Prevent Leaks in Claude Code with .claudeignore
This article explains how to use the .claudeignore file to exclude sensitive and irrelevant files from the Claude Code context, improving security and performance.
Why it matters
Properly configuring the .claudeignore file is a crucial step to ensure the security and performance of Claude Code in real-world projects.
Key Points
- 1Claude Code can access everything in the project directory by default, including node_modules, .env files, and build artifacts
- 2The .claudeignore file uses the same syntax as .gitignore to specify files and folders to exclude from the context
- 3Ignoring .env and other credential files is crucial to prevent sensitive information from leaking
- 4Excluding large files like node_modules improves performance by allowing Claude to focus on the actual code
Details
The article discusses how Claude Code's default behavior of reading everything in the project directory can lead to security risks and performance issues. By using a .claudeignore file, developers can exclude sensitive files like .env, as well as large directories like node_modules, to create a clean workspace for Claude. This improves security by preventing credential leaks and enhances performance by allowing Claude to focus on the relevant code. The article provides example .claudeignore configurations for a typical Node.js project, covering dependencies, build output, environment files, and other artifacts. It also explains how the .claudeignore file works in conjunction with the CLAUDE.md file to define the project's conventions and workspace settings.
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