extract.js

var fs = require('fs');
var path = require('path');
var OpenCC = require('opencc');

// Load the default Simplified to Traditional config
var opencc = new OpenCC('t2s.json');
// Sync API
var converted = opencc.convertSync("漢字");
console.log(converted);

const dir = './8167-[国民经济学原理].(奥)卡尔·门格尔.扫描版.pdf/'

fs.readdirSync(dir).forEach(base => {
    var p = path.parse(base)
    if (p.ext === '.json') {
        var ocr = JSON.parse(fs.readFileSync(dir + base))
        console.log(ocr)
        try {
            var content = ocr['responses'][0]['fullTextAnnotation']['text'].replace(/(.{20,})\n/g, '$1')
            fs.writeFileSync(dir + p.name + '.txt', opencc.convertSync(content))
        } catch (e) {
            console.log(e)
        }
        
    }  
})