IDBVersionChangeEvent: oldVersion property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

Note: This feature is available in Web Workers.

The oldVersion read-only property of the IDBVersionChangeEvent interface returns the old version number of the database.

When the opened database doesn't exist yet, the value of oldVersion is 0.

Value

A number containing a 64-bit integer.

Examples

const dbName = "sampleDB";
const dbVersion = 2;
const request = indexedDB.open(dbName, dbVersion);
request.onupgradeneeded = (e) => {
 const db = request.result;
 if (e.oldVersion < 1) {
 db.createObjectStore("store1");
 }
 if (e.oldVersion < 2) {
 db.deleteObjectStore("store1");
 db.createObjectStore("store2");
 }
 // etc. for version < 3, 4...
};