res.end() Function

res.end() finishes the response process. It comes straight from Node's core http.ServerResponse, and can be used with or without data.

Syntax

res.end([data[, encoding]][, callback])

Example

const express = require("express");
const app = express();
const PORT = 4800;

app.use("/ping", (req, res, next) => {
    console.log("ping middleware hit");
    res.end("pong");
});

app.listen(PORT, () => console.log(`Listening on ${PORT}`));

Use cases

• Ending a response without sending a body.
• Finishing a response after writing data manually with lower-level methods.
• Explicitly terminating the response inside middleware.