API Testing with Bruno: Writing and Validating Test Scripts

API testing is a crucial part of modern software development, ensuring that your backend services function as expected. Bruno, a robust and intuitive API client, is designed to simplify this process with powerful test scripting capabilities. Whether you’re new to API testing or transitioning from tools like Postman, this guide will help you master test script writing in Bruno.

What is Bruno API Client?

Bruno is an open-source API development and testing tool that offers a modern and streamlined approach to managing API requests. It supports JavaScript for writing test scripts, making it a familiar environment for developers. Additionally, Bruno is designed to integrate seamlessly into CI/CD pipelines, empowering teams to automate API testing effectively.

Setting Up Bruno for Testing

1. Install Bruno CLI: Install Bruno’s CLI for command-line testing:

npm install @usebruno/cli

1. Create a Test Project: Set up a new project folder and initialize it as an npm project:

mkdir bruno-tests
cd bruno-tests
npm init -y

1. Add API Request Sets: Add your API requests into .bru files, grouped into sets for organization.
2. Set Up Environment Variables: Define variables such as API hosts or authentication tokens for dynamic configuration.

Writing Test Scripts in Bruno