---
title: "Form to JSON Schema"
description: "Reverse engineer HTML forms into JSON schema definitions. Paste any HTML form and extract field names, types, validation rules, and options into a reusable JSON format."
url: https://findutils.com/developers/form-to-json-schema/
category: developers
---

# Form to JSON Schema

Reverse engineer HTML forms into JSON schema definitions. Paste any HTML form and extract field names, types, validation rules, and options into a reusable JSON format.

**Use this tool:** [Form to JSON Schema](https://findutils.com/developers/form-to-json-schema/)

## Programmatic access

- REST id `form-to-json-schema`: POST https://api.findutils.com/api/tools/form-to-json-schema/execute (reference: https://findutils.com/api/form-to-json-schema/)
- MCP tool `form_to_json_schema` on https://mcp.findutils.com (reference: https://findutils.com/mcp/form-to-json-schema/)

## Why Use Form to JSON Schema?

Need to recreate an existing form in a different framework? This tool extracts the structure of any HTML form into a portable JSON schema that you can use with our JSON-to-form generators or your own code generation tools.

## Tips for Better Results

- Include the complete form tag with all child elements for the most accurate extraction.
- Make sure label elements use the for attribute so the tool can associate labels with their inputs.
- Wrap radio and checkbox groups inside a fieldset so the tool can detect related options.
- If your form uses custom web components, ensure the underlying native input elements are present in the HTML you paste.
- Use the extracted schema with the JSON Schema Form Builder to visually edit fields before generating code.

## Frequently Asked Questions

### What HTML elements are detected?

The tool extracts input, select, and textarea elements. It also detects associated labels and validation attributes like required, min, max, and pattern.

### Does it preserve all attributes?

The tool extracts the most commonly used form attributes including name, type, placeholder, required, and validation rules. Custom data attributes are not included.

### Can I use the output with your generators?

Yes! The JSON schema output is designed to be compatible with our JSON to HTML Form, Tailwind Form, Bootstrap Form, and React Form generators.

### How are radio buttons handled?

Radio buttons with the same name are grouped together with their individual options and labels extracted into an options array.

### What if the HTML is malformed?

The tool uses browser HTML parsing which is forgiving of minor errors. However, severely malformed HTML may not extract correctly.

### Does the tool require a signup?

No. Form to JSON Schema is available with no signup, no usage limits. Processing happens entirely in your browser so nothing is uploaded to any server.

### Does this tool support forms built with JavaScript frameworks?

The tool parses raw HTML, so it works with any framework output that renders standard HTML form elements. Copy the rendered HTML from your browser. DevTools for best results.

### Can I extract schemas from multiple forms on the same page?

Yes. If the HTML you paste contains more than one form element, the tool will detect and extract fields from all of them into a single combined schema.

### What JSON schema format does the tool produce?

The tool outputs a straightforward JSON object describing each field with its name, type, label, placeholder, and validation constraints. The format is designed for easy consumption by form generators and code generation tools.

### Is my HTML data safe?

Absolutely. All parsing happens client-side in your browser. No HTML is sent to any server, making this tool safe for proprietary and sensitive codebases.

## Related Tools

- [JSON to Form](https://findutils.com/developers/json-to-form/)
- [JSON Schema Form Builder](https://findutils.com/developers/json-schema-form-builder/)
- [JSON Schema Generator](https://findutils.com/developers/json-schema-generator/)
- [JSON Schema Validator](https://findutils.com/developers/json-schema-validator/)
- [JSON Formatter](https://findutils.com/developers/json-formatter/)