What is a Socket Hang Up?

The 'socket hang up' error occurs in Node.js when an HTTP connection is closed by the server before a complete response is received. It is closely related to ECONNRESET and typically means the server closed the socket prematurely.

Why it happens

• •The server closes the connection before finishing the response body.
• •A reverse proxy (nginx, load balancer) times out and terminates the connection.
• •The server crashes while processing the request.
• •Not draining the request body on the server side causes the client to time out.

Examples

const http = require("http");
const req = http.get("http://example.com/api", (res) => {
  res.resume();
});
req.end();
// Server closes connection before sending full response

Error: socket hang up
    code: 'ECONNRESET'

const http = require("http");
const req = http.get("http://example.com/api", (res) => {
  let body = "";
  res.on("data", (chunk) => { body += chunk; });
  res.on("end", () => console.log(body));
});
req.on("error", (err) => {
  console.error("Request failed:", err.message);
});

Related errors

• ECONNRESET
• ETIMEDOUT
• Fetch Network Error