createObjectStores1.js

let DB_NAME = 'testIDB' // Name of database => one origin can have as many databases as it wants.
let OBJECT_STORE_NAME = 'testObjectStore' // Name of object store. => one database can have as many object store as it wants.

let request = indexedDB.open(DB_NAME, 1) // fire to open DB named 'testIDB' version 1.

request.onupgradeneeded = (e) => {
    let db = request.result;
    let objectStore = db.createObjectStore(OBJECT_STORE_NAME,{keyPath:"id"});
    console.info('database and object store created');
};

request.onerror = (e) => {
    console.log(e);
    //when something went wrong and failed to open the database.
    //Most likely, this happens when user did not allow the application to access indexeddb.
}

request.onsuccess = (e) => {
   //when request was made successfully
   console.log(e)
}