[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [IndexedDB](./puppeteer.protocol.indexeddb.md) > [ObjectStoreIndex](./puppeteer.protocol.indexeddb.objectstoreindex.md) > [unique](./puppeteer.protocol.indexeddb.objectstoreindex.unique.md) ## Protocol.IndexedDB.ObjectStoreIndex.unique property If true, index is unique. Signature: ```typescript unique: boolean; ```