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Unit Converter Library

Welcome to the Unit Converter Library!
This library helps developers perform unit conversions for a wide range of categories such as distance, weight, temperature, area, volume, pressure, data, power, fuel economy, and more. It even includes advanced scientific conversions for specialized applications.

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Installation

Install the library via npm:

npm install unit-convertor-js

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Usage

First, import the library into your project:

const { convert } = require('unit-convertor-js');

Then, start converting!

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Supported Categories

Distance

• Units: meters, kilometers, miles, yards, feet, inches

Weight

• Units: grams, kilograms, pounds, ounces, tons

Temperature

• Units: celsius, fahrenheit, kelvin

Area

• Units: squareMeters, squareKilometers, hectares, acres

Volume

• Units: liters, milliliters, cubicMeters, gallons

Pressure

• Units: pascal, bar, psi

Data

• Units: bytes, kilobytes, megabytes, gigabytes, terabytes

Power

• Units: watts, kilowatts, horsepower

Fuel Economy

• Units: kilometersPerLiter, milesPerGallon

Advanced

• Examples: liters square meters, kilograms liters, and more

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Examples

Basic Conversion

Perform a simple conversion between two units of the same category:

// Convert 100 meters to kilometers
console.log(convert(100, "meters", "kilometers")); 
// Output: 0.1

// Convert 50 grams to pounds
console.log(convert(50, "grams", "pounds")); 
// Output: 0.110231

Temperature Conversion

Convert between Celsius, Fahrenheit, and Kelvin:

// Convert 25 Celsius to Fahrenheit
console.log(convert(25, "celsius", "fahrenheit")); 
// Output: 77

// Convert 300 Kelvin to Celsius
console.log(convert(300, "kelvin", "celsius")); 
// Output: 26.85

Advanced Conversion

Use additional parameters for specialized calculations:

Liters to Square Meters

Specify the thickness in meters for accurate area calculation.

console.log(convert(20, "liters", "squareMeters", { thickness: 0.05 })); 
// Output: 400

Weight to Volume

Specify the density (kg/L):

console.log(convert(10, "kilograms", "liters", { density: 0.8 })); 
// Output: 12.5

Fuel Economy

Convert between kilometers per liter and miles per gallon:

console.log(convert(5, "kilometersPerLiter", "milesPerGallon")); 
// Output: 11.76

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Error Handling

The library provides clear error messages for invalid conversions:

try {
  console.log(convert(100, "grams", "meters")); // Invalid conversion
} catch (error) {
  console.error(error.message); 
  // Output: Conversion from "grams" to "meters" is not supported.
}

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Testing the Library

1. Install Jest for Testing

Use Jest for easy testing:

npm install jest --save-dev

2. Create a Test File

Create a file called unitConverter.test.js:

const { convert } = require('./unitConverter');

// Test basic conversions
test("Convert meters to kilometers", () => {
  expect(convert(1000, "meters", "kilometers")).toBe(1);
});

test("Convert grams to pounds", () => {
  expect(convert(1000, "grams", "pounds")).toBeCloseTo(2.20462);
});

// Test temperature conversions
test("Convert Celsius to Fahrenheit", () => {
  expect(convert(0, "celsius", "fahrenheit")).toBe(32);
});

test("Convert Kelvin to Celsius", () => {
  expect(convert(300, "kelvin", "celsius")).toBeCloseTo(26.85);
});

// Test advanced conversions
test("Convert liters to square meters (thickness)", () => {
  expect(convert(20, "liters", "squareMeters", { thickness: 0.05 })).toBe(400);
});

test("Convert kilograms to liters (density)", () => {
  expect(convert(10, "kilograms", "liters", { density: 0.8 })).toBe(12.5);
});

// Test invalid conversions
test("Invalid conversion", () => {
  expect(() => convert(100, "grams", "meters")).toThrow();
});

3. Run the Tests

Run the tests using:

npx jest unitConverter.test.js

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Future Features (Coming Soon)

• Currency Converter: Convert between currencies using real-time exchange rates.
• Astronomical Units: Light years, parsecs, and more.
• Speed: Kilometers per hour Miles per hour Meters per second.

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Feedback and Contributions

We love contributions! Feel free to fork the repository, suggest features, or submit issues.