\n| Build (esbuild equivalent)<\/td>\n | 1.8s<\/td>\n | 0.4s<\/td>\n | 4.5x faster<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n The package install speed is the number that changes developer experience most immediately. `bun install` on a project that takes 45 seconds with npm takes 8 seconds. In CI\/CD where you’re doing this constantly, this is a genuine time and cost saving.<\/p>\n Where Bun Makes Sense Right Now<\/h2>\nDevelopment Tooling and Scripts<\/h3>\nThe safest and highest-value switch: use Bun as your package manager and script runner for existing Node.js projects without changing your runtime.<\/p>\n # In any existing Node.js project\r\n# Replace: npm install \u2192 bun install\r\n# Replace: npm run dev \u2192 bun run dev\r\n# Replace: npx jest \u2192 bun test\r\n\r\n# package.json stays the same\r\n# node_modules are still created\r\n# Your Node.js code doesn't change\r\n\r\n# Just faster installs and script startup<\/code><\/pre>\nThis works in 99% of projects today with zero risk. The only thing that changes is speed.<\/p>\n New API Projects (Hono + Bun)<\/h3>\nStarting a new API server? Hono + Bun is one of the fastest combinations available and entirely production-viable:<\/p>\n bun create hono my-api\r\ncd my-api\r\nbun install\r\nbun run dev<\/code><\/pre>\n\/\/ src\/index.ts\r\nimport { Hono } from 'hono';\r\n\r\nconst app = new Hono();\r\n\r\napp.get('\/', (c) => c.text('Hello from Bun + Hono!'));\r\n\r\napp.get('\/health', (c) => c.json({\r\n status: 'ok',\r\n runtime: process.versions.bun ?? 'node',\r\n}));\r\n\r\nexport default {\r\n port: 3000,\r\n fetch: app.fetch,\r\n};<\/code><\/pre>\nScripts and Automation<\/h3>\nReplace Node.js scripts with Bun for faster startup:<\/p>\n #!\/usr\/bin\/env bun\r\n\/\/ scripts\/migrate-data.ts\r\nimport { Database } from 'bun:sqlite'; \/\/ Built-in SQLite, no npm install\r\n\r\nconst db = new Database('data.sqlite');\r\n\r\nconst users = db.query('SELECT * FROM users WHERE migrated = 0').all();\r\nconsole.log(`Migrating ${users.length} users...`);\r\n\r\n\/\/ ... migration logic\r\n\r\nconsole.log('Done!');<\/code><\/pre>\nCI\/CD Pipelines<\/h3>\nThe fastest win: switch your CI install step from npm to bun:<\/p>\n # .github\/workflows\/ci.yml\r\n- name: Setup Bun\r\n uses: oven-sh\/setup-bun@v2\r\n with:\r\n bun-version: latest\r\n\r\n- name: Install dependencies\r\n run: bun install --frozen-lockfile\r\n\r\n- name: Run tests\r\n run: bun test\r\n\r\n- name: Build\r\n run: bun run build<\/code><\/pre>\nNo code changes. Just faster CI runs \u2014 typically 30\u201350% faster overall pipeline time.<\/p>\n Where to Be Careful<\/h2>\nExisting Large Node.js Applications<\/h3>\nThe 5% incompatibility in Bun 2.0 is real and can be painful. Common issues:<\/p>\n \n- Packages that use
__dirname<\/code> in ESM modules (Node.js-specific behaviour)<\/li>\n- Some native Node.js addons (though N-API support improved significantly)<\/li>\n
- Packages that rely on specific Node.js error message formatting<\/li>\n
- Some stream implementations behave differently<\/li>\n<\/ul>\n
Before migrating: run your test suite under Bun. If it passes, the migration is probably safe. If tests fail, investigate before deploying to production.<\/p>\n # Test your existing Node.js project with Bun\r\nbun test # Runs Jest-compatible tests\r\n# Or run your test script\r\nbun run test<\/code><\/pre>\nExpress.js Applications<\/h3>\nExpress.js itself runs on Bun, but some Express middleware uses Node.js internals. Test specifically:<\/p>\n \n- Session middleware<\/li>\n
- File upload middleware (multer)<\/li>\n
- Authentication middleware (passport)<\/li>\n<\/ul>\n
The Honest Assessment<\/h2>\nSwitch to Bun as package manager immediately:<\/strong> Zero risk, instant benefit, works with any project. `bun install` instead of `npm install` is the easiest performance win in the JavaScript ecosystem right now.<\/p>\nUse Bun runtime for new TypeScript\/JavaScript API projects:<\/strong> Hono + Bun is production-ready and excellent. Good choice for new projects where you’re not constrained by existing dependencies.<\/p>\nMigrate existing production Node.js apps carefully:<\/strong> Run your test suite under Bun first. If everything passes, migration is probably safe. If tests fail, those failures indicate real compatibility issues. Don’t migrate without a solid test suite.<\/p>\nFor Laravel backends (PHP):<\/strong> Bun replaces npm for your frontend assets. Use `bun install` instead of `npm install` in your Laravel projects. Run `bun run build` instead of `npm run build`. This works today with Vite + Laravel Plugin with no changes required.<\/p>\n# In your Laravel project \u2014 just use bun instead of npm\r\nbun install # Instead of npm install\r\nbun run dev # Instead of npm run dev\r\nbun run build # Instead of npm run build\r\n\r\n# Everything else stays the same<\/code><\/pre>\nIf you’re setting up a new JavaScript API project or want advice on modernizing your build toolchain, our team at Softcrony is happy to help<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"Bun has been promising to replace Node.js for two years. Bun 2.0 is the version where the conversation gets serious. It’s not a toy anymore \u2014 it’s running in production at real companies, it ships 95%+ Node.js compatibility, and the performance numbers are genuinely significant. But “should you switch” is the wrong question. The right […]<\/p>\n","protected":false},"author":1,"featured_media":178,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[144,53,50,145,35,146],"class_list":["post-176","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","tag-bun","tag-devops","tag-javascript","tag-node-js","tag-performance","tag-runtime"],"_links":{"self":[{"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/posts\/176","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/comments?post=176"}],"version-history":[{"count":0,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/posts\/176\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/media\/178"}],"wp:attachment":[{"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/media?parent=176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/categories?post=176"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softcrony.com\/blog\/wp-json\/wp\/v2\/tags?post=176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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