Devutils

io.github.ofershapPublished by GitHub account ofershapv1.0.2Updated Oct 28, 2026

Developer utilities MCP: base64, UUID, hash, JWT decode, cron, timestamps.

VerifiedSTDIODesktop onlyDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

Local MCP server giving an assistant 17 offline developer utilities: Base64, UUID/ULID, hashing, JWT decoding, cron, timestamps, JSON and regex.

What you can do
  • Encode and decode Base64 strings
  • Generate UUID v4 and ULID identifiers
  • Hash strings with md5, sha1, sha256, sha384 or sha512, individually or all at once
  • Decode JWT headers and payloads and check expiry
  • Explain, validate and list next run times for cron expressions
  • Convert between Unix timestamps and ISO 8601, and get the current time
When to use it
Useful when you regularly ask an assistant to decode tokens, generate IDs, compute hashes, sanity-check cron schedules, convert timestamps or format JSON, and you want those answers computed locally instead of guessed.
Requirements
Runs as a local stdio process started with npx from the npm package mcp-server-devutils, so Node.js and network access for the first package fetch are needed. No API keys or environment variables are declared.
Before you install
JWT decoding only reads the token contents and does not verify signatures, so decoded claims should not be treated as trusted. Values you paste in, such as tokens or secrets, are passed to the local tool; nothing is sent to external services according to the README.

Installation

In SourceWeft

  1. Open Devutils in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

MCP Server DevUtils — 17 Developer Tools for AI Assistants

[npm version] [npm downloads] [CI] [License: MIT]

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

ToolWhat it does
base64_encodeEncode a string to Base64
base64_decodeDecode a Base64 string
uuid_generateGenerate one or more UUIDs (v4)
ulid_generateGenerate a ULID
hashHash a string (md5, sha1, sha256, sha384, sha512)
hash_allHash with all algorithms at once
jwt_decodeDecode a JWT token (header, payload, expiry)
cron_explainExplain a cron expression in plain English
cron_validateValidate a cron expression
cron_nextShow next N run times for a cron expression
timestamp_to_isoConvert Unix timestamp to ISO 8601
iso_to_timestampConvert ISO 8601 to Unix timestamp
timestamp_nowGet current time in multiple formats
json_formatPretty-print a JSON string
json_minifyMinify a JSON string
json_validateValidate JSON and report its type
regex_testTest a regex pattern against a string

Quick Start

With Claude Desktop

Add to your claude_desktop_config.json:

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

With Cursor

Add to your .cursor/mcp.json:

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

With VS Code (Copilot)

Add to your .vscode/mcp.json:

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

bash
npm installnpm testnpm run build

Author

[Made by ofershap]

[LinkedIn] [GitHub]

README built with README Builder

License

MIT © Ofer Shapira

Source: README.md at commit 3f8f615

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.2LatestSep 16, 2026

Score

50% of the applicable checks met

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  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

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  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts