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Recent posts in JavaScript on DZone.com

Builder Pattern + Faker in API Test Automation Using Playwright With TypeScript

Ever felt stuck writing Playwright tests because of messy or hardcoded test data? It usually starts simple, but as your tests grow, like testing an...
Posted on 13 October 2026 | 5:00 pm

How to Verify Response Data in API Testing With Playwright TypeScript

One of the most important parts of API test automation is validating the response body to ensure data integrity. This step plays a key role in func...
Posted on 25 September 2026 | 1:00 pm

When TypeScript Types Meet Untrusted AI: Building Type-Safe LLM Pipelines With Runtime Validation

TypeScript can make an LLM integration look safer than it is. A function may promise Promise<Classification> and every branch may compile und...
Posted on 11 September 2026 | 6:00 pm

Replacing JSON With Protobuf in Your Microservice Mesh: A Zero-Downtime Migration Blueprint

When engineering teams build distributed systems, they naturally reach for REST over HTTP/1.1 with JSON payloads. JSON is readable, universally s...
Posted on 11 September 2026 | 2:00 pm

Angular Apps Don’t Need Another Chatbot: Building Agentic UI Workflows With TypeScript

A chatbot can explain data, summarize a screen, or answer questions, yet the application still behaves largely as before: business state lives else...
Posted on 10 September 2026 | 5:00 pm

How to Test GET API Requests With Playwright TypeScript

Playwright is a widely used open-source test automation framework developed by Microsoft. It allows developers and test automation engineers to rel...
Posted on 10 September 2026 | 3:00 pm

Fetching Information Randomly From JSON Using Node, Nuxt, Express

Nuxt.js is a popular framework for Vue.js, and it is widely used for websites that require server-side rendering. It is similar to the Next.js fram...
Posted on 10 September 2026 | 12:00 pm

Node.js Microservices Architecture: A Complete Guide

Most teams don't decide to build microservices. They get pushed into it. One app grows for a couple of years. More people push into the same codeba...
Posted on 2 September 2026 | 3:00 pm

The Code-Volume Delusion: Rethinking Engineering Velocity in the AI Era

Let's be honest about what happens when you give an entire engineering team AI coding assistants. You look at the sprint board, and tickets are mov...
Posted on 25 August 2026 | 3:00 pm

Text Analysis Without a Backend: Replacing an LLM Call With Intl.Segmenter and 60 Lines of JavaScript

Last spring, I had six small text features to build: flag filler phrases in a draft, score sentence-length variation, format a citation, check a ...
Posted on 24 August 2026 | 6:00 pm

Stop Hand-Rolling Chat UIs: Streaming LLM Tokens Into React Native Without the Jank

A chat screen looks like a weekend project: a list of bubbles and a text input pinned to the bottom. In React Native, it is one of the hardest thin...
Posted on 20 August 2026 | 6:00 pm

A Framework-Agnostic Approach to SSR for Microfrontends

On one of our projects, we were building microfrontends, and at some point we wanted to add SSR. The reasons were the usual ones: better first pain...
Posted on 11 August 2026 | 1:00 pm

How We Cut PyFlink Pipeline p99 Latency from 3-5 Seconds to ~500ms

The Problem: Our p99 Was 3-5 Seconds Our PyFlink pipeline was missing its latency SLO by seconds. The pipeline itself was straightforward: consume ...
Posted on 7 August 2026 | 4:00 pm

Refresh Token Rotation in Node.js: Stopping Token Theft Without Logging Users Out

JWT-based authentication is simple to start with and surprisingly hard to get right. The naive setup of a long-lived access token stored in the bro...
Posted on 22 July 2026 | 5:00 pm

React 19 Killed Half My Performance Optimization Code, and I'm Grateful

I maintain a React admin dashboard codebase that had — at last count before upgrading to React 19 — 34 instances of useMemo, 28 instances of useCal...
Posted on 22 July 2026 | 4:00 pm

Add Observability to Your React Native Application in 5 Minutes

In modern application development, feature flags are the guardrails that keep experiments controlled and rollbacks safe when conditions shift. If f...
Posted on 6 July 2026 | 3:00 pm

Dead Letter Queue Patterns in Apache Flink: Handling Poison Messages Without Stopping Your Stream

Streaming systems usually fail in one of two ways: Loudly, when infrastructure breaks Quietly, when one bad record keeps replaying until th...
Posted on 2 July 2026 | 1:00 pm

AI-Augmented React Development: How I Rebuilt My Workflow Without Losing Control of the Code

Every React developer reaches a point where the sheer volume of boilerplate starts to slow them down. Prop drilling, repetitive hook patterns, comp...
Posted on 1 July 2026 | 2:00 pm

Fix the Target, Precompute Once: A Backend-Free Word-Ladder Solver With a BFS Distance Field

When you build an interactive puzzle, the latency budget is unforgiving. Every keystroke needs an answer that feels instant. A daily word-ladder ga...
Posted on 22 June 2026 | 1:00 pm

The Real-Time Revolution: Why Blockchain Needs Data Stream Processing

Blockchain is an extremely data-driven technology because its primary function is to store, verify, and coordinate independent records in a secure,...
Posted on 17 June 2026 | 6:00 pm