Home/ Projects/ Backend/Currency Converter API CLI client

Step-by-step guideEasyBackend Estimated: Under 2 Hours Est. 4h total

Progress:

Currency Converter API CLI client

Java HTTP client querying exchange rates APIs and outputting balances.

Tech Stack:JavaHttpClientGson

Roadmap Steps

Key Features

Concepts

Tech Stacks

Common Pitfalls

Prequisites

Interactive Project Checklist

Tick off requirements as you build to track real-time completion.

Completed

Step-by-Step Development Roadmap

Follow this chronological guide to build the project from scratch.

0 / 1 Steps Completed

Step 1

HTTP Client Request

3 key tasks

Query exchange rates using HttpClient.

Key Implementation Tasks

Set up connection options
Implement request helper functions
Verify output JSON content

Converter.java

import java.net.URI;
import java.net.http.*;
import java.io.IOException;

public class Converter {
    public static String getExchangeRates(String apiKey) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://v6.exchangerate-api.com/v6/" + apiKey + "/latest/USD"))
            .GET()
            .build();
            
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        return response.body();
    }
}

Common Challenges & Debugging Solutions

Real issues students hit during development and how to troubleshoot them fast.

State Management

API Key Exposure

Issue: Committing raw API key details inside repositories.

Fix Solution:Enforce reading key values from local environment variables System.getenv.

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Home/ Projects/ Backend/Currency Converter API CLI client

Step-by-step guideEasyBackend Estimated: Under 2 Hours Est. 4h total

Progress:

Currency Converter API CLI client

Java HTTP client querying exchange rates APIs and outputting balances.

Tech Stack:JavaHttpClientGson

Roadmap Steps

Key Features

Concepts

Tech Stacks

Common Pitfalls

Prequisites

Interactive Project Checklist

Tick off requirements as you build to track real-time completion.

Completed

Step-by-Step Development Roadmap

Follow this chronological guide to build the project from scratch.

0 / 1 Steps Completed

Step 1

HTTP Client Request

3 key tasks

Query exchange rates using HttpClient.

Key Implementation Tasks

Set up connection options
Implement request helper functions
Verify output JSON content

Converter.java

import java.net.URI;
import java.net.http.*;
import java.io.IOException;

public class Converter {
    public static String getExchangeRates(String apiKey) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://v6.exchangerate-api.com/v6/" + apiKey + "/latest/USD"))
            .GET()
            .build();
            
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        return response.body();
    }
}