服务一个网页框架
Deno Sandboxes provide a sandboxed environment for evaluating JavaScript code. This is useful for evaluating code that is not trusted or for testing code that is not safe to run in the main runtime.
在沙箱中，你可以创建一个 package.json，安装依赖，运行网页框架（Express），并通过 HTTP 将其公开。
此示例展示如何在沙箱内创建一个最简 Express 应用，运行在 3000 端口，并通过 sandbox.exposeHttp() 对外公开。
import { Sandbox } from "@deno/sandbox";
await using sandbox = await Sandbox.create();
// 1) 在沙箱中写入 package.json 和 server.js
const PACKAGE_JSON = {
name: "sandbox-express-demo",
private: true,
type: "module",
dependencies: { express: "^4.19.2" },
};
await sandbox.writeTextFile(
"package.json",
JSON.stringify(PACKAGE_JSON, null, 2),
);
await sandbox.writeTextFile(
"server.js",
`import express from 'express';
const app = express();
app.get('/', (req, res) => res.send('Hello from Express in @deno/sandbox!'));
app.get('/time', (req, res) => res.json({ now: new Date().toISOString() }));
app.listen(3000, () => console.log('listening on :3000'));
`,
);
// 2) 安装依赖
await sandbox.sh`deno install`;
// 3) 启动服务器
const server = await sandbox.createJsRuntime({ entrypoint: "server.js" });
// 4) 对外发布
const publicUrl = await sandbox.exposeHttp({ port: 3000 });
console.log("公开 URL:", publicUrl); // 例如 https://<random>.sandbox.deno.net
// 从你的本地机器 fetch 以验证
const resp = await fetch(`${publicUrl}/time`);
console.log(await resp.json());
// 在你需要时保持进程活跃；完成时，关闭沙箱
// 会关闭服务器。
For more information about Sandboxes, see the Sandboxes documentation.