Claude Code Installation and Usage Tutorial

Claude Code is a powerful AI programming assistant that allows you to collaborate with AI directly in the terminal for programming. This tutorial will guide you through the installation and configuration process.

📋 System Requirements

Node.js version ≥ 18.0

Supported operating systems: macOS, Linux, Windows (WSL)

🚀 Quick Start

1. Install Node.js

💡 Tip: If you already have Node.js 18.0 or higher installed, you can skip this step.

Ubuntu / Debian Users

macOS Users

2. Install Claude Code

Install Claude Code globally using npm:

3. Configure and Start Using

Obtain Necessary Configuration Information

You need to prepare two important configuration items:

Configuration Item	Description	How to Obtain
ANTHROPIC_AUTH_TOKEN	API authentication token	After registration, click `Add Token` on the `API Token` page (starts with `sk-`)
ANTHROPIC_BASE_URL	API service address	Use `https://api.key4u.shop` (same as the main site address)

📝 Recommended Settings When Creating a Token:
Name: Name it as you prefer
Quota: Set to unlimited quota
Group: Select Claude code exclusive or official Claude 3 and above
Other options: Keep default settings

Launch Claude Code

Run the following in your project directory:

Initial Run Configuration

After launching, you will see the following configuration steps:

Select Theme → Choose your preferred theme + Press Enter

Security Notice → Confirm the security notice + Press Enter

Terminal Configuration → Use default configuration + Press Enter

Working Directory Trust → Trust the current directory + Press Enter

✨ Congratulations! Now you can start writing code with your AI programming partner!

❓ Frequently Asked Questions

A: This indicates that Claude Code did not detect the environment variables. Please check:

Whether ANTHROPIC_AUTH_TOKEN and ANTHROPIC_BASE_URL are correctly set

Whether the environment variable values are correct (token starts with sk-)

Whether the terminal was restarted if permanent configuration was used

Q: Why does it show "offline" status?

A: Claude Code determines network status by connecting to Google. Displaying "offline" does not affect normal usage; it only indicates that Google cannot be reached.

Q: Why does web browsing Fetch fail?

A: Claude Code needs to call the Claude service for security checks before accessing web pages. You need to:

Maintain a stable international internet connection

Use a global proxy if necessary

Q: Requests always show "fetch failed"?

A: This may be caused by network environment issues. Solutions:

Try using a proxy tool

Q: How to handle API errors?

A: This may be caused by unstable forwarding proxies. It is recommended to:

Exit Claude Code (Ctrl+C)

Run the claude command again

If the problem persists, try again later

A: Try clearing cookies from this site and then log in again.

📌 Important Notes

This site directly connects to the official Claude Code forwarding service

Only supports Claude Code API traffic; other API calls are not supported

Please keep your API token safe and avoid leaking it

Claude Code Official Documentation

Node.js Official Website

💡 Tip: If you encounter other issues, please refer to the official documentation or contact technical support.

Claude Code Installation and Usage Tutorial

Claude Code Installation and Usage Tutorial#

📋 System Requirements#

🚀 Quick Start#

1. Install Node.js#

Ubuntu / Debian Users#

macOS Users#

2. Install Claude Code#

3. Configure and Start Using#

Obtain Necessary Configuration Information#

Launch Claude Code#

Initial Run Configuration#

❓ Frequently Asked Questions#

Q: Encountering "Invalid API Key · Please run /login" error?#

Q: Why does it show "offline" status?#

Q: Why does web browsing Fetch fail?#

Q: Requests always show "fetch failed"?#

Q: How to handle API errors?#

Q: Web login error?#

📌 Important Notes#

🔗 Related Links#

Claude Code Installation and Usage Tutorial

📋 System Requirements

🚀 Quick Start

1. Install Node.js

Ubuntu / Debian Users

macOS Users

2. Install Claude Code

3. Configure and Start Using

Obtain Necessary Configuration Information

Launch Claude Code

Initial Run Configuration

❓ Frequently Asked Questions

Q: Encountering "Invalid API Key · Please run /login" error?

Q: Why does it show "offline" status?

Q: Why does web browsing Fetch fail?

Q: Requests always show "fetch failed"?

Q: How to handle API errors?

Q: Web login error?

📌 Important Notes

🔗 Related Links