Debug node.js with VS Code

Set up VS Code to debug node.js

🚗 1. Add js files

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// main.js
const { add } = require('./calc');

console.log(add(3, 4));
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// calc.js
const add = (num1, num2) => {
  return num1 + num2;
};

module.exports.add = add;

🚗 2. Create a launch.jsonfile

🚗 3. Edit launch.json to set the entry point

In this case, main.js is the entry point.

🚗 4. Set breakpoint and Run

Yay! easy ✨

💰💰💰 Bonus! - test with Jest 💰💰💰

🚙 1. Initialise npm

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npm init -y

🚙 2. Install Jest

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npm install --save-dev jest

🚙 3. Add test sctipt to package.json

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"scripts": {
  "test": "jest --watchAll"
}

🚙 4. Create test file

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//calc.spec.js
const { add } = require('./calc');

describe('calc', () => {
  describe('add', () => {
    it('Should add two numbers', () => {
      // Arrange
      const expected = 7;

      // Act
      const result = add(3, 4);

      // Assert
      expect(result).toBe(expected);
    });
  });
});

🚙 5. Run test

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npm test

Yay! Easy as 🎉🎉🎉