MCP Server DevUtils — 17 Developer Tools for AI Assistants

An MCP server that gives your AI assistant 17 developer utilities — 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.

MCP server devutils demo — JWT decode, UUID generation, and cron explanation in Claude Desktop

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

Author

Ofer Shapira

mcp-server-devutils

Quick Install