story of storage, data types, durability, availability, consistency, and CAP theorem.
209
SnackNow can route traffic now, but Aman is still guessing server count by hand. Autoscaling teaches the app when to breathe in and breathe out.
205
SnackNow added three servers, but the 7 PM rush still needs one calm traffic director. This story explains load balancing without turning it into jargon.
205
SnackNow is calm at 6:55 PM. Five minutes later, a chai-samosa rush teaches the real meaning of scalability, bottlenecks, and scaling choices.
1013
Riya only wanted chai and samosa. SnackNow had to solve login memory, data packing, and browser security before her order could feel simple.
1045
ChaiCart starts with one phone and one notebook. Then orders grow, layers appear, services split, and events help the system breathe.
3025
A story-based system design guide to TCP, UDP, HTTP, HTTPS, REST, real-time communication, GraphQL, and gRPC using one premium wedding invitation launch.
4025
Maya opens ChaiCart to order masala chai. Behind that simple URL, DNS, IPs, HTTP, proxies, load balancers, API gateways, and CDNs all wake up.
2014
A beginner-friendly story about the moment JavaScript functions turn repeated wedding-planning tasks into reusable code that actually starts doing work.
1123
A beginner-friendly JavaScript objects guide that continues the wedding guest list story and turns one guest into a clear detail card.
2236
A beginner-friendly story guide to JavaScript arrays, told through a wedding guest list that grows from separate names into one clean list.
1211
A warm beginner-friendly story guide to JavaScript loops, explaining for, while, do while, break, continue, nested loops, and infinite loops in simple words.
1218
A story-style beginner guide to JavaScript conditions, showing how if, else, truthy/falsy values, switch, ternary, and UI logic appear in real frontend work.
0043
A beginner-friendly JavaScript operators guide with practical frontend examples for calculations, comparisons, conditions, fallbacks, and UI logic.
1131
A practical beginner-friendly guide to JavaScript data types, with simple examples, frontend use cases, and real-world mistakes developers often debug.
1034
Variables are where JavaScript starts to feel real. Let’s understand var, let, and const in simple words, with practical examples beginners can actually use.
0069
A Day 1 JavaScript story from a mechanical engineer turned software developer: how the language began, why it powers the browser, and what beginners should learn first.
1115