errorHandler

JSFunction errorHandler()

Express error handler middleware.

Catches all AppError instances and sends appropriate JSON responses. Unknown errors are logged and returned as 500 Internal Server Error.

Implementation

JSFunction errorHandler() =>
    ((JSAny? err, Request req, Response res, JSNextFunction next) {
      if (err == null) {
        next.call();
        return;
      }
// Try to extract the Dart error
final dartError = err.dartify();
final (int status, Map<String, dynamic> body) = switch (dartError) {
AppError e => (e.statusCode, e.toJson()),
_ => (
500,
{
'success': false,
'error': {
'message': 'Internal server error',
'statusCode': 500,
},
},
),
};
res
..status(status)
..jsonMap(body);
}).toJS;