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JSON Form Schema JSON Example

A JSON-driven form definition schema for dynamically rendering forms from configuration — covering field types, validation rules, conditional logic, and select options. Used in headless CMS, no-code builders, and dynamic UI systems.

{
  "id": "contact-form-v2",
  "title": "Contact Us",
  "description": "Send us a message and we'll get back within 24 hours.",
  "submitLabel": "Send Message",
  "successMessage": "Thanks! We'll reply within one business day.",
  "fields": [
    {
      "name": "fullName",
      "type": "text",
      "label": "Full Name",
      "placeholder": "Ravi Mehta",
      "required": true,
      "maxLength": 100
    },
    {
      "name": "email",
      "type": "email",
      "label": "Email Address",
      "placeholder": "ravi@example.com",
      "required": true,
      "validation": {
        "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$",
        "message": "Enter a valid email address"
      }
    },
    {
      "name": "subject",
      "type": "select",
      "label": "Subject",
      "required": true,
      "options": [
        {
          "value": "support",
          "label": "Technical Support"
        },
        {
          "value": "billing",
          "label": "Billing"
        },
        {
          "value": "partnership",
          "label": "Partnership"
        },
        {
          "value": "other",
          "label": "Other"
        }
      ]
    },
    {
      "name": "message",
      "type": "textarea",
      "label": "Message",
      "placeholder": "Describe your question or issue...",
      "required": true,
      "minLength": 20,
      "maxLength": 2000,
      "rows": 5
    },
    {
      "name": "newsletter",
      "type": "checkbox",
      "label": "Subscribe to our developer newsletter",
      "required": false,
      "defaultValue": false
    }
  ]
}

Field Reference

idrequiredstringUnique form identifier — used for analytics and version tracking.
fields[].namerequiredstringField identifier — used as the key in the submitted form data object.
fields[].typerequiredstringInput type: text, email, password, number, textarea, select, checkbox, radio, date.
fields[].labelrequiredstringHuman-readable label shown above the input.
fields[].requiredrequiredbooleanWhether the field must be filled before submission.
fields[].validationoptionalobjectCustom validation rules: pattern (regex string) and message to show on failure.
fields[].optionsoptionalarrayFor select and radio types — array of { value, label } pairs.
fields[].defaultValueoptionalanyPre-filled value when the form first renders.
successMessageoptionalstringMessage shown to the user after successful form submission.

Variants

Multi-step formForm split into steps — common in onboarding and checkout flows
{
  "id": "onboarding-form-v1",
  "title": "Create Your Account",
  "steps": [
    {
      "step": 1,
      "title": "Personal Info",
      "fields": [
        {
          "name": "fullName",
          "type": "text",
          "label": "Full Name",
          "required": true
        },
        {
          "name": "email",
          "type": "email",
          "label": "Email",
          "required": true
        }
      ]
    },
    {
      "step": 2,
      "title": "Your Role",
      "fields": [
        {
          "name": "role",
          "type": "select",
          "label": "I am a...",
          "required": true,
          "options": [
            {
              "value": "developer",
              "label": "Developer"
            },
            {
              "value": "designer",
              "label": "Designer"
            },
            {
              "value": "manager",
              "label": "Product Manager"
            }
          ]
        }
      ]
    }
  ]
}

Common Use Cases

  • →Rendering forms dynamically from a CMS or database without code changes
  • →Building a no-code form builder where non-technical users design forms
  • →A/B testing different form layouts by switching the schema, not the code
  • →Generating server-side validation rules from the same JSON that drives the UI
  • →Creating reusable form components that work across multiple form configurations
form schemadynamic formsJSON Schemavalidationno-codeCMS

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Frequently Asked Questions

JSON Schema (jsonschema.org) defines the structure and validation rules for any JSON document. A JSON Form Schema (like this example) is a UI-specific schema that describes how to render a form — it includes UX fields like placeholder, label, rows, and successMessage that have no meaning in data validation.

Add a 'conditions' property to the field: { showIf: { field: 'subject', equals: 'other' } }. Your form renderer checks this condition on every change and shows/hides the field accordingly. Keep conditions simple — complex conditional logic is better handled in code than in JSON.

Map field names to values: { fullName: 'Ravi Mehta', email: 'ravi@example.com', subject: 'support', message: '...', newsletter: false }. The 'name' field in each field definition becomes the key. Validate this object against the schema on the server — never trust client-side-only validation.

Yes. Iterate over the fields array and render the appropriate input component based on the type field. Map validation.pattern to React Hook Form's validate or Formik's validate function. The schema drives which component to render; the form library handles state, submission, and error display.

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