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2.1.6 • Public • Published


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A database reader for IP2Location paid, free, and sample databases. This is derivative work, based on github.com/ip2location-nodejs/IP2Location.


This module has been tested with Node.js LTS 14, 16, and 18. Feel free test other versions of Node.js and let me know if you encounter compatibility issues.

Local installation

npm install ip2ldb-reader


import Ip2lReader from 'ip2ldb-reader';
// Or using require() syntax:
// const Ip2lReader = require('ip2ldb-reader').Ip2lReader;

// Define database reader options
const options = {...};

// Construct an instance of Ip2lReader
const ip2lReader = new Ip2lReader();

// Initialize reader with the IP2Location database
await ip2lReader.init('/path/to/database.bin', options);

// Get geolocation data for IP addresses
const ipv6data = ip2lReader.get('2001:4860:4860::8888');
const ipv4data = ip2lReader.get('');

// Close the database and uninitialize the reader


  // {boolean} Cache database in memory
  cacheDatabaseInMemory: false,

  // {boolean} Watch filesystem for database updates and reload if detected
  reloadOnDbUpdate: false,

  // {string} Path to subdivision CSV database
  subdivisionCsvPath: undefined,

  // {string} Path to GeoName ID CSV database
  geoNameIdCsvPath: undefined,

  // {string} Path to country info CSV database
  countryInfoCsvPath: undefined,

  // {string} Path to IATA/ICAO airport CSV database
  iataIcaoCsvPath: undefined,

Additional information

  • cacheDatabaseInMemory - Read entire database into memory on intialization.
  • reloadOnDbUpdate - When enabled, the database file is monitored for changes with a 500ms debounce.
    • If cacheDatabaseInMemory is false (the default case), the database reader is put into the INITIALIZING state on the leading edge of the debounce. Attempts to read from the database short circuit and do not touch the filesystem. The updated database is reloaded on the trailing edge of the debounce. This means there is a minimum of 500ms where geolocation requests will receive {status: "INITIALIZING"} responses.
    • If cacheDatabaseInMemory is true, the reader will continue to return results from the cached database while the updated database loads. There is no interruption in service.
  • subdivisionCsvPath - When a filesystem path to the IP2Location ISO 3166-2 Subdivision Code CSV database is provided, the country code and region will be used to identify the corresponding subdivision code.
  • geoNameIdCsvPath - When a filesystem path to the IP2Location GeoName ID CSV database is provided, the country code, region, and city will be used to identify the corresponding GeoName ID.
  • countryInfoCsvPath - When a filesystem path to the IP2Location Country Information CSV database is provided, the country code will be used to identify additional country information (capital, population, currency, language, etc.).
  • iataIcaoCsvPath - When a filesystem path to the IP2Location IATA/ICAO airport CSV database is provided, the country code and region will be used to identify airports in the region.


The object returned by Ip2lReader.get(ip) has the following structure:

  ip: string | null;
  ip_no: string | null;
  status: string | null;

  addresstype?: string;
  airports?: IataIcaoData[] | null;
  areacode?: string;
  as?: string;
  asn?: string;
  category?: string;
  city?: string;
  country_info?: CountryInfoData | null;
  country_long?: string;
  country_short?: string;
  district?: string;
  domain?: string;
  elevation?: string;
  geoname_id?: number | null;
  iddcode?: string;
  isp?: string;
  latitude?: number | null;
  longitude?: number | null;
  mcc?: string;
  mnc?: string;
  mobilebrand?: string;
  netspeed?: string;
  region?: string;
  subdivision?: string;
  timezone?: string;
  usagetype?: string;
  weatherstationcode?: string;
  weatherstationname?: string;
  zipcode?: string;


CountryInfoData = {
    capital: string;
    cctld?: string;
    country_alpha3_code?: string;
    country_code: string;
    country_demonym?: string;
    country_name?: string;
    country_numeric_code?: number | null;
    currency_code?: string;
    currency_name?: string;
    currency_symbol?: string;
    idd_code?: number | null;
    lang_code?: string;
    lang_name?: string;
    population?: number | null;
    total_area: number | null;


IataIcaoData = {
    airport: string;
    iata: string;
    icao: string;
    latitude: number | null;
    longitude: number | null;

Properties suffixed by ? only exist if the database supports them. For example, when using a DB1 (country only) database, a sample return object looks like

  ip: "",
  ip_no: "134744072",
  status: "OK",
  country_short: "US",
  country_long: "United States of America"

Possible values for status include:

  • OK - Successful search for geolocation data
  • INITIALIZING - Database reader is initializing and is not ready to receive requests
  • NOT_INITIALIZED - Database reader failed to initialize
  • IP_ADDRESS_NOT_FOUND - IP address has correct format, but database does not contain data for it
  • INVALID_IP_ADDRESS - IP address does not have correct format
  • IPV6_NOT_SUPPORTED - Unable to lookup IPv6 address because database does not support them
  • DATABASE_NOT_FOUND - Database is missing from the filesystem

When no geolocation data is available for a supported property in the return object:

  • String values are empty ("")
  • Number values are null (null)

Upgrade notes

  • Prior to version 2.0, unknown number values were reported as zero (0). Beginning with version 2.0, unknown numbers are reported as null (null);


See available build, lint, clean, etc. scripts with npm run.

Unit tests require the following database files to be made available in folder database within the project directory:

Note that the sample DB26 database is expected for unit tests, not the full, paid database.

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