Pdf.mjs

PDF.js custom-compiled for nodeless, serverless enviroments, like Deno Deploy and Cloudflare Workers. Rocking in under 700kb uncompressed.

Usage

🦕 Deno

import { getDocument } from 'https://esm.sh/pdf.mjs'

const data = Deno.readFileSync('./file.pdf')
const doc = await getDocument(data).promise

console.log(await doc.getMetadata())

for (let i = 1; i <= doc.numPages; i++) {
    const page = await doc.getPage(i)
    const textContent = await page.getTextContent()
    const contents = textContent.items.map((item) => item.str).join(' ')
    console.log(contents)
}

⚡️ Cloudflare Workers

Installation

npm i pdf.mjs
# or
yarn add pdf.mjs

Compatibility flag

Make sure you enable the "streams_enable_constructors" compatibility flag in your wrangler.toml file:

compatibility_flags = [ "streams_enable_constructors" ]

Example

import { getDocument } from 'pdf.mjs'

export default {
    async fetch(request) {
        const url = new URL(request.url).searchParams.get('pdf')

        if(!url)
            return new Response('400: Bad request',{
                status: 400
            })

        // Fetch the pdf file, as binary
        const buff = await fetch(url).then(r => r.arrayBuffer())

        // Note: passing an url to getDocument is not supported on workers
        const doc = await getDocument(buff).promise

        const meta = await doc.getMetadata()
        const pages = []

        for (let i = 1; i <= doc.numPages; i++) {
            const page = await doc.getPage(i)
            const textContent = await page.getTextContent()
            const contents = textContent.items.map((item) => item.str).join(' ')
            pages.push(contents)
        }

        return new Response(JSON.stringify({
            meta,
            pages
        }, null, 2), {
            headers: {
                'Content-Type': 'application/json'
            }
        })
    }
}

How?

Two things:

• By removing all polyfills, & some rendering logic bundled into PDF.js
• Using an older version of PDF.js (v2.0.943), without XFA form support, saving about 300kb