makejson.online

Convert documents into structured JSON using the AI provider of your choice.

It runs entirely in your browser. There is no backend: your files are parsed locally in the tab, and the extracted text goes straight from your browser to the AI provider using your own API key. Nothing is uploaded to makejson.online, because makejson.online has nowhere to upload it to.

Features

• Bring your own key — OpenAI, Anthropic, Google Gemini, or OpenRouter
  • OpenAI gpt-4o-mini
  • Anthropic claude-3-5-haiku-latest
  • Google gemini-2.0-flash
  • OpenRouter (pick a model, e.g. openai/gpt-4o-mini or anthropic/claude-sonnet-4)
• Wide file format support
  • Documents: PDF, DOCX, TXT, CSV, XLSX
  • Code: JS/TS, HTML, CSS, PHP, SQL, Python, JSON, XML, MD
  • Archives: ZIP (every readable file inside is processed)
• Local processing
  • PDF text via pdf.js, DOCX via mammoth, spreadsheets via SheetJS, archives via JSZip
  • Large documents are chunked before being sent to the model
  • macOS/editor cruft (__MACOSX, .DS_Store) is filtered out of archives

Privacy

• Your API key lives in sessionStorage and is cleared when you close the tab.
• File contents never touch a server owned by this project.
• The only outbound request is the one your browser makes to your chosen AI provider.

That said: the extracted text is sent to that provider under your own account, so their terms and data policies apply. Don't feed it anything you wouldn't paste into their console yourself.

Running locally

npm install
npm run dev      # http://localhost:5173

Build a production bundle:

npm run build    # static files land in dist/
npm run preview

dist/ is a plain static site — host it anywhere that serves files.

Deploying

The build uses a relative base path and hash-based routing, so the same dist/ works whether it is served from a domain root or a subdirectory, with no server rewrite rules required.

Tech stack

React 18, TypeScript, Vite, Tailwind CSS, shadcn/ui, wouter.

Version 2 removed the Express server, the Postgres/Drizzle setup and the SMTP contact form that the original Replit build depended on. None of them were needed for the tool to do its job, and all of them were things that could break. Design tokens that used to be generated from theme.json by a Replit-only Vite plugin are now checked into client/src/index.css.

Contributing

Issues and pull requests welcome at github.com/kr3t3n/makejson.

License

MIT — see LICENSE.

Support

Like makejson.online? Buy me a coffee ☕

Created by Georgi · part of aithings.online