Blog

• Build a RAG App with LangChain and TypeScript

  October 18, 2026

  Build a company handbook AI assistant with LangChain.js, TypeScript, and OpenAI. Learn document loading, chunking, embeddings, vector stores, and retrieval.

• GitHub Actions for Beginners: Create Your First Workflow

  October 17, 2026

  Create your first GitHub Actions workflow step by step. Learn push triggers, jobs, Ubuntu runners, YAML steps, and how to read successful and failed runs.

• How to Unit Test a NestJS Service with Jest

  September 11, 2026

  A complete walkthrough of unit testing a NestJS service with Jest: describe/it/beforeEach, the TestingModule, mocking a repository, and reading a coverage report.

• NestJS Integration Testing: Controller, Service, and Repository Together

  September 11, 2026

  How integration testing differs from mocked unit tests in NestJS: wiring a controller, service, and a real repository through the TestingModule, with no mocks at all.

• How to Unit Test a NestJS Controller with Jest

  September 11, 2026

  Unit testing a NestJS controller with Jest: mocking a service dependency through the TestingModule, testing route handlers, and testing errors the service throws.