Dastavej Core, for developers

Merge PDFs

import { mergePdfs } from 'dastavej';

const merged = await mergePdfs([bytesA, bytesB, bytesC]);

Compress

import { compressPdf } from 'dastavej';

const { bytes, imagesRecompressed } = await compressPdf(pdfBytes, {
  quality: 0.6,
  maxDimension: 1600,
  onProgress: (done, total) => console.log(`${done}/${total}`),
});

Build a fillable form

import { buildFormPdf, FORM_TEMPLATES } from 'dastavej';

const template = FORM_TEMPLATES.find((t) => t.id === 'job-application')!;
const pdf = await buildFormPdf({
  title: template.title,
  fields: template.fields.map((f) => ({ ...f, id: crypto.randomUUID() })),
  pageSize: 'A4',
  orientation: 'portrait',
  photoBox: template.photoBox,
});

Convert to Word

import { openForConversion, convertToWord } from 'dastavej';

const doc = await openForConversion(pdfBytes);
const docxBytes = await convertToWord(doc, (p) => console.log(p));

Collect filled forms into Excel

import { extractFormData, exportRowsToXlsx } from 'dastavej';

const rows = await Promise.all(
  files.map((f) => f.arrayBuffer().then((buf) => extractFormData(f.name, new Uint8Array(buf)))),
);
await exportRowsToXlsx(rows, 'responses.xlsx');

OCR a scanned PDF

import { ocrPdfBytes } from 'dastavej';

const results = await ocrPdfBytes(pdfBytes, (p) => console.log(p.phase, p.progress), {
  enhance: true, // grayscale + auto-threshold for faded scans
});
console.log(results.map((r) => r.text).join('\n\n'));