--- title: "Bun 1.x vs Node 22 LTS vs Deno 2: SaaS Boilerplate Runtime Choice 2026" description: "Bun 1.x vs Node 22 LTS vs Deno 2 for SaaS boilerplates in 2026: performance, ecosystem, deployment, and boilerplate fit compared." date: "2026-04-26" tier: 2 authors: ["team"] tags: ["bun", "node", "deno", "runtime", "saas-boilerplate", "2026"] --- ## Quick Verdict Three viable JavaScript runtimes for a TypeScript SaaS boilerplate in 2026: - **Node 22 LTS** — the safe default. Largest ecosystem, broadest deployment support, most boilerplate compatibility. The right pick when "ecosystem fit" matters more than benchmarks. - **Bun 1.x** — fastest cold-starts, fastest install, drop-in for most Node code. The right pick for new projects, monorepos, and CLI-heavy boilerplates. - **Deno 2** — secure-by-default, npm-compatible since v2, JSR-native. The right pick when you want clean TypeScript ergonomics and don't need niche Node-only packages. For a brand-new SaaS in 2026: **Bun for the dev loop and CLI, Node for production deploy** is the most common pragmatic answer. **Pure-Bun production** is now realistic for most apps; **Deno production** is realistic if your dependency graph is friendly. ## Key Takeaways - All three run modern TypeScript, ESM, and most npm packages. - **Node 22 LTS** has the longest support window (Active LTS through 2025, Maintenance through 2027) and the broadest hosting story. - **Bun 1.x** has stable APIs and is now the default in many premium boilerplates' `package.json` `packageManager` field. - **Deno 2** unblocked npm compatibility and is finally a credible alternative for production SaaS, not just scripts. ## Decision Table | Scenario | Pick | |----------|------| | Existing boilerplate (ShipFast, Makerkit, T3) | **Node 22 LTS** | | New monorepo greenfield SaaS | **Bun 1.x** | | CLI tool / script-heavy boilerplate | **Bun** or **Deno** | | Edge-deployed app | **Cloudflare Workers** runtime (separate question) | | Strict security posture, permission-based execution | **Deno 2** | | Rails/Java-style "boring is good" pick | **Node 22 LTS** | | Long-running workers + heavy npm deps | **Node 22 LTS** | ## What Has Actually Changed The 2024–2025 stretch closed most of the gaps that previously made non-Node runtimes risky for production: - **Bun 1.x** stabilized: SQLite built-in, native HTTP server, Bun Test, package manager that works on all the popular monorepo layouts. Most npm modules just work. - **Deno 2** ships full npm compatibility — `deno add npm:react` works. The DSL-feel that put people off in 2022 is now optional. - **Node 22** ships native TypeScript stripping (no transpiler needed for most app code), built-in `--watch` mode, native `fetch`, and the `node --run` script runner. The "non-Node is too rough" objection is dated. The remaining tradeoffs are about ecosystem depth, hosting reach, and team familiarity. ## Node 22 LTS **Pricing:** Free. **Fit:** Default for any production SaaS. Universal hosting (Vercel, Railway, Render, Fly, Cloud Run, AWS Lambda, Kubernetes — all first-class). What's new since the 20.x line: - Native TypeScript stripping (`node --experimental-strip-types`). - Built-in `node --watch` for dev-loop reload. - WebSocket client built-in. - Stable test runner (`node:test`), assertion library, and reporters. - Performance: V8 upgrades, faster startup, better stream throughput. Where it bites: - Native TS support strips types but doesn't compile decorators or `enum`s — pair with tsc or swc for those. - Slower install times than Bun (npm/pnpm/yarn all lag bun install). - Worker thread ergonomics still rougher than the others. For most premium boilerplates ([ShipFast, Makerkit, Supastarter](/guides/best-nextjs-saas-boilerplate-2026)), Node 22 is the assumed runtime; everything else is a swap. ## Bun 1.x **Pricing:** Free, MIT. **Fit:** Greenfield monorepo SaaS. Boilerplates with heavy CLI tooling, scripts, or test workloads. Backends built on Hono / Elysia. Anywhere `bun install` (3–10x faster than npm) saves real time. What you get: - All-in-one: runtime, package manager, bundler, test runner, formatter (lite). - Drop-in Node API compatibility for ~95% of common modules. - Built-in SQLite, password hashing, cookies, FormData. - Bun.serve — HTTP/WebSocket server faster than Node's defaults. - Bun Test — Vitest-compatible runner with snapshot, mock, coverage. ```ts // Bun-native HTTP server Bun.serve({ port: 3000, routes: { '/api/health': new Response('ok'), '/api/users/:id': req => Response.json({ id: req.params.id }), }, }); ``` Where it bites: - Some Node-specific packages (older AWS SDK v2, native modules without prebuilds) still trip Bun. - Hosting reach: Vercel, Railway, Render, Fly, Cloud Run support Bun in 2026, but Lambda support is via custom runtime. - Bun's bundler is fast but has rougher edges than esbuild for tricky configs. For Bun-native boilerplates, see [the best Bun + Hono SaaS starter kits](/guides/best-bun-hono-saas-starter-kits-2026) and [Elysia Bun boilerplates](/guides/best-elysiajs-bun-boilerplates-2026). ## Deno 2 **Pricing:** Free, MIT. **Fit:** Boilerplates that lean on web standards (fetch, URL, Headers), security-conscious teams (per-task permissions), and JSR-published packages. Edge functions on Deno Deploy. What you get: - npm compatibility — `deno add npm:next`, `import express from 'npm:express'`. - Permission flags — `deno run --allow-net=api.example.com server.ts` enforces network boundaries. - JSR (JavaScript Registry) — typed, multi-runtime, transparent metadata. - Built-in test runner, formatter, linter, language server. - First-class TypeScript without transpiler. ```ts import { serve } from 'https://deno.land/std/http/server.ts'; serve(req => new Response('hello'), { port: 3000 }); ``` Where it bites: - Some Node-specific packages assume `process.env`, dynamic `require`, or Node `Buffer` semantics in ways Deno's compatibility layer doesn't fully replicate. - Hosting outside Deno Deploy is improving (Docker images everywhere; Lambda via custom runtime) but isn't as ubiquitous as Node. - Smaller boilerplate adoption than Node or Bun. ## Performance Snapshot Rough HTTP request/sec on a typical hello-world server (single-process, no framework): - **Bun**: ~115k req/s - **Deno 2**: ~85k req/s - **Node 22 (built-in fetch + http.createServer)**: ~70k req/s Cold start of a typical SaaS boilerplate (Next.js dev mode): - **Bun**: ~1–1.5 seconds - **Deno 2**: ~2 seconds - **Node 22**: ~2.5–3 seconds Install time on a typical 800-package Next.js + Drizzle + ai-sdk monorepo: - **bun install**: 3–6 seconds - **pnpm install**: 12–20 seconds - **deno install**: 8–15 seconds These numbers vary; the headline is that Bun's dev-loop story is meaningfully faster, while runtime perf differences between the three are small enough that they rarely drive the decision. ## Hosting Compatibility | Host | Node 22 | Bun 1 | Deno 2 | |------|---------|-------|--------| | Vercel | ✅ | ✅ | ✅ via custom | | Railway | ✅ | ✅ | ✅ | | Render | ✅ | ✅ | ✅ | | Fly.io | ✅ | ✅ | ✅ | | Cloud Run | ✅ | ✅ | ✅ | | AWS Lambda | ✅ | Custom runtime | Custom runtime | | Cloudflare Workers | n/a | n/a | n/a (different runtime) | | Deno Deploy | ❌ | ❌ | ✅ | Node still wins on universality. Bun caught up enough that production deploys are routine. Deno is fine but constrained to fewer providers without packaging effort. ## Boilerplate Adoption | Boilerplate | Default runtime | |-------------|-----------------| | ShipFast | Node | | Makerkit | Node (Bun supported) | | Supastarter | Node | | T3 Stack | Node | | Indie Kit | Node (Bun supported) | | Most Hono / Elysia kits | Bun | | Encore.ts kits | Node + Encore runtime | Most premium boilerplates list Bun as the recommended `packageManager` even when production runs on Node. The dev-loop benefit is real; the deploy story sticks with Node. For broader backend-runtime context, see [Encore.ts vs Hono vs Elysia](/guides/encore-ts-vs-hono-vs-elysia-type-safe-backend-starters-2026). ## Migration Notes - **Node → Bun (greenfield)**: just `bun init` — most code is identical. Edge cases: `__dirname` in ESM (Bun supports it; "modern" Node ESM doesn't), `import.meta.dir` (Bun extension). - **Node → Bun (existing boilerplate)**: usually trivial for the runtime swap; the bundler swap is more work if you want Bun.build. - **Node → Deno**: heavier — `deno.json` instead of `package.json` (or use the npm: specifier), permission flags everywhere. - **Bun → Node**: easy in reverse if you avoid Bun-specific APIs (`Bun.serve`, `Bun.password`, `Bun.file`). ## What to Pick - **You want the safest production deploy** → Node 22 LTS. - **You're starting fresh and want the fastest dev loop** → Bun for dev, decide on deploy by host support. - **You ship to AWS Lambda heavily** → Node 22. - **You want strict permission boundaries baked into the runtime** → Deno 2. - **Your boilerplate is Hono- or Elysia-native** → Bun. For a typical 2026 SaaS boilerplate path: **`bun install` + `bun run dev` locally, deploy to Vercel/Railway with Node**. You get Bun's speed without betting your production on it. ## FAQ **Can my [premium SaaS boilerplate](/guides/best-saas-starter-kits-ranked-2026) run on Bun?** Probably yes — most do today. Check the README and CI for explicit Bun support; if absent, expect a small package compatibility chase. **Does Next.js officially support Bun?** Yes — `bun run next dev` and `bun run next build` work. Some plugins assume Node `process.binding` quirks; verify your specific plugins. **What about pnpm vs Bun for monorepos?** Both are excellent. Bun's workspace handling is solid in 1.x; pnpm is more battle-tested for very large monorepos. See [the best monorepo boilerplates](/guides/best-monorepo-boilerplates-2026) for repo-shaped guidance. **Will Node 22 LTS still matter in 2027?** Maintenance LTS through April 2027. By then Node 24 LTS will be the active line. The ecosystem gravity isn't shifting. --- *If you're deciding the broader stack, see the [ideal tech stack for SaaS in 2026](/guides/ideal-tech-stack-saas-2026) for how runtime choice fits with framework, ORM, and hosting decisions.*