> ## Documentation Index
> Fetch the complete documentation index at: https://algolia.com/llms.txt
> Use this file to discover all available pages before exploring further.

# decompoundQuery

> Split compound words into parts in the query.

export const Setting = ({type, default: defaultValue, defaultNote, scope, min, max, formerly}) => {
  const renderedDefault = defaultValue === '' ? '""' : defaultValue;
  const renderedNote = defaultNote ? `(${defaultNote})` : '';
  return <ul>
      <li><strong>Type:</strong> <code>{type}</code></li>
      <li><strong>Default:</strong> <code>{renderedDefault}</code>{renderedNote}</li>
      {min && <li><strong>Min:</strong> <code>{min}</code></li>}
      {max && <li><strong>Max:</strong> <code>{max}</code></li>}
      <li><strong>Scope:</strong> <a href="/doc/api-reference/api-parameters"><code>{scope}</code></a></li>
      {formerly && <li>
          <strong>Deprecated name:</strong> <code>{formerly}</code>
        </li>}
    </ul>;
};

<Setting type="boolean" default="true" scope="settings,search" />

The `decompoundQuery` parameter controls splitting compound words in the query into their component parts.

Decompounding is available for these [`queryLanguages`](/doc/api-reference/api-parameters/queryLanguages): German, Dutch, Finnish, Danish, Swedish, and Norwegian.

## Usage

* If `true` (default), compound words are split into multiple parts to improve recall.
  For example, the Dutch query `"schoolboeken"` (school books) will match `"school"`, `"boeken"`, and `"schoolboeken"`.

* If `false`, compound words are matched as-is.\
  This is useful when you want to preserve precise matches for product names, legal terms, or brand names.\
  For example, `"gartenstühle"` (garden chairs in German) would only match `"gartenstühle"`.

* Decompounding doesn't apply to decomposed Unicode characters with combining marks.
  For example, `"Gartenstühle"` (using `u` + combining `◌̈`) won't be split,
  but `"Gartenstühle"` (single `ü` character) will be.

* To control decompounding for individual attributes, see [`decompoundedAttributes`](/doc/api-reference/api-parameters/decompoundedAttributes).

## Examples

### Enable splitting compound words by default

<AccordionGroup>
  <Accordion title="Current API clients" defaultOpen="true">
    <CodeGroup>
      ```cs C# theme={"system"}
      var response = await client.SetSettingsAsync(
        "INDEX_NAME",
        new IndexSettings { DecompoundQuery = true }
      );
      ```

      ```dart Dart theme={"system"}
      final response = await client.setSettings(
        indexName: "INDEX_NAME",
        indexSettings: IndexSettings(
          decompoundQuery: true,
        ),
      );
      ```

      ```go Go theme={"system"}
      response, err := client.SetSettings(client.NewApiSetSettingsRequest(
        "INDEX_NAME",
        search.NewEmptyIndexSettings().SetDecompoundQuery(true)))
      if err != nil {
        // handle the eventual error
        panic(err)
      }
      ```

      ```java Java theme={"system"}
      UpdatedAtResponse response = client.setSettings("INDEX_NAME", new IndexSettings().setDecompoundQuery(true));
      ```

      ```js JavaScript theme={"system"}
      const response = await client.setSettings({ indexName: 'theIndexName', indexSettings: { decompoundQuery: true } });
      ```

      ```kotlin Kotlin theme={"system"}
      var response =
        client.setSettings(
          indexName = "INDEX_NAME",
          indexSettings = IndexSettings(decompoundQuery = true),
        )
      ```

      ```php PHP theme={"system"}
      $response = $client->setSettings(
          'INDEX_NAME',
          ['decompoundQuery' => true,
          ],
      );
      ```

      ```python Python theme={"system"}
      response = client.set_settings(
          index_name="INDEX_NAME",
          index_settings={
              "decompoundQuery": True,
          },
      )
      ```

      ```ruby Ruby theme={"system"}
      response = client.set_settings("INDEX_NAME", Algolia::Search::IndexSettings.new(decompound_query: true))
      ```

      ```scala Scala theme={"system"}
      val response = Await.result(
        client.setSettings(
          indexName = "INDEX_NAME",
          indexSettings = IndexSettings(
            decompoundQuery = Some(true)
          )
        ),
        Duration(100, "sec")
      )
      ```

      ```swift Swift theme={"system"}
      let response = try await client.setSettings(
          indexName: "INDEX_NAME",
          indexSettings: IndexSettings(decompoundQuery: true)
      )
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="Legacy API clients">
    <CodeGroup>
      ```cs C# theme={"system"}
      IndexSettings settings = new IndexSettings
      {
        DecompoundQuery = true
      };

      index.SetSettings(settings);

      // Asynchronous
      await index.SetSettings(settings);
      ```

      ```go Go theme={"system"}
      res, err := index.SetSettings(search.Settings{
      	DecompoundQuery: opt.DecompoundQuery(true),
      })
      ```

      ```java Java theme={"system"}
      IndexSettings setting = new IndexSettings().setDecompoundQuery(true);
      // Synchronous
      index.setSettings(setting);
      // Asynchronous
      index.setSettingsAsync(setting);
      ```

      ```js JavaScript theme={"system"}
      index.setSettings({
        decompoundQuery: true,
      });
      ```

      ```kotlin Kotlin theme={"system"}
      val settings = settings {
          decompoundQuery = true
      }
      index.setSettings(settings)
      ```

      ```php PHP theme={"system"}
      $index->setSettings(array(
        'decompoundQuery' => true,
      ));
      ```

      ```python Python theme={"system"}
      index.set_settings(
          {
              "decompoundQuery": True,
          }
      )
      ```

      ```ruby Ruby theme={"system"}
      index.set_settings(
        {
          decompoundQuery: true
        }
      )
      ```

      ```scala Scala theme={"system"}
      client.execute {
        setSettings of "myIndex" `with` IndexSettings(
          decompoundQuery = Some(true)
        )
      }
      ```

      ```swift Swift theme={"system"}
      let settings = Settings()
        .set(\.decompoundQuery, to: true)

      index.setSettings(settings) { result in
        if case .success(let response) = result {
          print("Response: \(response)")
        }
      }
      ```
    </CodeGroup>
  </Accordion>
</AccordionGroup>

### Enable splitting compound words for the current search

<AccordionGroup>
  <Accordion title="Current API clients" defaultOpen>
    <CodeGroup>
      ```cs C# theme={"system"}
      var response = await client.SearchSingleIndexAsync<Hit>(
        "INDEX_NAME",
        new SearchParams(new SearchParamsObject { Query = "query", DecompoundQuery = true })
      );
      ```

      ```dart Dart theme={"system"}
      final response = await client.searchSingleIndex(
        indexName: "INDEX_NAME",
        searchParams: SearchParamsObject(
          query: "query",
          decompoundQuery: true,
        ),
      );
      ```

      ```go Go theme={"system"}
      response, err := client.SearchSingleIndex(client.NewApiSearchSingleIndexRequest(
        "INDEX_NAME").WithSearchParams(search.SearchParamsObjectAsSearchParams(
        search.NewEmptySearchParamsObject().SetQuery("query").SetDecompoundQuery(true))))
      if err != nil {
        // handle the eventual error
        panic(err)
      }
      ```

      ```java Java theme={"system"}
      SearchResponse response = client.searchSingleIndex(
        "INDEX_NAME",
        new SearchParamsObject().setQuery("query").setDecompoundQuery(true),
        Hit.class
      );
      ```

      ```js JavaScript theme={"system"}
      const response = await client.searchSingleIndex({
        indexName: 'indexName',
        searchParams: { query: 'query', decompoundQuery: true },
      });
      ```

      ```kotlin Kotlin theme={"system"}
      var response =
        client.searchSingleIndex(
          indexName = "INDEX_NAME",
          searchParams = SearchParamsObject(query = "query", decompoundQuery = true),
        )
      ```

      ```php PHP theme={"system"}
      $response = $client->searchSingleIndex(
          'INDEX_NAME',
          ['query' => 'query',
              'decompoundQuery' => true,
          ],
      );
      ```

      ```python Python theme={"system"}
      response = client.search_single_index(
          index_name="INDEX_NAME",
          search_params={
              "query": "query",
              "decompoundQuery": True,
          },
      )
      ```

      ```ruby Ruby theme={"system"}
      response = client.search_single_index(
        "INDEX_NAME",
        Algolia::Search::SearchParamsObject.new(query: "query", decompound_query: true)
      )
      ```

      ```scala Scala theme={"system"}
      val response = Await.result(
        client.searchSingleIndex(
          indexName = "INDEX_NAME",
          searchParams = Some(
            SearchParamsObject(
              query = Some("query"),
              decompoundQuery = Some(true)
            )
          )
        ),
        Duration(100, "sec")
      )
      ```

      ```swift Swift theme={"system"}
      let response: SearchResponse<Hit> = try await client.searchSingleIndex(
          indexName: "INDEX_NAME",
          searchParams: SearchSearchParams.searchSearchParamsObject(SearchSearchParamsObject(
              query: "query",
              decompoundQuery: true
          ))
      )
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="Legacy API clients">
    <CodeGroup>
      ```cs C# theme={"system"}
      var result = index.Search(new Query("query string")
      {
        DecoumpoundQuery = true
      });
      ```

      ```go Go theme={"system"}
      res, err := index.Search(
        "query",
        opt.DecompoundQuery(true),
      })
      ```

      ```java Java theme={"system"}
      Query query = new Query("query");
      query.setDecompoundQuery(true);
      index.search(query);
      ```

      ```js JavaScript theme={"system"}
      index
        .search("query", {
          decompoundQuery: true,
        })
        .then(({ hits }) => {
          console.log(hits);
        });
      ```

      ```kotlin Kotlin theme={"system"}
      val query = Query(query = "query", decompoundQuery = true)
      index.search(query)
      ```

      ```php PHP theme={"system"}
      $res = $index->search('query string', [
        'decompoundQuery' => true
      ]);
      ```

      ```python Python theme={"system"}
      index.search("query", {"decompoundQuery": True})
      ```

      ```ruby Ruby theme={"system"}
      index.search(
        "query",
        {
          decompoundQuery: true
        }
      )
      ```

      ```scala Scala theme={"system"}
      client.execute {
        search into "myIndex" query Query(query = Some("query"), decompoundQuery = Some(true))
      }
      ```

      ```swift Swift theme={"system"}
      let query = Query("query")
        .set(\.decompoundQuery, to: true)

      index.search(query: query) { result in
        if case .success(let response) = result {
          print("Response: \(response)")
        }
      }
      ```
    </CodeGroup>
  </Accordion>
</AccordionGroup>