# Questionnaires

Canonical page: https://docs.ovok.com/java-sdk/questionnaires

`ovok.questionnaires()` runs FHIR Questionnaire operations, such as `$populate`.

```java
JsonNode prefilled = ovok.questionnaires().populate("questionnaire-id");
```

Every method is in the [`QuestionnairesResource` reference](/java-sdk/reference/questionnaires-resource).