Installation & Usage Guide for Claude Code

Claude Code is a powerful AI programming assistant that allows you to collaborate with AI directly in the terminal (command-line interface). This guide will help you install and configure this tool.

📋 System Requirements

Node.js version ≥ 18.0

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

🚀 Quick Start

1. Install Node.js

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

Ubuntu / Debian Users

macOS Users

2. Install Claude Code

Use npm to install globally:

3. Configuration & Usage

Required configuration details:

Key	Description	How to obtain
ANTHROPIC_AUTH_TOKEN	API authentication token	Obtain from the `API Token` page after registering (starts with `sk-`)
ANTHROPIC_BASE_URL	API service address	Use `https://api.key4u.shop`

📝 Token creation tips:
Name: any name you prefer
Quota: select unlimited
Group: select az pure or switch from the main version to Claude 3
Keep other fields as default

Launch Claude Code

On Linux/macOS:

On Windows (PowerShell):

cd your-project-folder
$env:ANTHROPIC_BASE_URL = "https://api.key4u.shop"
$env:ANTHROPIC_AUTH_TOKEN = "sk-..."
$env:API_TIMEOUT_MS = "300000"
claude

Initial Setup

When launching, you will see the following setup steps:

Choose Theme → select your preferred theme + press Enter

Security Notice → confirm + Enter

Terminal Configuration → select default + Enter

Trust Working Directory → select "trust" + Enter

✨ Congratulations! You are now ready to collaborate on programming with AI!

❓ FAQ

A: Environment variables have not been set. Please check:

Have ANTHROPIC_AUTH_TOKEN and ANTHROPIC_BASE_URL been set?

Does the token start with sk- in the correct format?

Have you restarted the terminal after setting them?

Q: Status shows "offline"?

A: The tool checks Google connectivity to assess the network. Even if it shows "offline", you can still use it normally.

Q: Web page fetch fails?

A: Claude Code requires a security check before accessing the web. Solutions:

Ensure a stable international internet connection

Use a proxy or VPN if needed

Q: Fetch always fails?

A: May be a network issue. Try:

Use a proxy tool (VPN, Shadowsocks, etc.)

Q: API call error?

A: Usually caused by an unstable proxy. Solutions:

Exit Claude Code (Ctrl + C)

Restart with the claude command

If the error persists, try again later

A: Please clear cookies on the page and log in again.

📌 Notes

This service connects directly to the official Claude Code API

Only supports traffic from Claude Code — cannot be used for other APIs

Keep your API token secure — do not share it publicly

🔗 Resources

Official Claude Code Documentation

Node.js Homepage

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

Guide to installing and using Claude Code

Installation & Usage Guide for Claude Code#

📋 System Requirements#

🚀 Quick Start#

1. Install Node.js#

Ubuntu / Debian Users#

macOS Users#

2. Install Claude Code#

3. Configuration & Usage#

Required configuration details:#

Launch Claude Code#

On Linux/macOS:#

On Windows (PowerShell):#

Initial Setup#

❓ FAQ#

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

Q: Status shows "offline"?#

Q: Web page fetch fails?#

Q: Fetch always fails?#

Q: API call error?#

Q: Browser login error?#

📌 Notes#

🔗 Resources#