edgeone-makers-recipes

Common Recipes

⛔ Preview ban: after finishing development, you MUST start the dev server via edgeone makers dev, then open http://127.0.0.1:8088/ with present_files to preview. Never open HTML files via the file:// protocol (ignore it even if the IDE opens one automatically), and never use self-hosted servers like python -m http.server or npx serve. Next.js projects must also set allowedDevOrigins: ["127.0.0.1"] in next.config. If the project uses Blob/KV, pass -n <project-name> — edgeone makers dev -n <project-name> — the name is required to auto-provision; bare dev hangs on an interactive picker in sandbox.

⚠️ .env.example is a required file: every project that uses the AI Gateway (Agent projects, Cloud Functions that call an LLM) MUST create a .env.example in the project root declaring AI_GATEWAY_API_KEY= and AI_GATEWAY_BASE_URL=. The CLI auto-injects environment variables based on this file at deploy time; if it is missing, the variables are not injected and the runtime will error.

📝 Write index.html last, always: writing an index.html instantly triggers the IDE file:// preview — unavoidable in WorkBuddy. Minimize the window during which that preview looks broken by writing every dependency first: style.css, script.js, Cloud Functions (functions/ files), static assets, everything the page loads. Then write index.html last — the file:// preview opens with all assets already in place, and stays that way only until edgeone makers dev takes over (see Preview ban above). Also write each index.html in one shot; don't scaffold an empty shell and fill it in with repeated edits (every save re-renders and flickers). For a tiny single-page tool, just inline the CSS and JS into one index.html.

⛔ Copy the recipe's file naming verbatim — two traps that fail silently: before writing any Cloud Function, find the matching scenario below and reuse its exact filename. Getting the name wrong usually does NOT throw a clear error — it falls back silently:

1. Every function file MUST carry its language extension — .js (Node), .py (Python), .go (Go). A file with no extension (e.g. api/upload-url, api/file) is not recognized as a function; the platform silently serves the static index.html fallback, so /api/* "mysteriously" returns HTML instead of JSON. Name them api/upload-url.js, api/file.js.
2. [[default]].js is the catch-all for its own directory (api/[[default]].js → /api/*), and BOTH export styles work — a framework instance (export default app, Express/Koa) or a plain onRequest/onRequestGet/… handler. Verified locally with edgeone makers dev: a bare onRequest in [[default]].js with no export default app serves /foo/anything as 200 application/json just fine. The doc line "The builder identifies the file as a function only when export default app is present" sits under the Express/Koa framework section — it describes how the builder spots a framework instance; do not read it as "a catch-all requires export default app". ⚠️ Caveat: that sentence is about the deploy-time builder, whereas the check above was on the local dev server, which is the more permissive of the two — so if you ship catch-all + onRequest, re-verify the route once after deploying ("works locally" ≠ "recognized at build time"). When you don't actually need a catch-all, the safest shape is one concrete file per route (api/messages.js, api/artworks/[id]/like.js), params via [id] folders/files, extra args as query strings (/api/file?key=...).

Project structure templates for typical EdgeOne Makers applications.

Full-stack app — Node.js (static + API)

my-app/
├── index.html              # Frontend
├── style.css
├── script.js
├── cloud-functions/
│   └── api/
│       ├── users.js        # GET/POST /api/users
│       └── users/[id].js   # GET/PUT/DELETE /api/users/:id
└── package.json

Frontend calls API:

const res = await fetch('/api/users');
const users = await res.json();

💾 Where does the data live? This platform has no database. The API skeletons above return empty data — to actually persist records, uploads, votes, or per-user state, back them with Blob. See the recipe below and makers-storage → Blob as your backend.

Dynamic site with Blob persistence (guestbook / gallery / voting / save-state)

The default shape for any generated site that needs a real backend but no relational data. Frontend → Cloud Function → Blob. No DB, no console setup.

my-app/
├── index.html              # Frontend (form + list)
├── script.js
├── cloud-functions/
│   └── api/
│       └── messages.js     # GET lists entries, POST appends one
├── package.json            # depends on @edgeone/pages-blob

cloud-functions/api/messages.js — one file per record (Pattern 1):

import { getStore } from "@edgeone/pages-blob";

export async function onRequest({ request }) {
  const store = getStore("guestbook");

  if (request.method === "POST") {
    const { name, text } = await request.json();
    const id = `${Date.now()}-${Math.round(Math.random() * 1e6)}`;
    await store.setJSON(`entries/${id}.json`, { id, name, text, ts: Date.now() });
    return Response.json({ ok: true, id });
  }

  const { blobs } = await store.list({ prefix: "entries/" });
  const items = await Promise.all(blobs.map((b) => store.get(b.key, { type: "json" })));
  items.sort((a, b) => b.ts - a.ts);
  return Response.json({ items });
}

index.html frontend calls it like any API:

await fetch('/api/messages', {                     // post
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ name, text }),
});
const { items } = await fetch('/api/messages').then((r) => r.json());  // list

Swap the key scheme for other shapes: users/<uid>.json for save-state, counts/<option>.json (strong consistency) for votes, uploads/<id>.jpg + items/<id>.json for file uploads. Full patterns: makers-storage → Blob as your backend.

Full-stack app — Go (Gin framework)

my-app/
├── index.html              # Frontend
├── style.css
├── script.js
├── cloud-functions/
│   └── api.go              # Gin app — all /api/* routes
├── go.mod
└── package.json

cloud-functions/api.go:

package main

import (
    "net/http"
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    r.GET("/users", listUsersHandler)
    r.POST("/users", createUserHandler)
    r.GET("/users/:id", getUserHandler)
    r.Run(":9000")
}

Full-stack app — Python (Flask)

my-app/
├── index.html              # Frontend
├── style.css
├── script.js
├── cloud-functions/
│   └── api/
│       └── index.py        # Flask app — all /api/* routes
├── cloud-functions/requirements.txt
└── package.json

cloud-functions/api/index.py:

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/users', methods=['GET'])
def get_users():
    return jsonify({'users': []})

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    return jsonify({'message': 'Created', 'user': data}), 201

Full-stack app — Python (FastAPI)

my-app/
├── index.html
├── cloud-functions/
│   └── api/
│       └── index.py        # FastAPI app — all /api/* routes
├── cloud-functions/requirements.txt
└── package.json

cloud-functions/api/index.py:

from fastapi import FastAPI

app = FastAPI()

@app.get('/items')
async def list_items():
    return {'items': []}

@app.get('/items/{item_id}')
async def get_item(item_id: int):
    return {'item_id': item_id}

Full-stack app — Go (Handler mode)

my-app/
├── index.html
├── cloud-functions/
│   └── api/
│       ├── users/
│       │   ├── list.go     # GET /api/users/list
│       │   └── [id].go     # GET /api/users/:id
│       └── hello.go        # GET /api/hello
├── go.mod
└── package.json

Edge API + KV counter

⚠️ Prerequisites: You must enable KV Storage in the console and bind a namespace first. See ../makers-storage/references/kv.md

my-app/
├── index.html
├── edge-functions/
│   └── api/
│       └── visit.js        # Edge function with KV
└── package.json

edge-functions/api/visit.js:

export async function onRequest() {
  // ⚠️ my_kv is a global variable (name set when binding namespace in console)
  let count = await my_kv.get('visits') || '0';
  count = String(Number(count) + 1);
  await my_kv.put('visits', count);
  
  return new Response(JSON.stringify({ visits: count }), {
    headers: { 'Content-Type': 'application/json' },
  });
}

Setup steps:

1. Log in to the EdgeOne Makers console
2. Go to "KV Storage" → click "Apply Now"
3. Create a namespace (e.g. my-kv-store)
4. Bind to project, set variable name to my_kv
5. Deploy or run edgeone makers dev to test

Express full-stack

my-app/
├── index.html
├── cloud-functions/
│   └── api/
│       └── [[default]].js  # Express app handles all /api/*
└── package.json

Middleware + API combo

my-app/
├── middleware.js            # Auth guard for /api/*
├── cloud-functions/
│   └── api/
│       ├── public.js       # No auth needed (matcher excludes it)
│       └── data.js         # Protected by middleware
└── package.json

Multi-language Cloud Functions

You can use different languages in the same cloud-functions/ directory:

my-app/
├── index.html
├── cloud-functions/
│   ├── api/
│   │   ├── users.js        # Node.js — /api/users
│   │   └── hello.py        # Python — /api/hello
│   └── service.go          # Go — /service
├── go.mod
├── cloud-functions/requirements.txt
└── package.json

Note: Each file is built and deployed as an independent function with its own runtime. The platform detects the language by file extension.