Generate JSON Schema Draft 7 validation rules instantly in your browser. A free, user-friendly tool to build, structure, and export schema definitions for API data.
AI Generation Prompt
Technical Specification: JSON Schema Draft 7 Validation Rules Generator
1. Overview
A browser-based, client-side tool that allows developers to visually construct JSON Schema Draft 7 objects. The application provides a user-friendly interface to define object properties, types, constraints (min/max/pattern), and required fields, outputting a valid JSON Schema file.
2. Shared Constraints & Compliance
- Single File: All HTML, CSS, and JS must be inside one
.htmlfile. - Storage: No
localStorage,sessionStorage, orcookies. Use in-memory JavaScript variables. - Sandbox: The app will run in a null-origin iframe. Avoid
alert,prompt, orconfirm(use custom modals). - Design: Modern, light-mode, SaaS aesthetic. Avoid dark mode.
- Dependencies: Use CDNs for Tailwind CSS and an optional lightweight JSON formatter/highlighter (e.g., Prism.js).
3. UI Layout & Architecture
Header
- Clean, descriptive title: "JSON Schema Draft 7 Generator".
- A subtle "Clear" button to reset the current state (in-memory).
Main Workspace (Split-Pane View)
- Left Pane (Configuration):
- A form-based builder.
- Controls: Add property (input name, select type: string, number, object, array, boolean).
- Constraint inputs: Required checkbox, regex pattern input, minLength/maxLength, enum list.
- "Delete" buttons for existing properties.
- Right Pane (Preview):
- A read-only or live-updating code block showing the generated JSON Schema.
- Syntax highlighting via Prism.js.
- A persistent "Copy to Clipboard" button that uses the Clipboard API.
Footer (UI Element only, NOT a semantic footer)
- A status bar showing "Schema Valid" or "Schema Invalid" based on internal logic checks.
4. Color Palette & Aesthetics
- Background:
#ffffff(White) and#f9fafb(Gray-50 for structure). - Primary Actions:
#2563eb(Blue-600) with hover state#1d4ed8. - Text:
#111827(Gray-900) for headers,#374151(Gray-700) for bodies. - Borders:
#e5e7eb(Gray-200). - Shadows: Soft
shadow-smon inputs,shadow-mdon pane containers.
5. Implementation Directives
In-Memory State Management
- Define a global
stateobject variable:let schema = { type: 'object', properties: {}, required: [] };. - Every change in the UI triggers a function
updateSchema()which updates theschemavariable and re-renders the right-pane JSON display.
Form Logic
- Implement a recursive function to handle the object structure if nesting is supported.
- Use event delegation for dynamic "Delete" buttons to ensure responsiveness without memory leaks.
Animations & Interactions
- Use CSS transitions (
transition-all duration-200) for button hover states. - Smooth fade-in for newly added property rows.
- Instant visual feedback on the "Copy" action (e.g., button text changes to "Copied!" for 2 seconds).
6. SEO Implementation
- The page
<title>must match the generatedseo_title. - Use a standard meta description tag matching
seo_description. - Include appropriate
<h1>through<h3>tags to structure content for search crawlers.
Spread the word
Files being used
Frequently Asked Questions
Everything you need to know about using this application.
Why use JSON Schema Draft 7?
JSON Schema Draft 7 remains a highly compatible and stable standard for defining data structures in web APIs and microservices. It introduced powerful features like the 'if-then-else' conditional keywords, which allow for complex validation logic without needing custom backend code for every edge case. By utilizing Draft 7, developers ensure their data contracts are predictable and portable across different programming languages. It provides a robust set of constraints—such as regex pattern matching for strings, numeric ranges, and nested object requirements—that help maintain strict type safety and data integrity.
How does this tool handle browser storage?
This application is designed with strict security and privacy standards; it does not utilize browser storage mechanisms like localStorage, sessionStorage, or IndexedDB. All schema construction happens entirely within your browser's volatile memory. Since no data is persisted on your local disk or via cookies, your work is effectively cleared the moment the browser tab is closed or refreshed. This architecture makes it a secure option for prototyping schemas, as no sensitive data footprint is left behind on the host machine.
Can I use this for real-time validation?
Yes, this tool serves as an excellent foundation for your development workflow. While the app itself generates the schema definition, the exported JSON is standard-compliant and ready to be pasted into your backend application code, unit tests, or API documentation services. Once the schema is defined, you can use industry-standard libraries in languages like Node.js, Python, or Go to enforce these rules in real-time. This tool bridges the gap between conceptual data modeling and actual implementation, acting as your project's primary source of truth for validation requirements.
Does the app require an internet connection?
This application is a strictly client-side tool, meaning that once the initial page has finished loading, all processing occurs within your browser environment. It does not send your data to external servers or make network requests to process your schema. This offline-first approach ensures maximum performance and complete privacy. You can safely build and export your JSON schemas in secure, offline environments or on restricted networks without needing an active internet connection after the initial load.
