Currency Converter – Java + ExchangeRate API

Console application developed in Java 17 using Maven.
The project consumes the ExchangeRate API to obtain real-time FX rates and converts values between multiple currencies (USD, ARS, BRL, COP).
It is part of my backend training path and replicates a realistic workflow: API integration, JSON processing, domain logic and packaging the app as an executable JAR.

Responsibilities

Design of the conversion flow and menu-driven CLI.

Integration with ExchangeRate API (HTTP client + API key handling).

JSON parsing with Gson and mapping response fields.

Error handling for network issues, invalid input and malformed JSON.

Maven configuration, dependency management and JAR packaging.

Tech Stack

Language: Java 17

Build tool: Maven

HTTP client: java.net.http.HttpClient / HttpRequest / HttpResponse

JSON: Gson (JsonParser, JsonObject)

Config: .properties file for API key

Version control: Git + GitHub

Features

Real-time FX conversion using ExchangeRate API.

Supported pairs:

USD ⇄ ARS

USD ⇄ BRL

USD ⇄ COP

Text-based interactive menu with Scanner.

Clear error messages for invalid options and input values.

API key loaded securely from config.properties (not hard-coded).