Examples

This guide provides real-world examples demonstrating how to use Bantai for various use cases, from basic validation to complex business logic.

Example Categories

• Basic Validation - Age eligibility, password validation
• Access Control - Role-based access control (RBAC)
• Resource Management - API rate limiting
• Business Logic - E-commerce, banking transactions
• Using Storage - Session management with storage
• Best Practices - Guidelines and recommendations

Quick Example

Here's a quick example to get you started:

import { z } from 'zod';
import {
  defineContext,
  defineRule,
  definePolicy,
  evaluatePolicy,
  allow,
  deny,
} from '@bantai-dev/core';

// Define context
const context = defineContext(
  z.object({
    userId: z.string(),
    age: z.number(),
  })
);

// Define rule
const ageRule = defineRule(context, 'age-check', async (input) => {
  if (input.age >= 18) {
    return allow({ reason: 'User is of legal age' });
  }
  return deny({ reason: 'User must be 18 or older' });
});

// Define policy
const policy = definePolicy(context, 'access-policy', [ageRule], {
  defaultStrategy: 'preemptive',
});

// Evaluate
const result = await evaluatePolicy(policy, { userId: 'user123', age: 25 });

More Examples

For more comprehensive examples, check out the examples directory in the repository, which includes:

• Age eligibility with country-specific rules
• Password validation with complexity checks
• Name validation with format checks
• Rate limiting with different strategies
• RBAC with role hierarchies
• AI token quota management
• E-commerce order processing
• Banking transaction validation
• Crypto/NFT policies
• Infrastructure deployment policies

Next Steps

• API Reference - Complete API documentation
• Extensions - Learn about extensions
• Concepts - Deep dive into core concepts