Errors

Errors

app.onError((err, c) => {
  c.status(500).json({ message: err.message });
});

An error thrown anywhere in the chain (middleware, handler, response) lands here.

Fallback behavior:

• No onError registered, or the handler never responds, or the handler itself throws: built-in 500 Internal Server Error.
• Headers already sent: socket destroy.

The built-in 405 error carries .allow (the Allow header value), so custom bodies are easy:

app.onError((err, c) => {
  if ("allow" in err) {
    c.status(405).header("allow", err.allow).text("method not allowed");
    return;
  }
  c.status(500).text("boom");
});