BRX Development Guide

This guide provides best practices and tips for developing applications with BRX. Whether you’re building a simple prototype or a complex production application, these guidelines will help you make the most of the BRX platform.

Development Environment Setup

Prerequisites

Node.js 14+ (for using the Node.js SDK)
A code editor (VS Code, WebStorm, etc.)
A BRX account with API access

Local Development

For local development, you can use the BRX SDK with your development API key:

import BRX from 'brx-node';

// Use your development API key
const brx = new BRX('your-dev-api-key');

If you’re running a local instance of the BRX API (for internal development), you can configure the SDK to use it:

const brx = new BRX('your-api-key', {
  send_local: true // Use local API endpoint
});

BRK Design Principles

Modularity

Design your BRKs to be modular and reusable. Each BRK should have a single responsibility and do it well. ✅ Good: Separate BRKs for data extraction, analysis, and report generation ❌ Bad: A single BRK that does everything

Input Validation

Always validate inputs to your BRKs to ensure they meet the expected format and constraints.

// Before executing a BRK, validate its inputs
if (!myBrk.input['data'] || typeof myBrk.input['data'] !== 'string') {
  throw new Error('Data input must be a non-empty string');
}

Error Handling

Implement robust error handling in your applications to gracefully handle failures.

try {
  const result = await brx.run(myBrk);
  // Process the result
} catch (error) {
  // Log the error
  console.error('Error executing BRK:', error);
  
  // Provide a user-friendly error message
  if (error.message.includes('rate limit')) {
    console.error('Rate limit exceeded. Please try again later.');
  } else {
    console.error('An error occurred. Please try again or contact support.');
  }
}

Dependency Management

When creating BRKs with dependencies, be mindful of the dependency graph to avoid circular dependencies and excessive nesting. ✅ Good: A clear, directed acyclic graph of dependencies ❌ Bad: Circular dependencies or deeply nested dependencies

Performance Optimization

Minimize Token Usage

LLM-based operations consume tokens, which can impact performance and cost. Optimize your prompts to minimize token usage:

Be concise and specific in your prompts
Use shorter examples where possible
Remove unnecessary context or instructions

Caching

Implement caching for BRK results that don’t change frequently:

const cache = new Map();

async function getCachedResult(brkId, inputs) {
  const cacheKey = `${brkId}:${JSON.stringify(inputs)}`;
  
  if (cache.has(cacheKey)) {
    return cache.get(cacheKey);
  }
  
  const brkSchema = await brx.get(brkId);
  const myBrk = new BRK(brkSchema);
  
  // Set inputs
  Object.entries(inputs).forEach(([key, value]) => {
    myBrk.input[key] = value;
  });
  
  const result = await brx.run(myBrk);
  
  // Cache the result
  cache.set(cacheKey, result);
  
  return result;
}

Parallel Execution

For independent BRKs, you can execute them in parallel to improve performance:

// Execute multiple BRKs in parallel
const [result1, result2, result3] = await Promise.all([
  brx.run(brk1),
  brx.run(brk2),
  brx.run(brk3)
]);

Testing

Unit Testing

Write unit tests for your BRK-related code to ensure it behaves as expected:

// Using Jest for testing
describe('Product Description Generator', () => {
  let brx;
  let productDescriptionBrk;
  
  beforeAll(async () => {
    brx = new BRX('test-api-key');
    const schema = await brx.get('product-description-generator');
    productDescriptionBrk = new BRK(schema);
  });
  
  test('generates a product description', async () => {
    // Set inputs
    productDescriptionBrk.input['product_name'] = 'Test Product';
    productDescriptionBrk.input['product_category'] = 'Test Category';
    productDescriptionBrk.input['key_features'] = 'Feature 1, Feature 2';
    productDescriptionBrk.input['target_audience'] = 'Test Audience';
    
    // Execute the BRK
    const result = await brx.run(productDescriptionBrk);
    
    // Assert on the result
    expect(result).toBeDefined();
    expect(result[0].brxRes.output).toContain('Test Product');
  });
});

Mock Testing

For faster and more reliable tests, you can mock the BRX API responses:

// Mock the BRX client
jest.mock('brx-node', () => {
  return {
    __esModule: true,
    default: jest.fn().mockImplementation(() => ({
      get: jest.fn().mockResolvedValue({
        // Mock schema
      }),
      run: jest.fn().mockResolvedValue([
        {
          brxId: 'test-brk',
          brxName: 'Test BRK',
          brxRes: {
            output: 'Test output'
          }
        }
      ])
    })),
    BRK: jest.fn().mockImplementation(() => ({
      input: {},
      run: jest.fn().mockResolvedValue([
        {
          brxId: 'test-brk',
          brxName: 'Test BRK',
          brxRes: {
            output: 'Test output'
          }
        }
      ])
    }))
  };
});

Deployment

Environment Variables

Store your API keys and other sensitive information in environment variables:

// Load environment variables
require('dotenv').config();

// Use environment variables
const brx = new BRX(process.env.BRX_API_KEY);

CI/CD Integration

Integrate BRX into your CI/CD pipeline to automate testing and deployment:

# Example GitHub Actions workflow
name: BRX CI/CD

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Use Node.js
        uses: actions/setup-node@v2
        with:
          node-version: '14'
      - run: npm ci
      - run: npm test
        env:
          BRX_API_KEY: ${{ secrets.BRX_API_KEY }}
  
  deploy:
    needs: test
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'
    steps:
      - uses: actions/checkout@v2
      - name: Use Node.js
        uses: actions/setup-node@v2
        with:
          node-version: '14'
      - run: npm ci
      - run: npm run build
      - name: Deploy
        run: npm run deploy
        env:
          BRX_API_KEY: ${{ secrets.BRX_API_KEY }}

Production Considerations

When deploying to production, consider the following:

Use a production API key with appropriate permissions
Implement rate limiting and retry logic
Monitor API usage and performance
Set up alerts for errors and failures
Implement proper error handling and fallbacks

Security Best Practices

API Key Management

Never hardcode API keys in your code
Use environment variables or a secure key management service
Rotate API keys regularly
Use different API keys for development and production

Input Sanitization

Sanitize user inputs before passing them to BRKs to prevent prompt injection and other security issues:

function sanitizeInput(input) {
  // Remove potentially harmful characters or patterns
  return input.replace(/[<>]/g, '');
}

// Before setting BRK inputs
myBrk.input['user_input'] = sanitizeInput(userInput);

Access Control

Use BRX’s access control features to restrict access to your BRKs:

// Update BRK access control
const updateAclRequest = {
  brxId: 'your-brk-id',
  isPublic: false,
  isClone: false,
  emails: [
    {
      email: 'user@example.com',
      permission: 1 // Editor
    }
  ]
};

await brx.update_brx_acl(updateAclRequest);

Monitoring and Debugging

Logging

Implement comprehensive logging to help debug issues:

// Enable verbose logging
const brx = new BRX('your-api-key', { verbose: true });

// Log BRK execution
console.log(`Executing BRK: ${myBrk.brxQuery.userSchemaInteract.mainBrxId}`);
const result = await brx.run(myBrk);
console.log(`BRK execution completed: ${result.length} results`);

Monitoring

Monitor your BRX usage and performance:

Track API calls and response times
Monitor token usage
Set up alerts for errors and failures
Analyze usage patterns to identify optimization opportunities

Further Resources

BRX API Reference
[Core Concepts: BRK](/docs/Core Concepts/BRK)
[Core Concepts: BRX Client](/docs/Core Concepts/BRXClient)
[Core Concepts: Composability](/docs/Core Concepts/Composability)
[Core Concepts: Tool Calling](/docs/Core Concepts/ToolCalling)
brx-node SDK Reference

​BRX Development Guide

​Development Environment Setup

​Prerequisites

​Local Development

​BRK Design Principles

​Modularity

​Input Validation

​Error Handling

​Dependency Management

​Performance Optimization

​Minimize Token Usage

​Caching

​Parallel Execution

​Testing

​Unit Testing

​Mock Testing

​Deployment

​Environment Variables

​CI/CD Integration

​Production Considerations

​Security Best Practices

​API Key Management

​Input Sanitization

​Access Control

​Monitoring and Debugging

​Logging

​Monitoring

​Further Resources