Build, embed, and run documents natively in your product
Trusted by leading products
We've built it so you don't have to
An entire engine built for developers to achieve any document scenario inside web and mobile projects.
UI
An easy user interface to build custom documents. Drag-and-drop simplicity to full design and layout control.
Validation
Ensure accurate, complete input with automatic document field validation for required values.
Conditional logic
Create smart, dynamic documents that adapt to user input using simple if/then and show/hide conditions.
Formulas
Perform real-time calculations directly in the documents, from basic math to advanced expressions.
Theming
Easily match your brand with full control over colors, fonts, and layout—right from your configuration.
Template engine
An template library that enable users to build, manage, and save reusable account-level templates.
i18n
Localize your documents. Built-in support for multiple languages and regional formatting.
Data control
Connect your documents to live data sources and auto-fill without writing custom logic.
Common document use cases
A new document standard for builders and their agents
Natively embeddable
White-labeled and custom branded, running directly inside your product—no iframes or redirects.
Extensible
Build custom fields, logic, UI, and workflows to support any unique product edge case or requirements.
JSON-based
Everything is defined as structured data. From data to design to logic—unified in JSON. Zero translation overhead.
Platform-native
One definition that renders UI and experiences natively across web, iOS, and Android apps.
Agent-ready
Designed for autonomous agents to generate, fill, and automate workflows using a structured, readable system.
Web-native
Built on proven web standards like React, HTML, and CSS—familiar to developers and instinctual for AI agents.
Model-agnostic
Built to work with GPT, Claude, and whatever comes next. Switch between models without refactoring your data.
Questions? We have answers.
What is J0y?
What is the .joy specification?
Which frameworks does J0y support for documents?
Can I customize and white-label the UI to match my product?
How is J0y different from other document developer tools?
Does one .joy definition render documents across web, iOS, and Android?
Can I embed documents inside my own product natively?
How do AI agents work with documents?
Is J0y an AI model?
Is J0y open source, and can I self-host it?
What if J0y doesn't support something I need out of the box?
Can I use J0y with my existing document solution?