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🏕️ A peaceful web framework for Gleam that targets JS.

✨ Features:

…and other nice-to-haves!


Install all requirements:

gleam add glen gleam_http gleam_javascript

Or just Glen:

gleam add glen


import gleam/javascript/promise.{type Promise}
import glen
import glen/status

pub fn main() {
 glen.serve(handle_req, 8000)

fn handle_req(req: glen.Request) -> Promise(glen.Response) {
 "<h1>Welcome to my webpage!</h1>
 <p>Make yourself at home 😄</p>"
 |> glen.html(status.ok)
 |> promise.resolve

Glen is heavily based off of Wisp, and many of Wisp’s examples can easily be ported to Glen. Glen also has an example application of its own in ./test.

Bring-your-own server

Glen’s serve function only works on the deno runtime, but you can bring your own server so Glen can work on any runtime, such as Node.js (>= v17.0.0) or Cloudflare Workers. The convert_request and convert_response functions are here to help you with this.

Cloudflare Workers example

Glen’s static middleware will not work on the Cloudflare Workers runtime since it does not support the node:fs module. Everything else should work as expected.


import * as glen from '../glen/glen.mjs';
import * as my_app from './my_app.mjs';

export default {
 async fetch(request, _env, _ctx) {
   const req = glen.convert_request(request);
   const response = await my_app.handle_req(req);
   const res = glen.convert_response(response);

   return res;


import gleam/javascript/promise
import glen
import glen/status

pub fn handle_req(_req) {
 "On a Cloudflare worker!"
 |> glen.html(status.ok)
 |> promise.resolve


main = "build/dev/javascript/my_app/index.js"
# ...


Documentation can be found at


gleam run   # Run the project
gleam test  # Run the example application
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