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

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Readme

🧰 DevTools Online MCP

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

Supercharge your AI assistants (Claude Desktop, Cursor, Zed, Windsurf) by empowering them with high-performance, local developer tools. No remote API calls, no cloud dependencies—just raw computational power exposed directly to your local AI.

✨ Why this MCP?

Over 120+ specialized frontend engineering utilities from devtoolsonline.dev are currently being ported to be completely native to your AI. With a single configuration line, your Agent learns exactly how to fix broken JSON, decode JWTs, generate strong passwords, parse epochs, and more perfectly on the first try.

🛠️ Available Tools

Tool	Description	Need to know
`json_repair`	Smart auto-fixing for heavily broken JSON syntax	Handles trailing commas, wrong/missing quotes, unescaped chars
`json_format`	Prettify and indent valid JSON securely	Customizable indent levels
`json_validate`	Validate any string as a JSON document	Returns detailed error explanations
`jwt_decode`	Decode JSON Web Tokens	Parses Header/Payload and calculates expiration status
`string_case`	Case Converter (`camel`, `snake`, `kebab`, etc.)	Fully automated refactoring mapping
`unix_timestamp`	Epoch Time Parser	Translate raw ms/sec epochs into human-readable ISO/UTC arrays
`url_encode` / `decode`	Native Percent-Encoding	Escapes complex HTTP strings perfectly
`base64_encode` / `decode`	Binary-to-Text Encoding schemes	Safely encodes blocks of environment data in memory
`password_generate`	Cryptographically Secure Generator	Mix case, numbers, symbols with custom length limits
`uuid_generate`	Generates standard UUIDv4 keys	Uses `node:crypto` / WebCrypto safely
`text_stats`	Analyzer for raw text strings	Generates word, character, empty space metrics, and reading times
`lorem_ipsum`	Generates raw placeholder text	Configurable paragraphs and words
`hex_to_rgb` / `rgb_to_hex`	Conversion for color formatting	Auto-fixes messy CSS `#` color variables

(More tools are actively being ported from our 128+ Web Collection!)

⚙️ Quick Installation (For AI IDEs)

You never have to install this globally. You can bind devtoolsonline-mcp directly to your favorite agent dynamically using npx.

1. Cursor IDE Setup

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

2. Claude Desktop Setup

Modify your configuration file located at:

Windows: %APPDATA%\Claude\claude_desktop_config.json
Mac: ~/Library/Application Support/Claude/claude_desktop_config.json

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

3. VS Code (Cline / Roo Code) Setup

Open your global storage MCP Settings file (~/.vscode/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json):

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

4. Zed Editor Setup

Open configuration (Ctrl + , / Cmd + ,) and set:

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

💡 Prompting Examples

You do not need to call the MCP manually! Once properly configured, simply talk to the AI using Natural Language Prompts:

🐛 Syntax Fixing

"I have a python dictionary that I need in JSON format but it's super broken ({ "key": 'value', }). Use your JSON repair tool to fix it into a rigid schema structure."

🔐 Security & Auth Tokens

"Please decode this JWT token specifically tracking if the payload is expired or not."

⚙️ Time Conversions

"I have an epoch reading 1716334581231. Give me what standard time and date that aligns with."

🎨 Design Conversions

"Convert all the #FF5A2X HEX codes inside this React component into specific RGB object literals."

🤝 Community & Links

Web App: Built with logic powering devtoolsonline.dev.
Core Library NPM: Built on top of @devtoolsonline/core.
Issues/Requests: Please tweet or reach out if you'd like a specific tool ported to MCP.

Made with ❤️ for developers by developers. MIT License.