# Creating PDFs with Node.js and the 'PDFKit' library

In the world of web development, there are many different ways to create, view, and edit documents. The most popular of these is undoubtedly the PDF (Portable Document Format). Developed by Adobe, PDFs are the standard for document sharing, both online and off. With Node.js, developers can create PDFs using the PDFKit library. In this article, we'll explore what PDFKit is, and how it can be used to create and enhance PDFs.

## Introduction

Node.js is a JavaScript runtime environment that is used for creating server-side applications. It is fast, efficient, and lightweight, and can be used to create web applications, APIs, and other kinds of software. With Node.js, developers can create powerful server-side applications that can do anything from uploading files to creating complex web apps.

PDFKit is a Node.js library that allows developers to create, manipulate, and edit PDFs. It is a powerful library that can be used to create and modify PDFs, as well as add images, watermarks, and other elements to existing documents. This library is powerful, and can be used to create complex documents with relative ease.

## Working with PDFKit

The first step in working with PDFKit is setting it up. To do this, you'll need to install the library using the Node.js package manager. Once it has been installed, you can start creating PDFs. The first step in creating a PDF is to define the document. This involves setting the size, margins, page direction, and other properties. This is done using the PDFDocument object.

const PDFDocument = require('pdfkit');
const doc = new PDFDocument();

// Set document properties
doc.pageSize('A4');
doc.pageMargins([20, 20, 20, 20]);
doc.pageOrientation('portrait');


Once the document has been defined, you can start adding content to it. This can be done using the PDFDocument methods, such as addPage(), text(), image(), and fill(). For example, to add a line of text to the document, you would use the text() method:

// Add text to the document
doc.text('Hello World!', {
fontSize: 14,
lineGap: 2
});


Once the content has been added, you can configure the layout of the document. This can be done using the layout() method. This method allows you to set the font, margins, and other properties of the document. For example, to set the font family, you would use the fontFamily() method:

// Set the font family
doc.fontFamily('Helvetica');


Once the document has been configured, you can save it using the end() method. This will save the document to the specified location:

// Save the document
doc.end('/path/to/file.pdf');


## Enhancing PDFs with PDFKit

PDFKit is a powerful library that can be used to create and enhance PDFs. One way to enhance a PDF is by adding images. This can be done using the image() method. This method allows you to add an image to the document, as well as set the size, position, and other properties of the image:

// Add an image to the document
doc.image('/path/to/image.jpg', {
width: 500,
height: 300,
x: 0,
y: 0
});


Another way to enhance a PDF is by adding a watermark. This can be done using the fillOpacity() method. This method allows you to set the opacity of the text, which allows you to add a semi-transparent watermark to the document:

// Add a watermark to the document
doc.fillOpacity(0.5);
doc.fillColor('#000000');
doc.text('Confidential', {
fontSize: 48,
lineGap: 2
});


Finally, you can modify the styles of the document. This can be done using the styles() method. This method allows you to set the text alignment, font size, line height, and other properties of the document:

// Set the text alignment
doc.styles('textAlign', 'center');

// Set the font size
doc.styles('fontSize', 14);

// Set the line height
doc.styles('lineHeight', 18);


## Conclusion

The PDFKit library is a powerful tool for creating and enhancing PDFs. It is easy to use, and can be used to create complex documents with relative ease. It can also be used to add images, watermarks, and modify the styles of documents. With the PDFKit library, developers can easily create and edit PDFs using Node.js.

The benefits of using the PDFKit library are many. It is easy to set up, and can be used to create complex documents with relative ease. It is also powerful, and can be used to add images, watermarks, and modify the styles of documents. In short, it is a powerful library that makes creating and editing PDFs a breeze.

In summary, the PDFKit library is a powerful tool for creating and enhancing PDFs. It is easy to set up, and can be used to create complex documents with relative ease. It can also be used to add images, watermarks, and modify the styles of documents. With the PDFKit library, developers can easily create and edit PDFs using Node.js.