Create Presentations in JavaScript

Overview

This article shows how to create a presentation in Aspose.Slides, add a text box to its first slide, and save the result as a file.

Before you begin, install the aspose.slides.via.java package from npm, together with the JDK, Python, and C++ build tools it needs. See Installation.

Create a PowerPoint Presentation

To create a presentation and put a text box on its first slide, follow these steps:

  1. Create an instance of the Presentation class. A new presentation already contains one empty slide.
  2. Get that slide from the slide collection by its index, 0.
  3. Add a rectangle with the addAutoShape method and set its text with setText.
  4. Save the presentation as a PPTX file with the save method.
  5. Release the presentation with the dispose method, and end the process.
const asposeSlides = require("aspose.slides.via.java");

const presentation = new asposeSlides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);
    const shape = slide.getShapes().addAutoShape(asposeSlides.ShapeType.Rectangle, 50, 50, 400, 100);
    shape.getTextFrame().setText("Hello, Aspose.Slides!");
    presentation.save("hello.pptx", asposeSlides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

// Aspose.Slides runs in a Java virtual machine that keeps Node.js running, so end the process explicitly.
process.exit(0);

The rectangle’s top-left corner is 50 points from the left edge and 50 points from the top edge of the slide, and the rectangle is 400 points wide and 100 points high. Save the code as hello.js in your project folder and run node hello.js: it saves hello.pptx, with one slide holding that rectangle and its text, in the current folder.

Aspose.Slides runs in a Java virtual machine that the java package starts inside the Node.js process. That virtual machine keeps Node.js from exiting on its own after the script finishes, so the example ends with process.exit(0).

Without a license, Aspose.Slides also adds an evaluation watermark to every slide it saves; see Licensing.

FAQ

What formats can I save a new presentation to?

You can save to PPTX, PPT, and ODP, and export to PDF, XPS, HTML, SVG, and images, among others.

Can I start from a template (POTX/POTM) and save as a regular PPTX?

Yes. Load the template and save to the desired format; POTX/POTM/PPTM and similar formats are supported.

How do I control slide size/aspect ratio when creating a presentation?

Set the slide size (including presets like 4:3 and 16:9 or custom dimensions) and choose how content should scale.

In what units are sizes and coordinates measured?

In points: 1 inch equals 72 units.

How do I handle very large presentations (with many media files) to reduce memory usage?

Use BLOB management strategies, limit in-memory storage by leveraging temporary files, and prefer file-based workflows over purely in-memory streams.

Can I create/save presentations in parallel?

You cannot operate on the same Presentation instance from multiple threads. Run separate, isolated instances per thread or process.

How do I remove the trial watermark and limitations?

Apply a license once per process. The license XML must remain unmodified, and the license setup should be synchronized if multiple threads are involved.

Can I digitally sign the PPTX I create?

Yes. Digital signatures (adding and verifying) are supported for presentations.

Are macros (VBA) supported in created presentations?

Yes. You can create/edit VBA projects and save macro-enabled files such as PPTM/PPSM.

Open Presentations in JavaScript