state_city_pincode/index.js

A utility package giving a list of postal codes for the received state and city. Currently works for India

// Import the pincode map from a separate module
const pincodeMap = require("./state_city_code.js");
const pincodeStateMap = require("./code_city_state.js")
const states = require("./state.js")
const cities = require("./city.js")
/**
 * Retrieve a list of pincodes based on the provided state and city.
 * @param {string} state - The state for which you want to fetch pincodes.
 * @param {string} city - The city within the state for which you want to fetch pincodes.
 * @returns {Promise<Array<string>>} An array of pincodes corresponding to the state and city.
 */
function pincodeList(state, city) {
    // Create a key to look up in the pincodeMap
    const key = state.toLowerCase() + "_" + city.toLowerCase();

    // Check if the key exists in the map
    if (pincodeMap[key]) {
        return pincodeMap[key];
    }

    // If the key is not found, return an empty array
    return [];
}

function stateCityName(pincode) {
    const key = pincode;

    // Check if the key exists in the map
    if (pincodeStateMap[key]) {
        return pincodeStateMap[key];
    }

    // If the key is not found, return an empty array
    return {};
}

function getStates() {
    return states;
}

function getCities(state) {
    const key = state.toLowerCase()
    if (cities[key]) {
        return cities[key]
    }
    return []
}


// Export the pincodeList function so it can be used in other modules
module.exports = { pincodeList, stateCityName, getStates, getCities }