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