To mitigate the risk of Brute Force Login Using Alias Batching attacks, consider implementing the following measures:

- **Limit Aliases**: Configure server-side limits on the number of aliases allowed in a single GraphQL query. You can configure tools like GraphQL Armor to limit aliases and prevent overloading.

- **Implement CAPTCHA**: Introduce CAPTCHA or other user verification mechanisms to challenge users after a certain number of failed login attempts, adding an additional layer of protection.

=== "JavaScript"
  ```javascript
    // Configuring rate limiting and alias limits for a GraphQL server
    const express = require('express');
    const rateLimit = require('express-rate-limit');
    const { ApolloServer, gql } = require('apollo-server-express');
    const { GraphQLArmorConfig } = require('graphql-armor');
    
    const app = express();
    
    // Rate limit for login attempts
    const loginLimiter = rateLimit({
      windowMs: 15 * 60 * 1000, // 15 minutes
      max: 5, // limit each IP to 5 requests per windowMs
      message: "Too many login attempts, please try again later."
    });
    
    // Define your GraphQL schema
    const typeDefs = gql`
      type Query {
        login(username: String!, password: String!): String
      }
    `;
    
    // Implement the alias limit configuration
    GraphQLArmorConfig({
      maxAliases: {
        enabled: true,
        n: 20, // Set the maximum number of aliases allowed per query
        onAccept: [],
        onReject: [],
        propagateOnRejection: true,
      }
    });
    
    const server = new ApolloServer({ typeDefs, resolvers });
    
    // Apply rate limiter middleware
    app.use('/graphql', loginLimiter);
    
    server.applyMiddleware({ app });
    
    app.listen({ port: 4000 }, () =>
      console.log(`Server ready at http://localhost:4000${server.graphqlPath}`)
    );
  ```


=== "Python"
  ```python
    import graphql
    from graphql.language import ast
    from graphql.language import parser
    from settings import api
    
    def validate_aliases(query: str) -> None:
        """
        This validation prevents the execution of queries containing an excessive
        number of aliases to prevent server overload.
        """
        class AliasesParser(parser.Parser):
            def parse_aliases(self) -> list[ast.FieldNode]:
                aliases = 0
                while self.peek(graphql.TokenKind.NAME):
                    aliases += 1
                    if aliases > api.API_MAX_ALIASES:
                        raise graphql.GraphQLError("Exception - Max aliases exceeded")
                    self.parse_field()
                return []
    
        ast_parser = AliasesParser(query)
        ast_parser.parse_document()

  ```