Docling Core

TypeScript definitions and functions for using Docling output, which simplifies document processing, parsing diverse formats — including advanced PDF understanding. This package supports integrating Docling output into your Type-/JavaScript app with type definitions and utility functions that reflect the Docling Core Python library.

Getting started

Install package

npm i @docling/docling-core

Convert and fetch

To convert a document you can:

• Use a separate document conversion service, such as docling-serve.
• Integrate Docling into your own API, or use the Docling CLI for a quick web service example.
• Pre-convert documents and host these as static resources, on a COS bucket for example.

Next, fetch the (typed) conversion:

import { type DoclingDocument } from '@docling/docling-core';

async function fetchConversion(url: string) {
  const response = await fetch(url);

  return (await response.json()) as DoclingDocument;
}

Iterate and discriminate

Use the utility and typing functions for easy access to the converted document contents:

import { iterateDocumentItems, isDocling } from '@docling/docling-core';

for (const [item, level] of iterateDocumentItems(conversion)) {
  if (isDocling.TextItem(item)) {
    console.log(item.text);
  } else if (isDocling.TableItem(item)) {
    ...
  }
}

Limitations

This package does not

• Convert documents directly from within a JavaScript runtime. It is not a port of Docling.
• Support Docling output formats other than JSON, such as Markdown.

Develop

This package is tied to a specific version of the docling document format. Upgrade to a newer version of the document format:

• In package.json set config.docling to the target version. For example, "docling": "v23.3.0"
• Generate the corresponding types: npm run generate