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<title data-rh="true">Fulltext Search 👑 | RxDB - JavaScript Database</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://rxdb.info/img/rxdb_social_card.png"><meta data-rh="true" name="twitter:image" content="https://rxdb.info/img/rxdb_social_card.png"><meta data-rh="true" property="og:url" content="https://rxdb.info/fulltext-search.html"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Fulltext Search 👑 | RxDB - JavaScript Database"><meta data-rh="true" name="description" content="Master local fulltext search with RxDB's FlexSearch plugin. Enjoy real-time indexing, efficient queries, and offline-first support made easy."><meta data-rh="true" property="og:description" content="Master local fulltext search with RxDB's FlexSearch plugin. Enjoy real-time indexing, efficient queries, and offline-first support made easy."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://rxdb.info/fulltext-search.html"><link data-rh="true" rel="alternate" href="https://rxdb.info/fulltext-search.html" hreflang="en"><link data-rh="true" rel="alternate" href="https://rxdb.info/fulltext-search.html" hreflang="x-default"><link rel="preconnect" href="https://www.google-analytics.com">
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itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Fulltext Search 👑</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Fulltext Search</h1></header>
<p>To run fulltext search queries on the local data, RxDB has a fulltext search plugin based on <a href="https://github.com/nextapps-de/flexsearch" target="_blank" rel="noopener noreferrer">flexsearch</a> and <a href="/rx-pipeline.html">RxPipeline</a>. On each write to a given source <a href="/rx-collection.html">RxCollection</a>, an indexer is running to map the written document data into a fulltext search index.
The index can then be queried efficiently with complex fulltext search operations.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="benefits-of-using-a-local-fulltext-search">Benefits of using a local fulltext search<a href="#benefits-of-using-a-local-fulltext-search" class="hash-link" aria-label="Direct link to Benefits of using a local fulltext search" title="Direct link to Benefits of using a local fulltext search"></a></h2>
<ol>
<li>Efficient Search and Indexing</li>
</ol>
<p>The plugin utilizes the <a href="https://github.com/nextapps-de/flexsearch" target="_blank" rel="noopener noreferrer">FlexSearch library</a>, known for its speed and memory efficiency. This ensures that search operations are performed quickly, even with large datasets. The search engine can handle multi-field queries, partial matching, and complex search operations, providing users with highly relevant results.</p>
<ol start="2">
<li>Local Data Indexing</li>
</ol>
<p>With the plugin, all search operations are performed on the local data stored within the RxDB collections. This means that users can execute fulltext search queries without the need for an external server or database, which is especially beneficial for offline-first applications. The local indexing ensures that search queries are executed quickly, reducing the latency typically associated with remote database queries. Also when used in multiple browser tabs, it is ensured that through <a href="/leader-election.html">Leader Election</a>, only exactly one tabs is doing the work of indexing without having an overhead in the other browser tabs.</p>
<ol start="3">
<li>Real-time Indexing</li>
</ol>
<p>The plugin integrates seamlessly with RxDB's reactive nature. Every time a document is written to an <a href="/rx-collection.html">RxCollection</a>, an indexer updates the fulltext search index in real-time. This ensures that search results are always up-to-date, reflecting the most current state of the data without requiring manual reindexing.</p>
<ol start="4">
<li>Persistent indexing</li>
</ol>
<p>The fulltext search index is efficiently persisted within the <a href="/rx-collection.html">RxCollection</a>, ensuring that the index remains intact across app restarts. When documents are added or updated in the collection, the index is incrementally updated in real-time, meaning only the changes are processed rather than reindexing the entire dataset. This incremental approach not only optimizes performance but also ensures that subsequent app launches are quick, as there's no need to reindex all the data from scratch, making the search feature both reliable and fast from the moment the app starts. When using an <a href="/encryption.html">encrypted storage</a> the index itself and incremental updates to it are stored fully encrypted and are only decrypted in-memory.</p>
<ol start="5">
<li>Complex Query Support</li>
</ol>
<p>The FlexSearch-based plugin allows for <a href="https://github.com/nextapps-de/flexsearch?tab=readme-ov-file#index.search" target="_blank" rel="noopener noreferrer">sophisticated search queries</a>, including multi-term and contextual searches. Users can perform complex searches that go beyond simple keyword matching, enabling more advanced use cases like searching for documents with specific phrases, relevance-based sorting, or even phonetic matching.</p>
<ol start="6">
<li>Offline-First Support and Privacy</li>
</ol>
<p>As RxDB is designed with <a href="/offline-first.html">offline-first applications</a> in mind, the fulltext search plugin supports this paradigm by ensuring that all search operations can be performed offline. This is crucial for applications that need to function in environments with intermittent or no internet connectivity, offering users a consistent and reliable search experience with <a href="/articles/zero-latency-local-first.html">zero latency</a>.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="using-the-rxdb-fulltext-search">Using the RxDB Fulltext Search<a href="#using-the-rxdb-fulltext-search" class="hash-link" aria-label="Direct link to Using the RxDB Fulltext Search" title="Direct link to Using the RxDB Fulltext Search"></a></h2>
<p>The flexsearch search is a <a href="/premium/">RxDB Premium Package 👑</a> which must be purchased and imported from the <code>rxdb-premium</code> npm package.</p>
<p>Step 1: Add the <code>RxDBFlexSearchPlugin</code> to RxDB.</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"> RxDBFlexSearchPlugin </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'rxdb-premium/plugins/flexsearch'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"> addRxPlugin </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'rxdb/plugins/core'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token function" style="color:rgb(80, 250, 123)">addRxPlugin</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">RxDBFlexSearchPlugin</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<p>Step 2: Create a <code>RxFulltextSearch</code> instance on top of a collection with the <code>addFulltextSearch()</code> function.</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"> addFulltextSearch </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'rxdb-premium/plugins/flexsearch'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">const</span><span class="token plain"> flexSearch </span><span class="token operator">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">await</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">addFulltextSearch</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">// unique identifier. Used to store metadata and continue indexing on restarts/reloads.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> identifier</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'my-search'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">// The source collection on whose documents the search is based on</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> collection</span><span class="token operator">:</span><span class="token plain"> myRxCollection</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)">/**</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * Transforms the document data to a given searchable string.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * This can be done by returning a single string property of the document</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * or even by concatenating and transforming multiple fields like:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * doc => doc.firstName + ' ' + doc.lastName</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(80, 250, 123)">docToString</span><span class="token operator">:</span><span class="token plain"> doc </span><span class="token operator">=></span><span class="token plain"> doc</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">firstName</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)">/**</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * (Optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * Amount of documents to index at once.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * See https://rxdb.info/rx-pipeline.html</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> batchSize</span><span class="token operator">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(189, 147, 249)">number</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)">/**</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * (Optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * lazy: Initialize the in memory fulltext index at the first search query.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * instant: Directly initialize so that the index is already there on the first query.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * Default: 'instant'</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> initialization</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'instant'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)">/**</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * (Optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * </span><span class="token doc-comment comment keyword" style="color:rgb(189, 147, 249);font-style:italic">@link</span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> https://github.com/nextapps-de/flexsearch#index-options</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> indexOptions</span><span class="token operator">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<p>Step 3: Run a search operation:</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token comment" style="color:rgb(98, 114, 164)">// find all documents whose searchstring contains "foobar"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">const</span><span class="token plain"> foundDocuments </span><span class="token operator">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">await</span><span class="token plain"> flexSearch</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">find</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">'foobar'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)">/**</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * You can also use search options as second parameter</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> * </span><span class="token doc-comment comment keyword" style="color:rgb(189, 147, 249);font-style:italic">@link</span><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> https://github.com/nextapps-de/flexsearch#search-options</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token doc-comment comment" style="color:rgb(98, 114, 164)"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">const</span><span class="token plain"> foundDocuments </span><span class="token operator">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">await</span><span class="token plain"> flexSearch</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">find</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">'foobar'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"> limit</span><span class="token operator">:</span><span class="token plain"> </span><span class="token number">10</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg 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