JS code to read data in a paginated format.

idb_paginated_read.js

const connection  = indexedDB.open('gautam', 1);

const startIndex = 1;
const stopIndex = 5;

connection.onsuccess = (e) => {
    let results = [];
    let totalCount = 0;
    let advanced = startIndex === 1;
    let counter = startIndex;

    const db = e.target.result;
    const transaction = db.transaction('contacts', 'readonly');

    transaction.oncomplete = event => resolve({ contacts: results, total: totalCount });
    transaction.onerror = event => reject(event.target);
    
    const store = transaction.objectStore('contacts');
    store.count().onsuccess = event => {
        totalCount = event.target.result;
        console.log(`TOTAL COUNT << ${totalCount}`);
    };

    store.openCursor().onsuccess = event => {
        const cursor = event.target.result;
        if (!cursor) {
            console.log(results);
            return;
        }
        if (advanced) {
            counter++;
            results.push(cursor.value);
            if (counter > stopIndex) {
                console.log(results);
                return;
            }
            cursor.continue();
        } else {
            advanced = true;
            cursor.advance(startIndex - 1);
        }     
    };
};