@ezark/devtools-mcp

MCP server providing 25+ developer tools — JSON formatting, encoding, hashing, UUID, JWT decode, and more. All processing runs locally.

Quick Start

With Claude Code

claude mcp add devtools-mcp -- npx devtoolbox-mcp

With Claude Desktop

{
  "mcpServers": {
    "devtools-mcp": {
      "command": "npx",
      "args": ["@ezark/devtools-mcp"]
    }
  }
}

Available Tools (25)

JSON Tools

Tool	Description
json_format	Format/beautify JSON
json_minify	Minify JSON
json_validate	Validate JSON syntax
json_to_yaml	Convert JSON to YAML
json_to_typescript	Generate TypeScript interfaces from JSON

Encoding Tools

Tool	Description
base64_encode	Encode text to Base64
base64_decode	Decode Base64 to text
url_encode	URL-encode a string
url_decode	URL-decode a string
html_encode	Encode HTML special characters
html_decode	Decode HTML entities
number_base_convert	Convert between binary, octal, decimal, hex

Security Tools

Tool	Description
hash_generate	Generate MD5, SHA-1, SHA-256, SHA-512 hashes
uuid_generate	Generate UUID v4
password_generate	Generate secure random passwords
jwt_decode	Decode JWT tokens
chmod_calculate	Calculate Unix permissions

Data Tools

Tool	Description
timestamp_convert	Convert Unix timestamps ↔ ISO dates
csv_to_json	Convert CSV to JSON
json_to_csv	Convert JSON to CSV
cron_explain	Explain CRON expressions

Text Tools

Tool	Description
string_case_convert	Convert between camelCase, snake_case, kebab-case, etc.
regex_test	Test regex patterns
text_diff	Compare two texts
slug_generate	Generate URL slugs

As Claude Code Plugin

# Clone and use as plugin
git clone https://github.com/Rih0z/devtools-mcp
claude plugin add ./devtools-mcp

The plugin includes a skill file that makes all tools available as background knowledge.

Features

• MCP spec compliant: Proper isError: true error handling
• RFC 4180 CSV parser: Handles quoted fields, escaped quotes, CRLF
• ReDoS protection: Pattern and input size limits
• YAML type safety: Quotes ambiguous string values
• 46 tests passing: Comprehensive edge case coverage
• Zero dependencies beyond MCP SDK and zod

Web Version

All these tools (plus 50 more) are available as a free web app at usedevtools.com.

API

DevToolBox also provides a JSON API for programmatic tool discovery:

GET https://usedevtools.com/api/tools
GET https://usedevtools.com/api/tools?category=data
GET https://usedevtools.com/api/tools?q=json

License

MIT — EZARK Consulting Inc.