I Stopped Fighting PDF Libraries

In the world of software development, every project eventually comes across the challenge of handling PDF documents. Whether it's for receipts, certificates, reports, or any other purpose, PDFs can be tricky to work with. This is especially true when it comes to rendering dynamic data within PDF templates.

The author of this story faced this very issue while building a Flask backend for running tech workshops. Participants register, pay, attend, and receive a certificate at the end. This requires four different documents: a receipt for registration, a certificate for each attendee (often 80+ at once), an invoice for sponsors, and a post-event report for the organizer.

To tackle this challenge, the author decided to use pdfs.build, a service that simplifies the process of generating PDFs. The key idea behind pdfs.build is to design templates with dynamic variables, and then call a REST endpoint with a template ID and a JSON payload. The service then returns a rendered PDF, averaging under 400ms per render.

What sets pdfs.build apart is its separation of templates and code. This means that if the certificate design needs to change next month, the Flask app doesn't need to be touched. Each template is associated with a JSON schema that defines the variables it expects. This allows for easy testing of the templates with sample data before integrating them into the backend.

The author found the process of building templates to be surprisingly efficient. They started with pre-designed templates from pdfs.build's gallery, customizing them as needed. The AI chat editor allowed for quick changes to the template, with real-time previews. This eliminated the need for a lengthy compile-wait-check loop.

One of the author's favorite features was the version control built into the templates. Every edit is tracked, allowing for side-by-side comparison and easy rollback if needed. This made it simple to test different variations of templates, such as a two-language version of the certificate, without affecting the production version.

The backend integration with pdfs.build was straightforward. The author provided a simple helper function to render a PDF, sending a POST request to the pdfs.build API with the template ID and the JSON data. This integration was done within a single helper function, allowing the Flask app to remain focused on its core functionality.

The registration endpoint, which sends a PDF receipt back to the user, demonstrates how easy it is to integrate pdfs.build into an existing Flask application. By calling the render_pdf helper function with the appropriate template ID and data, the app can generate and return a PDF receipt to the user.

Overall, the author's experience with pdfs.build highlights the benefits of using a dedicated service for generating PDFs. By separating templates and code, providing a user-friendly interface for designing and customizing templates, and offering version control, pdfs.build streamlines the process of handling PDF documents in web applications.