Bun vs Node.js vs Deno -- UK JavaScript Runtime (2026)
Node.js 20 LTS is ClickMasters default for all UK regulated production workloads: largest ecosystem (npm -- every NHS, FCA, and GDS library available), longest-term LTS support (critical for NHS DTAC evidence continuity), and the most proven regulated-sector production track record. Bun is ClickMasters default for development speed (Bun dev server and test runner in development -- faster feedback loops). Deno is right for secure-by-default scripts and edge workloads. Runtime choice affects NHS DTAC Domain 3 security patch availability, FCA PS21/3 LTS support continuity, and UK developer talent market availability.
| Factor | Node.js 20 LTS | Bun 1.x | Deno 2.x |
|---|---|---|---|
| NHS DTAC LTS support (3+ years) | BEST -- Node.js 20 LTS until April 2026, Node.js 22 LTS from Oct 2024 | No formal LTS -- Bun updates frequently | Deno LTS in progress -- less mature LTS model |
| FCA PS21/3 security patches | BEST -- Node.js CVE patches within 7 days (Dependabot) | Bun patches frequent -- less formal CVE tracking | Deno security patches -- improving |
| npm ecosystem compatibility | BEST -- every NHS/FCA/GDS npm package works | 95% npm compat -- some native modules fail | npm compatibility improving but gaps remain |
| Development speed (tests, bundling) | Good -- Jest + esbuild | BEST -- Bun test runner 10x faster than Jest, native bundler | Good -- Deno built-in test runner |
| UK developer talent pool | BEST -- Node.js universally known | Growing -- Bun gaining traction | Small -- Deno niche |
| TypeScript native | Via ts-node or tsx (< 1 second compile) | BEST -- TypeScript native, zero config | BEST -- TypeScript native, zero config |
| AWS Lambda support | BEST -- Node.js 20 Lambda runtime (AWS managed) | Bun on Lambda (custom runtime -- not AWS managed) | Deno on Lambda (custom runtime -- not AWS managed) |
| ECS Fargate (Docker) | BEST -- official Node.js Docker images, well-tested | Official Bun Docker image -- good | Official Deno Docker image -- good |
| ClickMasters default | All UK regulated production (NHS, FCA, GDS) | Development speed (dev server, test runner, scripts) | Secure scripts, edge workloads, Deno Deploy |
Book a Free Consultation Honest advice. -> clickmasterssoftwaredevelopmentcompany.co.uk/contact/
More Technology Comparisons
Fixed Price vs Time & Materials Software Contracts UK — Honest Comparison (2025)
For most UK custom software projects with defined requirements: fixed price is better for the client
Fixed Price vs Time and Materials — Which Software Contract for UK Buyers?
Fixed-price Agile is the right contract model for most UK software projects: cost certainty, scope c
Next.js vs Remix vs Astro — UK React Framework (2026)
Next.js App Router is the UK default for full-stack React applications — largest UK ecosystem, best
Vercel vs Netlify vs AWS CloudFront (OpenNext) — UK Frontend Hosting (2026)
AWS CloudFront via OpenNext is the right choice for NHS, FCA, and GDS regulated UK applications — UK
Get Unbiased Technology Advice
Our architects are certified across all major platforms. We recommend what's actually right for your business — no commission, no bias.
Book Free Consultation