Devutils

npm version npm downloads License: MIT

MCP server with 45 developer utilities for Claude Desktop, Cursor, Windsurf, and any MCP-compatible AI assistant.

3,900+ developers have installed mcp-devutils — join them in seconds.

16 tools free forever + try all 29 pro tools 3 times each — unlock permanently for $5 (one-time).

"Generate a UUID" · "Hash this password with SHA-256" · "Decode this JWT" · "What does 0 15 10 * * ? mean in cron?" · "Convert this JSON to CSV" · "Diff these two configs"

Just ask your AI assistant — mcp-devutils handles it instantly, no browser tabs needed.

Install

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

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

Cursor

Add to .cursor/mcp.json in your project or ~/.cursor/mcp.json globally:

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

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

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

Claude Code

claude mcp add devutils -- npx -y mcp-devutils

VS Code (Copilot / Continue / Cline)

Add to .vscode/mcp.json in your project:

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

---

🔓 Try before you buy — Every pro tool works 3 times free, no sign-up needed. Just install and ask your AI assistant to use any pro tool. Love it? Unlock all 29 pro tools permanently for $5 (one-time, no subscription).

Unlock all 45 tools for $5 →

---

Unlock Pro (29 extra tools) — $5 one-time

1. Buy Pro License ($5)
2. Your license key is emailed within 1 hour
3. Add it to your MCP config:

{
  "mcpServers": {
    "devutils": {
      "command": "npx",
      "args": ["-y", "mcp-devutils"],
      "env": {
        "MCP_DEVUTILS_KEY": "DU.xxxxx.xxxxx"
      }
    }
  }
}

Free Tools (16)

Tool	Description
uuid	Generate UUID v4 (batch support)
hash	Hash text (md5, sha1, sha256)
base64	Encode/decode base64
timestamp	Convert Unix ↔ ISO 8601 dates
jwt_decode	Decode JWT tokens (header + payload)
random_string	Generate random strings/passwords
url_encode	URL encode/decode
json_format	Pretty-print or minify JSON
yaml_json	Convert between YAML and JSON (auto-detects format)
regex_test	Test regex patterns with match details
cron_explain	Explain cron expressions + next run times
hmac	Generate HMAC signatures
color_convert	Convert hex ↔ RGB ↔ HSL colors
http_status	Look up HTTP status code meanings
slug	Generate URL-safe slugs
escape_html	Escape/unescape HTML entities
devutils_status	Show license status and remaining trial uses

Pro Tools (29)

Tool	Description
semver_compare	Compare semantic versions
chmod_calc	Convert numeric ↔ symbolic permissions
diff	Compare two text strings
number_base	Convert decimal/hex/octal/binary
lorem_ipsum	Generate placeholder text
word_count	Count chars, words, lines, bytes
cidr	Parse CIDR notation (network, broadcast, hosts)
case_convert	Convert camelCase/snake_case/PascalCase/kebab-case
markdown_toc	Generate table of contents from markdown
env_parse	Parse and validate .env files
ip_info	Analyze IP addresses (type, class, private/public)
password_strength	Analyze password entropy and strength
data_size	Convert between bytes/KB/MB/GB/TB (SI + IEC)
string_escape	Escape strings for JSON/CSV/regex/SQL/shell
nanoid	Generate compact, URL-safe unique IDs
csv_json	Convert between CSV and JSON
hex_encode	Hex encode/decode text
char_info	Unicode character info (codepoint, UTF-8 bytes, HTML entity)
byte_count	Count string bytes in UTF-8/UTF-16/ASCII
json_diff	Compare two JSON objects — show added/removed/changed
jwt_create	Create HS256 JWT tokens for API testing
sql_format	Format SQL queries with proper indentation
json_query	Extract values from JSON using dot-notation paths
epoch_convert	Convert epoch timestamps across multiple timezones
aes_encrypt	AES-256-CBC encrypt text with any key
aes_decrypt	Decrypt AES-256-CBC encrypted text
rsa_keygen	Generate RSA key pairs (1024/2048/4096-bit)
scrypt_hash	Hash passwords with scrypt (RFC 7914)
regex_replace	Find & replace with regex + capture groups

Also available as a VS Code extension

Prefer tools in your editor sidebar? DevUtils for VS Code — same 45 tools, native VS Code UI. Works on selected text, activity bar panel, keyboard shortcuts.

Minimal dependencies

Only requires @modelcontextprotocol/sdk and js-yaml. All other tools use Node.js built-ins.

Support

• Get Pro ($5) — unlock all 45 tools
• Buy Me a Coffee

License

MIT