PouchDB Interview Questions & Answers (2025)

PouchDB is an open-source NoSQL database that is Javascript implementation Apache CouchDB Database.It is a cross-browser, lightweight,easy to learn NoSQL database that comes with offline data storage and retrieval support.

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Some of the features of PouchDB are as follows:

• PouchDB is a very lightweight API.
• PouchDB application can be run in various browsers.
• PouchDB is easy to Learn.
• PouchDB is an Open Source Application and also available on GitHub.

Advantages of PouchDB are:

• PouchDB is extremely fast.
• There is no need to perform queries over the network.
• PouchDB facilitates you to synchronize the data with any of the supported servers.

PouchDB Server is built on Node.js and PouchDB, and it is used as a drop-in replacement for CouchDB.

PouchDB - PouchDB is an open-source, NoSQL, in-line database written in JavaScript language. The data is stored locally using IndexedDB and WebSQL in the browser.

CouchDB - CouchDB is also an open-source, document-oriented, NoSQL database developed by the Apache software. It is a multi-master application that uses multiple formats and protocols to store, transfer, and process its data.

The browsers that are supported by pouchdb are :

• Chrome 30+ versions
• Safari 5+ versions
• Internet Explorer 10+ versions
• Opera 21+ versions
• Android 4.0+ versions
• iOS 7.1+ versions
• Windows Phone 8+ versions
• Firefox 29+ versions

In Pouchdb, the data is stored in the disc therefore it would remain available after refreshing the page.

To create a local database, you simply call the new PouchDB and give it a name. For example var db = new PouchDB('books');

The best alternatives to PouchDB are

• MongoDB
• Amazon DynamoDB
• MongoDB
• Atlas Redis
• Couchbase Server

Sync- It is used to sync the database. For example - var sync = PouchDB.sync(src, target, [options]), here Sync data from src to target and target to src. This is a convenience method for bidirectional data replication.

Upsert- Upsert is basically insert or update. It is basically borrowing a phrase from traditional databases that uses the pouchdb-upsert plugin to implement.