How do I install WhoisJSON?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does WhoisJSON need an API key?

The publisher lists these environment variables: WHOISJSON_API_KEY.

What transport does WhoisJSON use?

WhoisJSON runs locally over stdio.

When was WhoisJSON last checked?

Last checked 2026-10-16. WHOIS, DNS, SSL, and domain availability lookups for AI assistants

WhoisJSON

by io.github.Whoisjson

WHOIS, DNS, SSL, and domain availability lookups for AI assistants

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command

npx -y @whoisjson/[email protected]

Credentials from the publisher

WHOISJSON_API_KEY — Your WhoisJSON API key from whoisjson.com/dashboard

Provider

Claude Code

WHOISJSON_API_KEY=<secret> claude mcp add io.github.whoisjson-mcp-server -- npx -y @whoisjson/[email protected]

Run in a terminal.

Claude Desktop

{
  "mcpServers": {
    "io.github.whoisjson-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@whoisjson/[email protected]"
      ],
      "env": {
        "WHOISJSON_API_KEY": "<secret>"
      }
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Related MCP

Related skills

View all

Questions

How do I install WhoisJSON?: Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does WhoisJSON need an API key?: The publisher lists these environment variables: WHOISJSON_API_KEY.
What transport does WhoisJSON use?: WhoisJSON runs locally over stdio.
When was WhoisJSON last checked?: Last checked 2026-10-16. WHOIS, DNS, SSL, and domain availability lookups for AI assistants

@whoisjson/mcp-server

MCP (Model Context Protocol) server for the WhoisJSON API. Exposes WHOIS, DNS, SSL, and domain availability lookups as tools for AI assistants.

Tools

Tool	Description
`whois_lookup`	WHOIS registration data for a domain (registrar, dates, contacts, nameservers…)
`dns_lookup`	All DNS records for a domain (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, DMARC…)
`ssl_check`	SSL/TLS certificate details and validity for a domain
`domain_availability`	Check if a domain is available for registration

Prerequisites

Sign up at whoisjson.com and copy your API key from the dashboard.
Node.js ≥ 18.

Installation

npm install -g @whoisjson/mcp-server
# or run directly with npx (no install needed):
npx @whoisjson/mcp-server

Configuration

Claude Desktop

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

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json:

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Running locally (development)

cd mcp-server
npm install
npm run build
WHOISJSON_API_KEY=your_key npm start

Publishing

npm run build
npm publish --access public

API reference

Full API documentation: whoisjson.com/documentation

WhoisJSON

by io.github.Whoisjson

WHOIS, DNS, SSL, and domain availability lookups for AI assistants

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command

npx -y @whoisjson/[email protected]

Credentials from the publisher

WHOISJSON_API_KEY — Your WhoisJSON API key from whoisjson.com/dashboard

Provider

Claude Code

WHOISJSON_API_KEY=<secret> claude mcp add io.github.whoisjson-mcp-server -- npx -y @whoisjson/[email protected]

Run in a terminal.

Claude Desktop

{
  "mcpServers": {
    "io.github.whoisjson-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@whoisjson/[email protected]"
      ],
      "env": {
        "WHOISJSON_API_KEY": "<secret>"
      }
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Related MCP

Related skills

View all

Questions

How do I install WhoisJSON?: Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does WhoisJSON need an API key?: The publisher lists these environment variables: WHOISJSON_API_KEY.
What transport does WhoisJSON use?: WhoisJSON runs locally over stdio.
When was WhoisJSON last checked?: Last checked 2026-10-16. WHOIS, DNS, SSL, and domain availability lookups for AI assistants

@whoisjson/mcp-server

MCP (Model Context Protocol) server for the WhoisJSON API. Exposes WHOIS, DNS, SSL, and domain availability lookups as tools for AI assistants.

Tools

Tool	Description
`whois_lookup`	WHOIS registration data for a domain (registrar, dates, contacts, nameservers…)
`dns_lookup`	All DNS records for a domain (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, DMARC…)
`ssl_check`	SSL/TLS certificate details and validity for a domain
`domain_availability`	Check if a domain is available for registration

Prerequisites

Sign up at whoisjson.com and copy your API key from the dashboard.
Node.js ≥ 18.

Installation

npm install -g @whoisjson/mcp-server
# or run directly with npx (no install needed):
npx @whoisjson/mcp-server

Configuration

Claude Desktop

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

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json:

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Running locally (development)

cd mcp-server
npm install
npm run build
WHOISJSON_API_KEY=your_key npm start

Publishing

npm run build
npm publish --access public

API reference

Full API documentation: whoisjson.com/documentation