oneOf, anyOf, and allOf

react-jsonschema-form supports custom widgets for oneOf, anyOf, and allOf.

• A schema with oneOf is valid if exactly one of the subschemas is valid.
• A schema with anyOf is valid if at least one of the subschemas is valid.
• A schema with allOf is valid if all of the subschemas are valid.

oneOf

import { RJSFSchema } from '@rjsf/utils';
import validator from '@rjsf/validator-ajv8';

const schema: RJSFSchema = {
  type: 'object',
  oneOf: [
    {
      properties: {
        lorem: {
          type: 'string',
        },
      },
      required: ['lorem'],
    },
    {
      properties: {
        ipsum: {
          type: 'string',
        },
      },
      required: ['ipsum'],
    },
  ],
};

render(<Form schema={schema} validator={validator} />, document.getElementById('app'));

anyOf

import { RJSFSchema } from '@rjsf/utils';
import validator from '@rjsf/validator-ajv8';

const schema: RJSFSchema = {
  type: 'object',
  anyOf: [
    {
      properties: {
        lorem: {
          type: 'string',
        },
      },
      required: ['lorem'],
    },
    {
      properties: {
        lorem: {
          type: 'string',
        },
        ipsum: {
          type: 'string',
        },
      },
    },
  ],
};

render(<Form schema={schema} validator={validator} />, document.getElementById('app'));

allOf

When allOf is specified in a schema, react-jsonschema-form uses the json-schema-merge-allof library to merge the specified subschemas to create a combined subschema that is valid. For example, the below schema evaluates to a combined subschema of {type: "boolean"}:

import { RJSFSchema } from '@rjsf/utils';
import validator from '@rjsf/validator-ajv8';

const schema: RJSFSchema = {
  title: 'Field',
  allOf: [
    {
      type: ['string', 'boolean'],
    },
    {
      type: 'boolean',
    },
  ],
};

render(<Form schema={schema} validator={validator} />, document.getElementById('app'));