pdf-split.js

const fs = require('fs-extra')
const path = require('path')
const chalk = require('chalk')
const scissors = require('scissors')

const INPUT_FOLDER = './input/'
const OUTPUT_FOLDER = './output/'

fs.readdirSync(INPUT_FOLDER).forEach(fileName => {
    let pdf = scissors(path.join(INPUT_FOLDER, fileName))
    pdf.getNumPages().then((numPages) => {

        let outputSubdir = path.join(OUTPUT_FOLDER, path.basename(fileName, '.pdf'))
        
        fs.ensureDir(outputSubdir, err => {
            console.log('Created', outputSubdir)
        })

        for (let i = 1 ; i < numPages ; i +=2) {
            let pdfread = scissors(path.join(INPUT_FOLDER, fileName))
            
            let startPage = i
            let endPage = startPage+1

            let outputSlice = path.join(outputSubdir , `${startPage}-${endPage}.pdf`)

            pdfread.pages(startPage, endPage)
                .pdfStream()
                .pipe(
                    fs.createWriteStream(outputSlice)
                )
                .on('finish', () => {
                    console.log(chalk.green('DONE'))
                })
                .on('error', () => {
                    console.log(chalk.red('FAIL'))
                })
        }
    })
})