---
title: "Get entered PDF password | Nutrient"
canonical_url: "https://www.nutrient.io/guides/web/knowledge-base/get-entered-document-password/"
md_url: "https://www.nutrient.io/guides/web/knowledge-base/get-entered-document-password.md"
last_updated: "2026-06-09T10:30:03.998Z"
description: "Capture the password entered by users in a password-protected document using MutationObservers and event listeners. Enhance document security with this implementation."
---

To capture the password entered by the user when opening a document, add an event listener to `change` events on the password input DOM element rendered by Nutrient when a document is password-protected and an input is needed.

Since the `NutrientViewer.Instance` reference doesn’t resolve until a password is used and the document is finally opened, you can rely on one `MutationObserver` to act upon the rendering of the main Nutrient container, and then add a second `MutationObserver` to capture a reference to the `password` input presented. All of this should be done before the call to `NutrientViewer.load`:

```js

let passwordEntered = "";

const config = {
  childList: true,
  subtree: true
};

const observer = new MutationObserver((_, observer) => {
  const mainIframe = defaultConfiguration.container.querySelector(
    'iframe[title="PSPDFKit"]'
  );
  if (mainIframe) {
    const innerObserver = new MutationObserver((_, observer) => {
      const passwordInput = mainIframe.contentDocument.querySelector(
        'input[name="password"]'
      );
      if (passwordInput) {
        passwordInput.addEventListener("change", (e) => {
          passwordEntered = e.target.value;
        });
        observer.disconnect();
      }
    });
    innerObserver.observe(mainIframe.contentDocument, config);

    observer.disconnect();
  }
});

observer.observe(defaultConfiguration.container, config);

NutrientViewer.load(defaultConfiguration);

```

This has been tested with Nutrient Web SDK 2021.2.0.

---

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