![]() The PDF document will be served in the HTTP response from the HTTP API endpoint. The isBase64Encoded flag tells the API Gateway service to render binary content. The body field contains the PDF document encoded as a Base64 string. Here are the response values needed to return a PDF document from the Lambda runtime. Returning PDFs from AWS Lambda FunctionsĪWS Lambda functions control API Gateway responses using a custom JSON response format. HTTP APIs simply need to provide a isBase64Encoded flag in the API response. REST APIs need manual configuration for media types and content handling to support binary responses. Setting up a HTTP endpoint to return binary content is simpler using HTTP than REST APIs. no request validation, X-Ray support or private endpoints. HTTP APIs (announced in 2019) are simpler, cheaper and faster than the older-style REST APIs, but with a restricted set of features, e.g. bind( buffers))īinary Content with HTTP APIs using AWS API GatewayĪWS’s API Gateway service supports two types of API endpoints - HTTP or REST APIs. Here is all the JavaScript you need to create this custom PDF.Ĭonst options = Ĭonst doc = new PDFDocument( options). pdfkit can create PDF files by reading HTML files. The library had a really simple API for generating PDFs from dynamic content. PDFkit is an open-source javascript library to generate PDF through server-side framework NodeJS. No native libraries to compile or external dependencies needed. It was a good choice for a serverless application for the following reasons: There are numerous Node.js libraries for generating PDFs including PDFKit, pdf-lib and HummusJS. Here’s how I did it… Creating custom PDF documents in Node.js I hadn’t previously built anything that generated PDFs dynamically (let alone using serverless) but discovered how easy this was to do on AWS Lambda using PDFKit and HTTP APIs with API Gateway. API responses had to include the document’s binary contents directly, rather than forwarding to an external storage service. PDFs would be accessed via a HTML link from an internal web-app. Custom PDFs needed to be created in real-time with dynamic content from an internal data source. I recently had this exact use-case on a client project. The package.How can you return dynamically generated PDF documents as HTTP responses from serverless functions? If everything goes well, there'll be a package.json file in your folder. Next, initialize it as a npm package so that you’ll be able to install all the necessary libraries you need. Project Setupįirst, you need to create a folder and navigate to it with the CLI: mkdir img2pdf You should know how to edit these files with a text editor. Sortablejs: This is a JavaScript drag-and-drop library that we'll use in the frontend for rearranging our images before they are converted to PDF.įinally, you must know how to create folders and files (with their appropriate extensions). Multer: This is a Node library that'll handle the file uploads. PDFkit: This is a JavaScript library that we'll use to convert the images to PDF. You should know the basics of this library. Jade/Pug: This is a JavaScript templating engine that'll help you render the address of the uploaded images in an HTML file. ![]() You should know about the configurations of this library. You should know how to create a basic Express application.Įxpress-session: This is an Express middleware library that'll help you manage the application sessions. Express-generator is a library that'll help you create the necessary files and folders for Express.js to run efficiently. It helps in restarting your server when you make changes to the project.Įxpress.js and express-generator: Express.js is the Node framework you’ll use to build the web server. Nodemon: Nodemon is an important Node package that’ll help you develop your project faster. Specifically, you must have a basic knowledge of how to import and use Nodejs built-in modules. NodeJS and npm: You need to have npm and Node.js installed because we'll use them for installing the necessary packages for your project. You should know about fundamental HTML elements, core CSS selectors, JavaScript concepts, and the DOM. You should know how to create these files and link them together. HTML, CSS, and JavaScript: You must have a basic knowledge of using HTML, CSS, and JavaScript to follow along with this tutorial. ![]() How to Sort the Images and Convert them to PDFīefore starting this project, you should have or know the following languages/libraries/frameworks:.In this tutorial, you'll learn how you can create your online image-to-pdf converter with HTML, CSS, JavaScript, and NodeJS. This tool is useful because it provides an efficient way to store your images. An online image-to-PDF converter is a website that helps you convert your images to PDFs.
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