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TCP echo Server



This is an example of a server which accepts connections on port 8080, and returns to the client anything it sends.

 * echo_server.ts
const listener = Deno.listen({ port: 8080 });
console.log("listening on");
for await (const conn of listener) {

Run with:

deno run --allow-net echo_server.ts

To test it, try sending data to it with netcat (Linux/MacOS only). Below 'hello world' is sent over the connection, which is then echoed back to the user:

$ nc localhost 8080
hello world
hello world

Like the cat.ts example, the pipeTo() method here also does not make unnecessary memory copies. It receives a packet from the kernel and sends back, without further complexity.