baguette

Getting started

baguette is a blazingly fast, zero-config API framework for Bun and Hono. You drop a file into a directory and get back a fully typed, validated, and documented HTTP endpoint. One zod declaration is the single source of truth for runtime validation, TypeScript types, the OpenAPI spec, and the error funnel.

This page takes you from an empty directory to a running, documented, type-safe route in about 60 seconds.

Install

bun add @prehoy/baguette

baguette re-exports z and createRoute so your app shares the exact zod version the framework validates with. Never install zod separately.

Your first typed route in 60 seconds

1. Create a route

The file's location is the URL. Create api/hello.ts:

// api/hello.ts  ->  GET /api/hello
import { defineRoute, z } from "@prehoy/baguette";

export default defineRoute({
  method: "get",
  request: { query: z.object({ name: z.string().default("world") }) },
  response: z.object({ greeting: z.string() }),
  handler: (c, { query }) => c.json({ greeting: `Hello, ${query.name}!` }),
});

query arrives already validated and typed as { name: string }. There is no manual parsing, and no way to read an unvalidated value by accident.

2. Start the server

Point serve() at your routes directory. Create server.ts:

// server.ts
import { serve } from "@prehoy/baguette";

serve({ routesDir: "./api" });

bun run server.ts

Routes are imported in parallel at boot and mounted by convention. Nothing to register.

3. Call it

curl 'http://localhost:3000/api/hello?name=Ada'
# { "greeting": "Hello, Ada!" }

curl 'http://localhost:3000/api/hello?name='
# 400 — validation failed, before your handler ever ran

4. Read the docs it wrote for itself

Open http://localhost:3000/api/docs for a live Scalar UI, or /api/doc for the raw OpenAPI spec. Both are generated from your zod schemas — there is nothing to hand-maintain and nothing to keep in sync.

What you get from that one declaration

  • Runtime validation — invalid params, query, or body return 400 before your handler runs.
  • Inferred types — the handler's second argument is typed from your schemas. No casts.
  • OpenAPI + Scalar docs — served automatically at /api/docs and /api/doc.
  • Error funnel — an unhandled throw becomes a clean 500 in one predictable place.

Where things live

baguette apps follow one directory layout:

  • api/ — HTTP routes. One defineRoute per file.
  • cron/ — optional scheduled jobs.
  • automations/ — optional event-driven jobs.
  • methods/ (or lib/) — shared helpers and business logic.

Each layer is independently optional. If a directory doesn't exist, its code is never imported.

Next steps

  • defineRoute — the full route contract: params, query, body, multi-status responses, tags.
  • serve — configuring the server and auto-wiring the optional layers.
  • CLI — scaffold routes, cron, and automations with baguette new.
  • Clean-code contract — the conventions that keep an AI (or a human) from making a mess.