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Currency Exchange API

2 min read

Build a Real-Time Currency Converter

Building a currency converter is a classic project for developers. It's a practical way to learn the fundamentals of working with a third-party API: making an HTTP request, parsing a JSON response, and dynamically updating the UI.

This tutorial will walk you through building a clean, functional currency converter web application from scratch. We will use HTML, CSS, and vanilla JavaScript to call a REST API, fetch a live exchange rate, and perform the conversion instantly. We'll be using the Currency Exchange API for its simple endpoint and straightforward JSON response.

Step 1: Get Your API Key

Before you can make a request, you need an API key to authenticate.

  1. Sign up for a free account at hub.juheapi.com.
  2. Navigate to your dashboard to find your API keys.
  3. Generate a new key for this project and copy it.

Step 2: Understanding the API Request and Response

The API is designed for simplicity.

  • The Request: You'll make a GET request with a few key query parameters:

    • key: Your API key.
    • from: The currency you are converting from (e.g., USD).
    • to: The currency you are converting to (e.g., EUR).
    • value: The amount of the base currency to convert.
  • The JSON Response: A successful call returns a JSON object. The most important parts are result (the converted amount) and info.rate. For this guide, we'll focus on the primary result. A successful response might look like this:

    {
        "reason": "Success",
        "result": {
            "c_amount": "100",
            "c_from": "USD",
            "c_to": "EUR",
            "camount": "92.54" // The converted amount
        },
        "error_code": 0
    }
    

Step 3: Building the Application

Conclusion & Next Steps

Ready to expand? Dive into the full API Documentation to see the complete list of supported currencies or explore other powerful Fintech APIs on hub.juheapi.com.