devtools-mcp

Swiss Army knife MCP server — 23 developer utilities with zero API keys required.

Stop context-switching to convert Base64, decode JWTs, generate UUIDs, test regex, or look up HTTP status codes. mcp-devtools-server puts all these tools directly in your AI assistant.

[](https://www.npmjs.com/package/mcp-devtools-server) [](https://opensource.org/licenses/MIT)

claude mcp add devtools -- npx mcp-devtools-server

Add to your claude_desktop_config.json:

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

Add to .cursor/mcp.json or VS Code MCP settings:

{
  "servers": {
    "devtools": {
      "command": "npx",
      "args": ["devtools-mcp"]
    }
  }
}

No API keys. No configuration. Just works.

| Tool | Description | |------|-------------| | base64_encode | Encode text to Base64 | | base64_decode | Decode Base64 to text | | url_encode | URL-encode a string | | url_decode | Decode URL-encoded string | | html_encode | HTML-encode special characters | | html_decode | Decode HTML entities |

| Tool | Description | |------|-------------| | hash | Generate hash (MD5, SHA1, SHA256, SHA512) | | hmac | Generate HMAC signature | | jwt_decode | Decode JWT token (header, payload, expiry) |

| Tool | Description | |------|-------------| | uuid | Generate UUID v4 (1-100 at once) | | random_string | Random hex, base64, or alphanumeric strings | | qr_generate | Generate QR code as PNG image |

| Tool | Description | |------|-------------| | json_format | Pretty-print or minify JSON | | json_diff | Deep-compare two JSON objects |