How can I generate forms from JSON schema?

You can generate forms from JSON Schema by using a schema-driven form renderer: the schema describes the fields, and a form library turns that schema into inputs, validation, and submission handling.

Common approaches

1) Use a library that already supports JSON Schema

Popular options:

• React JSON Schema Form (RJSF) for React
• Uniforms for React
• Angular Formly with schema adapters
• Vue JSON Schema Form or similar Vue-based libraries
• Formik + custom renderer if you want full control

2) Build your own renderer

You parse the schema and map:

• type: "string" → text input
• type: "number" / integer → numeric input
• type: "boolean" → checkbox
• enum → select/radio
• format: "date" → date picker
• properties → nested object sections
• items → repeating array fields

Example JSON Schema

{
  "type": "object",
  "properties": {
    "name": { "type": "string", "title": "Full Name" },
    "age": { "type": "integer", "title": "Age" },
    "newsletter": { "type": "boolean", "title": "Subscribe?" },
    "role": {
      "type": "string",
      "enum": ["user", "admin"],
      "title": "Role"
    }
  },
  "required": ["name", "age"]
}

This could render as:

• Name → text field
• Age → number field
• Subscribe? → checkbox
• Role → dropdown

If you’re using React

A quick path is RJSF:

npm install @rjsf/core @rjsf/validator-ajv8

import Form from "@rjsf/core";
import validator from "@rjsf/validator-ajv8";

const schema = {
  type: "object",
  properties: {
    name: { type: "string", title: "Full Name" },
    age: { type: "integer", title: "Age" }
  },
  required: ["name"]
};

export default function App() {
  return (
    <Form
      schema={schema}
      validator={validator}
      onSubmit={({ formData }) => console.log(formData)}
    />
  );
}

Important features to handle

If you build or choose a library, check support for:

• nested objects
• arrays / repeating fields
• validation (required, minLength, pattern, minimum, etc.)
• custom widgets
• conditional fields (if/then/else, oneOf, anyOf)
• UI hints via title, description, default, and uiSchema

Best practice

Keep:

• JSON Schema for data/validation
• UI schema for presentation details

That way, you can reuse the same schema for APIs, validation, and form generation.

If you want, I can show:

1. a React example,
2. a plain JavaScript form generator, or
3. how to handle nested objects and arrays.