> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/generate/create/from-template.md).
# Create PDF from template using Apryse's Web SDK
Learn how to get file data without a viewer. Retrieve document data from a PDF using Document or PDFDoc objects using JavasScript. Opt for getFileData for easy control and safety over saveMemoryBuffer
A PDF can be loaded into a [Document](https://sdk.apryse.com/api/web/Core.Document.html) or [PDFDoc](https://sdk.apryse.com/api/web/Core.PDFNet.PDFDoc.html) object using their respective functions to acquire the document data.
## Getting data from a Document object
To get document data by creating a new `Document` object, the following example shows how to use a `createDocument` to retrieve document data from an external URL.
{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}
const licenseKey = 'visitor.claims.wvKey || "YOUR_LICENSE_KEY"';
const documentURL = 'Enter Document URL Here';
const extension = 'pdf'; // pass extension to option if there is no file extension in documentURL
// create Core.Document instance
Core.createDocument(documentURL, { l: licenseKey, extension })
.then(doc => {
// optionally perform some document processing using read write operations
// found under 'Editing Page Content' or 'Page Manipulation'
doc.getFileData().then(data => {
const arr = new Uint8Array(data);
const blob = new Blob([arr], { type: 'application/pdf' });
// add code for handling Blob here
});
})
.catch(err => { })
[Core.createDocument](https://docs.apryse.com/api/web/Core.html#.createDocument__anchor)
{% endtab %}
{% tab title="JavaScript (SDK v6.0+)" %}
const licenseKey = 'visitor.claims.wvKey || "YOUR_LICENSE_KEY"';
const documentURL = 'Enter Document URL Here';
const extension = 'pdf'; // pass extension to option if there is no file extension in documentURL
// create CoreControls.Document instance
CoreControls.createDocument(documentURL, { l: licenseKey, extension })
.then(doc => {
// optionally perform some document processing using read write operations
// found under 'Editing Page Content' or 'Page Manipulation'
doc.getFileData().then(data => {
const arr = new Uint8Array(data);
const blob = new Blob([arr], { type: 'application/pdf' });
// add code for handling Blob here
});
})
.catch(err => { })
[CoreControls.createDocument](https://docs.apryse.com/api/web/Core.html#.createDocument__anchor)
{% endtab %}
{% endtabs %}
{% hint style="info" %}
`Document` objects also have a `getPDFDoc` function for retrieving an associated `PDFDoc` object. However `getFileData` is preferred over `saveMemoryBuffer` in most cases because `getFileData` gives easy control over the output and is safer (it ensure everything is loaded and it take care of locks). The only reason to use `saveMemoryBuffer` over `getFileData`, is if there isn't an easy way of acquiring a `Document` object or if you need other `PDFDoc` features for controlling the download process.
{% endhint %}
## Getting data from a PDFDoc object
{% hint style="warning" %}
Make sure you have [Full API enabled in WebViewer.](/web/what-is-webviewer/full-api.md)
{% endhint %}
Another way of getting document data is by using the [`saveMemoryBuffer`](https://sdk.apryse.com/api/web/Core.PDFNet.PDFDoc.html#saveMemoryBuffer__anchor) function found on `PDFDoc` objects. An example can be found below
const licenseKey = 'visitor.claims.wvKey || "YOUR_LICENSE_KEY"';
async function main() {
try {
const documentURL = 'Enter Document URL Here';
const pdfDoc = await PDFNet.PDFDoc.createFromURL(documentURL);
pdfDoc.initSecurityHandler();
pdfDoc.lock();
// optionally perform some document processing using read write operations
// found under 'Editing Page Content' or 'Page Manipulation'
const data = await pdfDoc.saveMemoryBuffer(PDFNet.SDFDoc.SaveOptions.e_remove_unused);
const arr = new Uint8Array(data);
const blob = new Blob([arr], { type: 'application/pdf' });
} catch(err) {
console.log(err.stack)
}
}
PDFNet.runWithCleanup(main, licenseKey);
After acquiring a `PDFDoc` object, use the [`saveMemoryBuffer`](https://sdk.apryse.com/api/web/Core.PDFNet.PDFDoc.html#saveMemoryBuffer__anchor) function to retrieve the document data. `saveMemoryBuffer` takes in an enum flag similar to `getFileData` flags. The flags can be found in `PDFNet.SDFDoc.SaveOptions` and their values are:
* `e_remove_unused`
* `e_hex_strings`
* `e_omit_xref`
* `e_linearized`
* `e_compatibility`
There is also an `e_incremental` flag but it's ignored when using `saveMemoryBuffer`. `saveMemoryBuffer` modifies the `PDFDoc` data stored in memory, so it's best practice to acquire a write lock for the document.
---
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.apryse.com/web/generate/create/from-template.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
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