--- title: Elysia.js: Type-Safe APIs Without the Mess | daily.dev description: Elysia.js is a TypeScript-first API framework for Bun that addresses Next.js API route organization issues by allowing all routes to be defined in a single... canonical: https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Elysia.js: Type-Safe APIs Without the Mess | daily.dev og:description: Elysia.js is a TypeScript-first API framework for Bun that addresses Next.js API route organization issues by allowing all routes to be defined in a single... og:url: https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2 og:image: https://api.daily.dev/og/posts/pGvKxqMl2.png og:image:alt: Elysia.js: Type-Safe APIs Without the Mess og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Elysia.js: Type-Safe APIs Without the Mess **[Atomic Spin](https://daily.dev/sources/atomicobject)** · 3 min read · 52 upvotes · 2 comments ## Summary Elysia.js is a TypeScript-first API framework for Bun that addresses Next.js API route organization issues by allowing all routes to be defined in a single file using a chaining syntax. It provides end-to-end type safety through the Eden companion library, eliminating the need for code generation while maintaining standard HTTP endpoints. The framework uses TypeBox for inline schema validation that doubles as TypeScript type generation, and follows the WinterTC standard for cross-runtime deployment compatibility. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@apperside** · 0 upvotes > Almost finished a project where I used it, I liked it a lot, strong typing on endpoints is really amazing, and I also liked a lot the way it handles server sent events. > > If you are starting a new backend project, I really recommend to give it a shot **@rujorgensen** · 0 upvotes > I use it for all my new personal projects, and converted existing ones as well. Can highly recommend 👍. ## Similar posts on daily.dev - [When to move API logic out of Next.js](https://daily.dev/posts/when-to-move-api-logic-out-of-next-js-sv0smf4zj) · LogRocket · 55 upvotes · 1 comments - [Support for Elysia](https://daily.dev/posts/support-for-elysia-io5dabp2o) · Vercel · 94 upvotes · 1 comments --- Tags: [#typescript](https://daily.dev/tags/typescript), [#nextjs](https://daily.dev/tags/nextjs), [#bun](https://daily.dev/tags/bun) [View this post on daily.dev](https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Elysia.js: Type-Safe APIs Without the Mess","url":"https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2"},"datePublished":"2026-01-20T13:04:44.393Z","dateModified":"2026-01-20T13:05:03.847Z","description":"Elysia.js is a TypeScript-first API framework for Bun that addresses Next.js API route organization issues by allowing all routes to be defined in a single...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/da1cfd07c2a6e08c70cc9e9e6521ec55?_a=AQAEulh","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/da1cfd07c2a6e08c70cc9e9e6521ec55?_a=AQAEulh","isAccessibleForFree":true,"articleSection":"Atomic Spin","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Atomic Spin","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/e2af5ce3adaa403a8cf029268b62419f","url":"https://daily.dev/sources/atomicobject"},"commentCount":2,"discussionUrl":"https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":52},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":2}],"keywords":"typescript,nextjs,bun","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Atomic Spin","item":"https://daily.dev/sources/atomicobject"},{"@type":"ListItem","position":3,"name":"Elysia.js: Type-Safe APIs Without the Mess"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/elysia-js-type-safe-apis-without-the-mess-pgvkxqml2","comment":[{"@type":"Comment","text":"Almost finished a project where I used it, I liked it a lot, strong typing on endpoints is really amazing, and I also liked a lot the way it handles server sent events.\nIf you are starting a new backend project, I really recommend to give it a shot","datePublished":"2026-02-11T06:05:59.704Z","url":"https://daily.dev/posts/pGvKxqMl2#c-WJzwGDpIG","author":{"@type":"Person","name":"Apperside","url":"https://daily.dev/apperside","image":"https://avatars.githubusercontent.com/u/5955338?v=4"}},{"@type":"Comment","text":"I use it for all my new personal projects, and converted existing ones as well. Can highly recommend 👍.","datePublished":"2026-02-13T10:26:12.032Z","url":"https://daily.dev/posts/pGvKxqMl2#c-9wfvHZphm","author":{"@type":"Person","name":"RJ","url":"https://daily.dev/rujorgensen","image":"https://lh3.googleusercontent.com/a/ACg8ocIX0FMQ5dZ_ie8ljouGWJQvP3wbIrYt5XnsaQf0l2ttkPDsSXLt=s96-c"}}]} ```