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*   Couchbase

Couchbase
=========

[Couchbase](http://couchbase.com/) is an award-winning distributed NoSQL cloud database that delivers unmatched versatility, performance, scalability, and financial value for all of your cloud, mobile, AI, and edge computing applications.

This guide shows how to use load documents from couchbase database.

Installation
============

*   npm
*   Yarn
*   pnpm

    npm install couchbase

    yarn add couchbase

    pnpm add couchbase

Usage[​](#usage "Direct link to Usage")
---------------------------------------

### Querying for Documents from Couchbase[​](#querying-for-documents-from-couchbase "Direct link to Querying for Documents from Couchbase")

For more details on connecting to a Couchbase cluster, please check the [Node.js SDK documentation](https://docs.couchbase.com/nodejs-sdk/current/howtos/managing-connections.html#connection-strings).

For help with querying for documents using SQL++ (SQL for JSON), please check the [documentation](https://docs.couchbase.com/server/current/n1ql/n1ql-language-reference/index.html).

    import { CouchbaseDocumentLoader } from "langchain/document_loaders/web/couchbase";import { Cluster } from "couchbase";const connectionString = "couchbase://localhost"; // valid couchbase connection stringconst dbUsername = "Administrator"; // valid database user with read access to the bucket being queriedconst dbPassword = "Password"; // password for the database user// query is a valid SQL++ queryconst query = `    SELECT h.* FROM \`travel-sample\`.inventory.hotel h     WHERE h.country = 'United States'    LIMIT 1`;

### Connect to Couchbase Cluster[​](#connect-to-couchbase-cluster "Direct link to Connect to Couchbase Cluster")

    const couchbaseClient = await Cluster.connect(connectionString, {  username: dbUsername,  password: dbPassword,  configProfile: "wanDevelopment",});

### Create the Loader[​](#create-the-loader "Direct link to Create the Loader")

    const loader = new CouchbaseDocumentLoader(  couchbaseClient, // The connected couchbase cluster client  query // A valid SQL++ query which will return the required data);

### Load Documents[​](#load-documents "Direct link to Load Documents")

You can fetch the documents by calling the `load` method of the loader. It will return a list with all the documents. If you want to avoid this blocking call, you can call `lazy_load` method that returns an Iterator.

    // using load methoddocs = await loader.load();console.log(docs);

    // using lazy_loadfor await (const doc of this.lazyLoad()) {  console.log(doc);  break; // break based on required condition}

### Specifying Fields with Content and Metadata[​](#specifying-fields-with-content-and-metadata "Direct link to Specifying Fields with Content and Metadata")

The fields that are part of the Document content can be specified using the `pageContentFields` parameter. The metadata fields for the Document can be specified using the `metadataFields` parameter.

    const loaderWithSelectedFields = new CouchbaseDocumentLoader(  couchbaseClient,  query,  // pageContentFields  [    "address",    "name",    "city",    "phone",    "country",    "geo",    "description",    "reviews",  ],  ["id"] // metadataFields);const filtered_docs = await loaderWithSelectedFields.load();console.log(filtered_docs);

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