mcp-server-devutils

17 developer utilities as MCP tools — base64, UUID, JWT decode, cron, timestamps, JSON, regex. No API keys, no external services, just npx.

You: "Decode this JWT: eyJhbGci..."
AI:  Header: { alg: "RS256" }  Payload: { sub: "1234", exp: 1700000000 }  Expired: yes

Works with Claude Desktop, Cursor, and VS Code Copilot. Zero auth required.

Tools

Tool	What it does
base64_encode	Encode a string to Base64
base64_decode	Decode a Base64 string
uuid_generate	Generate one or more UUIDs (v4)
ulid_generate	Generate a ULID
hash	Hash a string (md5, sha1, sha256, sha384, sha512)
hash_all	Hash with all algorithms at once
jwt_decode	Decode a JWT token (header, payload, expiry)
cron_explain	Explain a cron expression in plain English
cron_validate	Validate a cron expression
cron_next	Show next N run times for a cron expression
timestamp_to_iso	Convert Unix timestamp to ISO 8601
iso_to_timestamp	Convert ISO 8601 to Unix timestamp
timestamp_now	Get current time in multiple formats
json_format	Pretty-print a JSON string
json_minify	Minify a JSON string
json_validate	Validate JSON and report its type
regex_test	Test a regex pattern against a string

Quick Start

With Claude Desktop

Add to your claude_desktop_config.json:

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

With Cursor

Add to your .cursor/mcp.json:

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

With VS Code (Copilot)

Add to your .vscode/mcp.json:

{
  "servers": {
    "devutils": {
      "command": "npx",
      "args": ["-y", "mcp-server-devutils"]
    }
  }
}

Examples

Ask your AI assistant:

• "Decode this JWT token: eyJhbG..."
• "What does the cron expression 0 9 * * 1-5 mean?"
• "Generate 5 UUIDs"
• "Hash this string with SHA-256: hello world"
• "Convert Unix timestamp 1700000000 to a date"
• "Format this JSON: {"a":1,"b":2}"
• "Test the regex \d{3}-\d{4} against '555-1234'"

Development

npm install
npm test
npm run build

License

MIT © Ofer Shapira