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, minify code, convert CSV to JSON, parse epochs, and more — perfectly on the first try.

🛠️ Available Tools

42 tools available across 7 categories:

| Tool Category | Available Methods | Description | | :--- | :--- | :--- | | Networking & Web | url_parse, url_encode, url_decode, dns_lookup, cidr_calculator | Parse URLs, encode/decode, fetch DNS records, calculate CIDR subnet ranges. | | Data Formats | json_repair, json_format, json_validate, json_diff, csv_to_json, json_to_csv, env_to_json, json_to_env | Fix broken JSON, prettify, validate, diff objects, and convert between CSV/JSON/ENV. | | Encoding / Crypto | base64_encode, base64_decode, jwt_decode, hash_generate, number_base_convert, string_escape, string_unescape | Encode strings, parse JWTs securely, generate hashes (MD5/SHA), convert bases, escape literals. | | Generators | uuid_generate, password_generate, slug_generate, nanoid_generate, random_string, robots_txt_generate | Generate UUIDs, secure passwords, URL slugs, NanoIDs, random strings, and robots.txt files. | | Code Minifiers | minify_html, minify_css, minify_json, minify_xml | Strip whitespace and comments from HTML, CSS, JSON, and XML for production-ready output. | | String & Text | string_case, text_stats, text_sort_lines, lorem_ipsum, html_to_markdown | Convert casing (camelCase, snake_case...), analyze text stats, sort lines, generate placeholders. | | Misc / Conversions | html_encode, html_decode, byte_convert, hex_to_rgb, rgb_to_hex, unix_timestamp | Escape HTML entities, convert byte sizes, switch between color formats, parse timestamps. |

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

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"]
    }
  }
}

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"]
    }
  }
}

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.