·5 min read
3 ways to generate PDFs in Node.js (and when to use each)
Puppeteer/Playwright, pdfkit/pdf-lib, or a hosted PDF API — a practical comparison of fidelity, ops burden, and serverless pain for generating PDFs from Node.js.
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Practical guides on generating PDFs from code and AI agents — serverless Chromium, HTML-to-PDF, document automation, and the MCP wedge.
·6 min read
Why serverless Chromium is so painful on Vercel and Lambda
Running headless Chromium in a serverless function fails in ways that are hard to debug: bundle-size limits, cold starts, missing system libraries, and timeouts. Here's why, and the simplest way around it.
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Per-page vs per-document PDF API pricing: which costs less?
A worked comparison of per-page and per-document PDF API pricing, with the exact page-count crossover where one model beats the other.
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How to let an AI agent generate PDFs with MCP
Give any MCP-compatible agent a generate_pdf tool in one line, npx @docweave/mcp, and see why that beats wiring up raw HTTP calls for PDF generation.
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Puppeteer vs Playwright vs a PDF API for HTML-to-PDF
An honest comparison of self-hosting Puppeteer or Playwright versus calling a hosted PDF API — same rendering engine, very different operational cost.
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How to generate an invoice PDF from JSON (with a template)
A step-by-step guide to building an HTML invoice template with placeholders, sending it template + JSON to Docweave's PDF API, and avoiding duplicate invoices with idempotency keys.
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How to avoid duplicate PDFs (and double-billing) with idempotency keys
How Docweave's idempotencyKey stops retries and webhook re-deliveries from generating duplicate PDFs or charging you twice for the same document.
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HTML-to-PDF done right: page breaks, headers, footers, and margins
A practical guide to CSS @page rules, break-inside, and header/footer templates for clean, correctly-paginated PDFs from Chromium.
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How to generate PDFs from a no-code tool (Zapier, Make, n8n)
A tool-by-tool guide to generating PDFs from Zapier, Make, and n8n using the same underlying HTTP request to Docweave's API.
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How to generate a certificate PDF from a template
A step-by-step guide to building an HTML certificate template with placeholders and rendering it to a polished PDF via the Docweave API.
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Generating PDFs at scale: batching, concurrency, and idempotency
How to run high-volume PDF generation safely — concurrency limits, retries with idempotencyKey, failure handling, and why per-document pricing changes the math at scale.
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How to add headers, footers, and page numbers to an HTML-to-PDF
Why @page CSS doesn't give you running headers in Chromium-rendered PDFs, and how to use headerTemplate/footerTemplate to add page numbers, titles, and dates correctly.
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URL to PDF: how to snapshot a web page as a PDF via API
How Docweave's url source type renders a live web page to PDF, when to use it instead of raw HTML, and the auth/SSRF caveats that trip people up.
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How to embed images, logos, and custom fonts in a generated PDF
A practical guide to getting images, logos, and web fonts to render correctly in generated PDFs — data URIs vs hosted assets, @font-face gotchas, and how Docweave's Chromium renderer handles both.
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How to generate PDFs from database rows with a reusable template
The pattern for turning database rows into PDFs at scale: query, map to template data, render with a per-row idempotency key, store the result.
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Webhook-safe PDF generation: idempotency for Stripe and queue retries
Why webhooks and job queues redeliver the same event, how that causes duplicate PDFs and double-billing, and how to use idempotencyKey to make PDF generation safe to retry.
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Markdown to PDF: converting docs and READMEs to PDF via an API
How to turn markdown files (READMEs, docs, changelogs) into PDFs programmatically: convert to HTML with a markdown library, then send that HTML to a PDF API. Includes a working Node example.
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