Package Exports

devtoolsonline-mcp
devtoolsonline-mcp/dist/index.js

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Readme

devtoolsonline-mcp 🧰

The official Model Context Protocol (MCP) server for DevTools Online.

Supercharge your AI assistants (Claude Desktop, Cursor, Windsurf) by empowering them with high-performance, local developer tools. No APIs, no cloud dependencies—just raw power.

🚀 Available Tools

Currently exposes the core engine of DevTools Online:

json_repair: Smart auto-fixing for severely broken JSON syntax (handles missing commas, wrong quotes, trailing commas, non-standard Python output, etc.).
json_format: Prettify and indent valid JSON.
json_validate: Confirm whether a string is a valid JSON document.
jwt_decode: Decode JWT Header and Payload, with built-in expiration checks.
string_case: Convert text between camelCase, snake_case, PascalCase, kebab-case, SCREAMING_SNAKE, and more.
url_encode / url_decode: Handle complex percent-encoded strings securely in environments.
base64_encode / base64_decode: Convert between text and base64 flawlessly.
password_generate: Create highly secure, customizable passwords.
uuid_generate: Quickly generate secure UUIDv4 tokens.

More tools from our 128+ web collection are being ported batch-by-batch!

🤖 Configuration for AI IDEs

You can connect this package directly to your favorite AI agent without installing it globally using npx:

1. Cursor IDE

Open Cursor Settings (Ctrl + Shift + J or Cmd + Shift + J).
Go to Features -> MCP Servers.
Click + Add new MCP server.
Set name: DevToolsOnline
Set Type: command
Set Command: npx -y devtoolsonline-mcp

2. Claude Desktop

Add the following to your claude_desktop_config.json (usually located at %APPDATA%\Claude\claude_desktop_config.json on Windows or ~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "devtoolsonline": {
      "command": "npx",
      "args": ["-y", "devtoolsonline-mcp"]
    }
  }
}

3. Windsurf

Edit your ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "devtoolsonline": {
      "command": "npx",
      "args": ["-y", "devtoolsonline-mcp"]
    }
  }
### 4. Cline & Roo Code (VS Code Extensions)
Open your MCP settings file (typically `~/.vscode/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json` or equivalent for Roo):
```json
{
  "mcpServers": {
    "devtoolsonline": {
      "command": "npx",
      "args": ["-y", "devtoolsonline-mcp"]
    }
  }
}

5. Zed Editor

Open your Zed settings (Ctrl + , or Cmd + ,), then configure the MCP server block:

{
  "mcpServers": {
    "devtoolsonline": {
      "command": "npx",
      "args": ["-y", "devtoolsonline-mcp"]
    }
  }
}

💡 Usage Examples

Once configured, your AI will automatically know how to use these tools. You can prompt your AI with natural language like:

Example 1 (Repairing JSON):

"I have this broken JSON from a Python log. Please use your JSON repair tool to fix it: { name: 'John', is_active: True, }"

Example 2 (Decoding JWT):

"Decode this JWT token and tell me when it expires: eyJhbGci..."

Example 3 (String Conversion):

"Please convert a list of these environment variables from SCREAMING_SNAKE to camelCase."

🌐 Links

Web Version: devtoolsonline.dev
Core Library: Powered by @devtoolsonline/core