Stacks Whois

When parse is false (default), it still calls WhoIsParser.parseData(rawData, null) which parses with the default field set. When parse is true and options.parseData is provided, it uses a shallow copy of that object as the parse template.

Flow:

1. Determine TLD from domain (or use options.tld)
2. Find WHOIS server: check SERVERS map first, then query IANA via findWhoIsServer()
3. Get query parameters via getParameters() for the server
4. Execute TCP query via tcpWhois()
5. Parse response via WhoIsParser.parseData()
6. Returns { _raw: string, parsedData: any | null }

lookup() -- Parsed Lookup Shortcut

function lookup(domain: string, options?: WhoIsOptions | null): Promise<WhoIsResponse>

Calls whois(domain, true, options) -- always parses the response.

batchWhois() -- Batch Lookups

async function batchWhois(
  domains: string[],
  parallel?: boolean,       // default: false
  threads?: number,         // default: 1 (batch size for parallel mode)
  parse?: boolean,          // default: false
  options?: WhoIsOptions | null,
): Promise<WhoIsResponse[]>

• Sequential mode (parallel=false): processes domains one at a time
• Parallel mode (parallel=true): processes in batches of threads size using Promise.all
• If threads > domains.length, clamps to domains.length
• Note: In parallel mode, only the last batch's results are returned (response is reassigned, not concatenated)

tcpWhois() -- Raw TCP Query

async function tcpWhois(
  domain: string,
  queryOptions: string,     // server-specific prefix (e.g., '-T dn,ace')
  server: string,
  port: number,             // default 43
  encoding: string,         // default 'utf-8'
  proxy: ProxyData | null,
): Promise<string>

• Without proxy: creates Net.Socket, connects directly to WHOIS server on specified port
• With proxy: uses SocksClient.createConnection() to tunnel through SOCKS proxy
• Sends query as "<queryOptions> <domain>\r\n" or "<domain>\r\n" if no queryOptions
• Uses TextDecoder with specified encoding for response

Server Discovery

findWhoIsServer() -- Remote IANA Lookup

async function findWhoIsServer(tld: string): Promise<string>

Fetches https://www.iana.org/whois?q=<tld> and extracts server from whois:\s+(\S+) regex match. Returns empty string on failure.

getWhoIsServer() -- Local Lookup

function getWhoIsServer(tld: keyof typeof SERVERS): string | undefined

Looks up TLD in the built-in SERVERS map. Special case: 'com' always returns 'whois.verisign-grs.com'.

getTLD() -- Extract TLD

function getTLD(domain: string): keyof typeof SERVERS

Splits domain by . and checks from longest suffix first against the SERVERS map. For example, sub.example.co.uk checks co.uk first (which exists in SERVERS), not just uk. Falls back to the last part if no match found.

getParameters() -- Server Query Parameters

function getParameters(server: string): string | undefined

Returns server-specific query format from the PARAMETERS map.

WhoIsParser

class WhoIsParser {
  // Parse raw WHOIS text with custom or default field template
  static parseData(rawData: string, outputData: any | null): any

  // Internal iterative parser (private)
  private static iterParse(rawData: string, outputData: any): any
}

When outputData is null, parseData() uses this default template:

{
  'Domain Name': '',
  'Creation Date': '',
  'Updated Date': '',
  'Registry Expiry Date': '',
  'Domain Status': [],       // array collects multiple values
  'Registrar': '',
}

The parser iterates character by character through raw WHOIS text:

• Keys are identified when a line matches a key in outputData
• Values follow after ": " separator
• Array-typed fields (like Domain Status) accumulate multiple values
• Parsing stops at "Record maintained by" or ">>>" markers

Custom parse templates: pass an object with the field names you want extracted. Use empty string '' for single values, use [] for fields with multiple values.

const result = await whois('example.com', true, {
  parseData: {
    'Domain Name': '',
    'Domain Status': [],     // collects ALL status values
    'Registrar': '',
    'Name Server': [],       // collects ALL name servers
  }
})

Types

WhoIsResponse

interface WhoIsResponse {
  _raw: string              // raw text from WHOIS server
  parsedData: any | null    // parsed key-value pairs (null on error)
}

WhoIsOptions

interface WhoIsOptions {
  tld?: string | null              // override TLD detection
  encoding?: string | null         // character encoding (default: 'utf-8')
  proxy?: ProxyData | null         // SOCKS proxy configuration
  server?: string | null           // override WHOIS server
  serverPort?: number | null       // override port (default: 43)
  parseData?: object | null        // custom parse template (keys to extract)
}

ProxyData

interface ProxyData {
  ip: string
  port: number
  username?: string | null
  password?: string | null
  type: ProxyType
}

ProxyType

enum ProxyType {
  SOCKS4 = 0,
  SOCKS5 = 1,
}

Note: ProxyType.SOCKS4 = 0 and ProxyType.SOCKS5 = 1 -- these are mapped to SOCKS versions 4 and 5 internally when creating SocksClient options.

SOCKS Proxy Support

const result = await whois('example.com', false, {
  proxy: {
    ip: '127.0.0.1',
    port: 1080,
    type: ProxyType.SOCKS5,
    username: 'user',        // optional
    password: 'pass',        // optional
  }
})

Built-in SocksClient (socks.ts)

Native SOCKS client implementation using node:net. Replaces the socks npm package.

class SocksClient {
  static createConnection(
    options: SocksClientOptions,
    callback: (err: Error | null, info?: SocksClientEstablishedEvent) => void,
  ): void
}

interface SocksClientOptions {
  proxy: SocksProxy
  command: 'connect' | 'bind' | 'associate'
  destination: SocksDestination
}

interface SocksProxy {
  host: string
  port: number
  type: 4 | 5               // SOCKS version
  userId?: string
  password?: string
}

interface SocksDestination {
  host: string
  port: number
}

interface SocksClientEstablishedEvent {
  socket: Net.Socket
  remoteHost?: string
  remotePort?: number
}

SOCKS4 Implementation

• Supports SOCKS4 and SOCKS4a (domain name support via special IP marker 0.0.0.1)
• Request format: VN(1) + CD(1) + DSTPORT(2) + DSTIP(4) + USERID(var) + NULL(1)
• Success response: status byte 0x5A (90)

SOCKS5 Implementation

• Three-step handshake: greeting -> authentication (optional) -> connect request
• Supports no-auth (0x00) and username/password auth (0x02)
• Supports IPv4 (0x01), IPv6 (0x04), and domain name (0x03) address types
• Detailed error messages for all SOCKS5 status codes (general failure, not allowed, network unreachable, host unreachable, connection refused, TTL expired, command not supported, address type not supported)

Constants

IANA_CHK_URL

const IANA_CHK_URL = 'https://www.iana.org/whois?q='

PARAMETERS -- Server-Specific Query Formats

const PARAMETERS: Record<string, string> = {
  'whois.denic.de': '-T dn,ace',
  'whois.nic.fr': '-V Md5.2',
}

SERVERS -- TLD to WHOIS Server Mapping

Comprehensive mapping of hundreds of TLDs to their WHOIS servers. Examples:

• 'com' -> 'whois.verisign-grs.com'
• 'net' -> 'whois.verisign-grs.com'
• 'org' -> 'whois.pir.org'
• 'io' -> 'whois.nic.io'
• 'co.uk' -> compound TLD support via getTLD() longest-match logic
• Country code TLDs, new gTLDs, compound TLDs (e.g., br.com, co.ca)

Utility: shallowCopy (utils.ts)

function shallowCopy<T>(obj: T): T

Recursively copies objects and arrays. Used to clone parseData templates before filling them with parsed values, so the original template is not mutated.

Exports from index.ts

Functions: whois, lookup, batchWhois, tcpWhois, findWhoIsServer, getWhoIsServer, getTLD, getParameters Classes: WhoIsParser, SocksClient Constants: IANA_CHK_URL, PARAMETERS, SERVERS Types: WhoIsResponse, WhoIsOptions, ProxyData, ProxyType, SocksClientOptions

Dependencies

• node:net -- TCP socket connections (direct WHOIS queries and SOCKS client)
• @stacksjs/logging -- log for debug logging during lookups

Gotchas

• whois() with parse=false still parses with default fields -- the parse flag controls whether custom parseData is used
• batchWhois() in parallel mode has a bug: it reassigns response each batch instead of concatenating, so only the last batch's results are returned
• ProxyType enum values are 0 and 1, not 4 and 5 -- they are mapped to SOCKS versions internally
• getWhoIsServer() returns undefined for unknown TLDs, not an empty string
• findWhoIsServer() returns empty string '' on failure (not undefined)
• getTLD() checks compound TLDs (like co.uk) before simple ones via longest-suffix matching
• The parser stops at "Record maintained by" or ">>>" markers in the raw response
• WHOIS servers are rate-limited -- batch queries should use small thread counts
• shallowCopy() is a recursive deep copy despite its name -- it clones nested objects and arrays
• TCP connections use node:net Socket, not fetch -- WHOIS is a raw TCP protocol on port 43
• The SOCKS client uses callback-style API, not promises
• Query options are prepended to the domain in the TCP query (e.g., "-T dn,ace example.de\r\n")