How do I turn a JSON Schema into a fillable form?

In Schema to Form mode, paste an object schema with a properties map into the JSON Schema box. Each property becomes a field, and the Form output (JSON) updates as you type. Click Copy or Download to take the result.

Which field types and validation rules does the form support?

It renders string, number, integer, boolean, enum and arrays of strings. It checks required, minimum, maximum, whole numbers, email format, pattern and enum values. Copy and Download are blocked until every field passes.

Why do I see the error Schema must be an object with a properties map?

The tool needs a top-level object schema that contains a properties map. A bare type, array root or schema without properties is rejected. Wrap your fields in properties, or fix the Invalid JSON error first.

Can I generate a JSON Schema from an existing JSON sample?

Yes. Switch to JSON to Schema mode and paste your JSON. An Inferred JSON Schema appears, detecting email, date and URI strings. Click Use as schema to load it into the form, or Copy to take it.

How do I enter a list of values like tags in the generated form?

Array fields appear as a single text box labelled comma-separated. Type values such as a, b, c and they become an array in the output JSON. This works for arrays of strings only.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

📋

Free JSON Schema to Form

Paste a JSON Schema and get a live, working form — text, number, checkbox, dropdown, and list fields — then copy the JSON your inputs produce. Great for prototyping API request bodies. Runs in your browser.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever

Works offline once loaded

JSON Schema

User Profile

Full name *

Email *

Age

role

Subscribe to newsletter

Tags (comma-separated)

Form output (JSON)

{
  "role": "viewer",
  "newsletter": true
}

Renders the common top-level field types (string, number, integer, boolean, enum, and arrays of strings). Great for quickly prototyping a form from an API schema. Runs entirely in your browser.

How It Works

Turns a JSON Schema into a working form, then shows the JSON your inputs produce — handy for prototyping an API request body or config from its schema.

1
Paste a JSON Schema
An object schema with a "properties" map. Titles, defaults, enums, formats, and required fields are all respected.
2
Fill in the generated form
Each property renders as the right control — text, number, checkbox, dropdown, or comma-separated list — with required fields marked.
3
Copy the resulting JSON
The output JSON updates live as you type, ready to paste into an API client or config file.

Your schema and inputs stay in your browser — nothing is uploaded.

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