What This Is
JavaScript powers every frontend we build and extends into browser extensions, build tooling, and Node.js services where server-side JavaScript is the right fit. Modern JavaScript — ES2022+ with modules, async/await, optional chaining, and destructuring — is a capable, well-tooled language when used with discipline.
We write JavaScript daily across our React applications, browser extension (Beacon Lens), build processes, and utility scripts. Our primary SaaS platform’s entire frontend is a React SPA written in JavaScript, handling routing, state management, real-time updates via Pusher, and Stripe payment integration — all in the browser. The Beacon Lens extension is also JavaScript, running as a Chrome/Firefox extension with its own execution context and API communication layer.
JavaScript’s ubiquity is its strength. It runs in every browser, powers React and the modern component ecosystem, and extends to the server via Node.js. We use it where it belongs — the browser and browser-adjacent environments — and pair it with PHP/Laravel on the server where a full application framework is more appropriate.
When You Need This
JavaScript is the right choice for browser-based interfaces, React applications, browser extensions, and client-side logic. Common scenarios:
- You are building a single-page application or interactive frontend with React
- Your project needs a browser extension for Chrome, Firefox, or Edge
- You need client-side interactivity — form validation, dynamic UI, real-time updates, or data visualisation in the browser
- Build tooling and automation scripts that run in Node.js as part of your development workflow
- Your application requires WebSocket or real-time communication in the browser
How We Work
Our JavaScript follows modern standards with tooling enforcement. We write ES2022+ with module syntax, use ESLint for linting, and Prettier for formatting. Dependencies are managed through npm with lockfiles committed for reproducible builds. Vite handles bundling and development server for fast iteration.
Component architecture follows React patterns — functional components with hooks, context for shared state, and clear separation between UI components and data-fetching logic. Where TypeScript is appropriate, we use it (see our TypeScript page), but JavaScript remains our default for projects where the team and codebase do not benefit from the additional type system overhead.
Testing uses Jest or Vitest for unit tests and React Testing Library for component tests. We test behaviour (what the user sees and does), not implementation details (internal state changes). End-to-end testing with Playwright covers critical user flows.
What You Get
- React applications — single-page applications with routing, state management, and API integration
- Browser extensions — Chrome and Firefox extensions with popup interfaces, content scripts, and background workers
- Interactive UI components — data tables, form builders, dashboards, and real-time updating interfaces
- Build pipeline — Vite-based build with hot module replacement, code splitting, and production optimisation
- Client-side integrations — Stripe Elements, Pusher real-time, and third-party widget embedding
- Tested code — unit tests, component tests, and end-to-end coverage for critical paths
Technologies We Use
- ES2022+ JavaScript — modern syntax with modules, async/await, and current language features
- React 18 — component-based UI development with hooks, context, and concurrent features
- Vite — build tooling with fast development server and optimised production builds
- ESLint + Prettier — consistent code style and error prevention
- npm — dependency management with lockfile-based reproducibility
Related Systems
JavaScript frontends consume APIs built with Laravel and PHP. Data is stored in PostgreSQL and served through JSON APIs. For projects requiring static type safety, we use TypeScript instead.
Talk to Us About JavaScript Development
If you need a React application, browser extension, or interactive frontend built with modern JavaScript, get in touch and we will scope the project.
