KACO RegEx & JSON Schema Generator – Build Patterns and Schemas Without the Syntax Headache

Description

Writing RegEx by hand is slow and error-prone. Mapping out a JSON Schema field by field is tedious and easy to get wrong. The KACO RegEx and JSON Schema Generator does both in seconds – describe what you need in plain English, or paste your sample data, and get a working, ready-to-deploy result immediately.

Two powerful tools in one. No installation. No subscription. Runs offline in your browser with your own API key.

What You Get

• One AI tool that runs entirely offline in your browser – no installation, no account, no setup
• RegEx Generator: describe your pattern in plain English and get a working regex instantly
• Four preset targets: Email Addresses, Phone Numbers, Dates, URLs
• Custom mode: describe any pattern – UK postcodes, SKU codes, hex colours, ISBNs, anything
• Output in JavaScript, Python, PHP, or Generic (PCRE)
• Plain English explanation of every pattern generated
• Test matches shown against your pasted sample text
• JSON Schema Generator: paste sample JSON and get a valid schema in seconds
• Supports JSON Schema Draft 07 and Draft 2020-12
• Flexible or Strict mode for additionalProperties handling
• Schema notes explaining the AI decisions made
• Individual Copy buttons for pattern, explanation, matches, and schema
• Powered by OpenAI gpt-4o with your own API key – no subscription, no middleman
• Copy Prompt button for use with Claude or Gemini instead
• Light and dark theme, remembered between sessions
• How to Use PDF guide included

Who It Is For

Developers who need a quick, correct regex without debugging syntax for an hour. Tech-adjacent professionals who work with data but are not RegEx experts. API builders who need to write or validate JSON Schemas for their endpoints. Anyone who regularly does data extraction, form validation, or schema mapping and wants to stop doing it by hand.

How It Works – RegEx Mode

1. Open the app in your browser and add your OpenAI API key in Settings
2. Select the RegEx Generator tab
3. Paste sample text or describe what you need to match
4. Pick your target type and output language
5. Click Generate RegEx – get your pattern, explanation, and test matches

How It Works – JSON Schema Mode

1. Select the JSON Schema Generator tab
2. Paste your sample JSON object or array
3. Choose Draft 07 or 2020-12, and Flexible or Strict mode
4. Click Generate Schema – get your complete JSON Schema and notes

No subscription. No cloud account. No data stored anywhere. Pay once, own it forever.

Licence

Personal and commercial use. One licence per purchaser. Not for resale or redistribution.