Fastro

Fast and simple web application framework for deno.

With near-native perfomance, you can manage your routing, middlewares, and dependencies cleanly. You can also take advantage of existing the standard deno objects and methods: Request, Response, Headers, and Cookie.

Examples

Getting started

import application from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.get("/", () => "Hello world")

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/main.ts

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Custom port

import application from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.get("/", () => "Hello world!")

await app.serve({ port: 3000 })
deno run -A https://deno.land/x/fastro@v0.51.2/examples/custom_port.ts

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HTML Response

import application from "https://deno.land/x/fastro@v0.51.0/server/mod.ts"

const app = application()

app.get("/", () => {
  return new Response("<html> Hello world </html>", {
    status: 200,
    headers: {
      "content-type": "text/html",
    },
  })
})

console.log("Listening on: http://localhost:8000")

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/html_response.ts

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Render with Eta Template Engine

import application from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"
import { render } from "https://deno.land/x/eta@v1.12.3/mod.ts"

const app = application()

const headers = new Headers()
headers.set("Content-Type", "text/html charset=UTF-8")

app.get("/", () => {
  const html = <string> render(
    "<h4>The answer to everything is <%= it.answer %></h4>",
    {
      answer: 42,
    },
  )

  return new Response(html, { headers })
})

console.log("Listening on: http://localhost:8000")

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/render.ts

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import {
  Cookie,
  deleteCookie,
  getCookies,
  setCookie,
} from "https://deno.land/std@0.133.0/http/cookie.ts"

import application from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.post("/", () => {
  const headers = new Headers()
  const cookie: Cookie = { name: "Space", value: "Cat" }
  setCookie(headers, cookie)

  return new Response(JSON.stringify(cookie), { headers })
})

app.get("/", (req: Request) => {
  const headers = req.headers
  const cookies = getCookies(headers)

  return new Response(JSON.stringify(cookies))
})

app.delete("/", () => {
  const headers = new Headers()
  deleteCookie(headers, "Space")
  const cookies = getCookies(headers)

  return new Response(JSON.stringify(cookies), {
    headers,
  })
})

console.log("Listening on: http://localhost:8000")

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/cookies.ts

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Routing

import application from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.get("/abcd", () => new Response("/abcd"))

app.get("/ef?gh", () => new Response("/ef?gh"))

app.get("/ij+kl", () => new Response("/ij+kl"))

app.get("/mn*op", () => new Response("mn*op"))

app.get("/qr(st)?u", () => new Response("qr(st)?u"))

app.get(/v/, () => new Response("/v/"))

app.get(/.*fast$/, () => new Response("/.*fast$/"))

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/routing.ts

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Route parameters

import application, {
  getParam,
  getParams,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.get("/:id/user/:name", (req: Request) => {
  const params = getParams(req)
  return new Response(JSON.stringify({ params }))
})

app.get("/post/:id", (req: Request) => {
  const param = getParam("id", req)
  return new Response(param)
})

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/route_params.ts

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Router Middleware

import application, {
  ConnInfo,
  Next,
  router,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()
const r = router()
const middleware = (_req: Request, _connInfo: ConnInfo, next: Next) => {
  console.log("v2 - 1")
  next()
}

r.get("/", () => new Response("Get"))
  .post("/", () => new Response("Post"))
  .put("/", () => new Response("Put"))
  .delete("/", () => new Response("Delete"))

app.use("/v1", r)
app.use("/v2", middleware, r)

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/router_middleware.ts

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Router Middleware with Array

import application, {
  ConnInfo,
  Next,
  router,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()
const r = router()
const middlewares = [(_req: Request, _connInfo: ConnInfo, next: Next) => {
  console.log("v2 - 1")
  next()
}, (_req: Request, _connInfo: ConnInfo, next: Next) => {
  console.log("v2 - 2")
  next()
}]

r.get("/", () => new Response("Get"))
  .post("/", () => new Response("Post"))
  .put("/", () => new Response("Put"))
  .delete("/", () => new Response("Delete"))

app.use("/v1", r)
app.use("/v2", middlewares, r)

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/router_middleware_with_array.ts

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Application Level Middleware

import application, {
  ConnInfo,
  Next,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

app.use((_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("app middleware #1")
  next()
})

app.use((_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("app middleware #2")
  next()
})

app.use((_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("app middleware #3")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("app middleware #4")
  next()
})

app.get("/", () => new Response("App level #1"))

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/application_level_middleware.ts

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Application Level Middleware with Array

import application, {
  ConnInfo,
  Next,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

const middlewares = [(_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #1")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #2")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #3")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #4")
  next()
}]

app.use(middlewares)

app.get("/", () => new Response("App level #1"))

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/application_level_middleware_with_array.ts

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Route Level Middleware

import application, {
  ConnInfo,
  Next,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

const middlewares = (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #1")
  next()
}

app.get("/", middlewares, () => new Response("App level #1"))

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/route_level_middleware.ts

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Route Level Middleware with Array

import application, {
  ConnInfo,
  Next,
} from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"

const app = application()

const middlewares = [(_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #1")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #2")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #3")
  next()
}, (_req: Request, _conn: ConnInfo, next: Next) => {
  console.log("middleware #4")
  next()
}]

app.get("/mnop", middlewares, () => new Response("Route level middleware #3"))

await app.serve()
deno run -A https://deno.land/x/fastro@v0.51.2/examples/route_level_middleware_with_array.ts

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SQLite and Dependency Injection

import application, { dependency } from "https://deno.land/x/fastro@v0.51.2/server/mod.ts"
import { DB } from "https://deno.land/x/sqlite@v3.3.0/mod.ts"

const app = application()
const db = new DB("test.db")

const deps = dependency()
deps.set("hello", () => "Hello world")
deps.set("db", db)
app.use(deps)

app.get("/", () => {
  type FunctionType = () => string
  const fn = <FunctionType> app.getDeps("hello")
  return new Response(fn())
})

app.post("/name", () => {
  const db = <DB> app.getDeps("db")
  db.query(`CREATE TABLE IF NOT EXISTS people (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT)`)

  const names = ["Peter Parker", "Clark Kent", "Bruce Wayne"]
  for (const name of names) {
    db.query("INSERT INTO people (name) VALUES (?)", [name])
  }

  return new Response(JSON.stringify(names))
})

app.get("/name", () => {
  const db = <DB> app.getDeps("db")
  const res = db.query("SELECT name FROM people")
  return new Response(JSON.stringify(res))
})

console.log("Listening on: http://localhost:8000")

await app.serve()

deno run -A https://deno.land/x/fastro@v0.51.2/examples/deps_injection.ts

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