@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

# Option 1: npx (after npm publish)
claude mcp add devtools-mcp -- npx @ezark/devtools-mcp

# Option 2: From GitHub (works now)
git clone https://github.com/Rih0z/devtools-mcp.git ~/.local/share/devtools-mcp
cd ~/.local/share/devtools-mcp && npm install && npm run build
claude mcp add devtools-mcp -- node ~/.local/share/devtools-mcp/dist/index.js

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.