The document outlines a tutorial on building a REST API for a Node.js application to execute SQL++ (N1QL) queries, retrieving data from a Couchbase database. It assumes the reader has installed the "travel-sample" Bucket and has foundational knowledge from previous articles on Node.js and Couchbase integration. The tutorial covers setting up Couchbase, creating and executing N1QL queries, and integrating these queries into a REST API using Node.js and Express. It highlights the use of primary and secondary indexes for query performance and demonstrates creating reusable queries with named parameters. The tutorial provides a full sample code, showing how to create an endpoint that processes city names as input and returns query results in JSON format. It concludes by suggesting further exploration into error handling and Couchbase documentation for more advanced query usage.