I Built the Same Streaming App in Python, Java & .NET — Using Claude API
I built the exact same Claude API streaming app in Python, Java
and .NET — and the difference in how each language handles
real-time responses will surprise you.
This hands-on tutorial shows you how to authenticate with the
Anthropic API, open a live streaming connection, and display
Claude's response token-by-token — built from scratch in all
three tech stacks, side by side.
📂 SOURCE CODE
Full working code for all three implementations is available here: https://github.com/PRPTraining/claude...
⭐ Star the repo if it helped you — it keeps the series going.
In this hands-on tutorial, you'll see how to authenticate with the Anthropic API key, open a real-time streaming connection, and display Claude's response token-by-token as it's generated — all from scratch, in three different tech stacks.
Whether you're a .NET developer, a Java engineer, or a Python developer exploring AI integration, this video gives you a working, production-style implementation you can drop straight into your own projects.
Introduction & Setup
[00:00] - Introduction to the Claude API Streaming App
[01:12] - Prerequisites & Getting the Anthropic API Key
Python Implementation
[01:50] - Project Setup using UV
[03:19] - Building the Claude Streamer Function
[07:02] - Building the Main Control Loop
[09:39] - Running and testing the Python app
Java Implementation
[10:30] - Maven Setup & API Configuration
[12:48] - Building the Streaming Function
[15:12] - Building the Main Method
[15:44] - Running and testing the Java app
.NET (C#) Implementation
[16:16] - Console Setup & Configuration
[18:04] - Building the Streaming Function
[20:44] - Building the Main Method
[22:38] - Running and testing the .NET app
Wrap Up
[22:59] - Language Comparison and Final Thoughts
🔧 WHAT YOU'LL LEARN
How to set up the Anthropic Claude API in .NET, Java, and Python
How to implement real-time streaming responses in each language
How to securely manage your Anthropic API key using environment variables
Language-specific streaming patterns: Python generators, Java event streams, and C# async/await
Error handling best practices for API-based applications
How the same core logic translates across completely different language ecosystems
💻 TECH STACK
Anthropic Claude API (Claude Sonnet)
Python 3.8+ with the Anthropic Python SDK
Java with the Anthropic Java SDK (Maven)
.NET 10 / C# with Anthropic.SDK (NuGet)
🔑 GET YOUR API KEY
Sign up for an Anthropic API key here: https://console.anthropic.com
📚 USEFUL LINKS
Anthropic API Docs: https://docs.claude.com
Claude Developer Platform: https://console.anthropic.com
👍 If this tutorial helped you, please like, comment, and subscribe — it really helps the channel grow.
💬 Let me know in the comments which language you're using to build with the Claude API, and what you're building!
🔔 SUBSCRIBE for more tutorials on AI integration, backend development, and cross-language programming.
#ClaudeAPI #DotNet #Java #AnthropicAPI #ClaudeAI #CSharp #Python #APIStreaming #AIIntegration #CodingTutorial #BackendDevelopment #SoftwareDevelopment #Programming #LLMTutorial #ArtificialIntelligence
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