Integration • JavaScript and TypeScript

Node.js PDF API

Connect PrefillPDF to Next.js, Express, NestJS, serverless functions, queues, and TypeScript applications.

Extract JSON from PDF · PDF Template API · Documentation

Node.js applications can call PrefillPDF from server routes, backend services, workers, and serverless functions.

Use structured JSON to generate a completed document, or send an existing PDF and continue with extracted JSON in your application.

Common Node.js workflows

Next.js API route

Receive form or database data, call PrefillPDF on the server, and return a PDF response or URL.

Upload and extract

Accept an uploaded PDF, send it for extraction, and store the normalized fields in your application.

Queue-based generation

Generate documents through background jobs to support larger workloads and retries.

How the integration works

Create a server-side request

Keep API credentials on the server and call PrefillPDF with fetch, Axios, or another HTTP client.

Send document input

Use JSON for generation or file/multipart input for extraction.

Handle the result

Parse JSON responses, stream files, or save the result to object storage.

Add retries and logging

Track failed jobs and retry transient errors in production workflows.

Node.js request example

const response = await fetch("https://api.prefillpdf.com/fill-pdf", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.PREFILLPDF_API_KEY}`,
    "Content-Type": "application/json",
    Accept: "application/json",
  },
  body: JSON.stringify({
    template_id: "your-template-id",
    data: {
      customer_name: "Jane Smith",
      amount: 25000,
    },
  }),
});

if (!response.ok) {
  throw new Error(`PrefillPDF request failed: ${response.status}`);
}

const result = await response.json();