README.md
17 developer utilities for AI assistants
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.
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 * * 1-5mean?" - "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
README built with README Builder
License
Tools (17)
base64_encodeEncode a string to Base64base64_decodeDecode a Base64 stringuuid_generateGenerate one or more UUIDs (v4)ulid_generateGenerate a ULIDhashHash a string (md5, sha1, sha256, sha384, sha512)hash_allHash with all algorithms at oncejwt_decodeDecode a JWT token (header, payload, expiry)cron_explainExplain a cron expression in plain Englishcron_validateValidate a cron expressioncron_nextShow next N run times for a cron expressiontimestamp_to_isoConvert Unix timestamp to ISO 8601iso_to_timestampConvert ISO 8601 to Unix timestamptimestamp_nowGet current time in multiple formatsjson_formatPretty-print a JSON stringjson_minifyMinify a JSON stringjson_validateValidate JSON and report its typeregex_testTest a regex pattern against a stringConfiguration
claude_desktop_config.json
{"mcpServers": {"devutils": {"command": "npx", "args": ["-y", "mcp-server-devutils"]}}}Try it
→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
→Format this JSON: {"a":1,"b":2}