Forms Block

Dynamic form builder API with 20+ field types, validation, and workflows

The Forms Block provides a complete form building solution. Create unlimited forms with any combination of field types, validation rules, conditional logic, and submission workflows - all through a RESTful API.

Key Features

Dynamic Form Builder - Create forms programmatically with JSON configuration
20+ Field Types - Text, email, phone, date, file upload, signature, rating, and more
Validation Engine - Built-in validators with custom rule support
Conditional Logic - Show/hide fields based on user responses
Submission Workflows - Trigger webhooks, emails, and CRM integrations on submit
Multi-Page Forms - Build wizard-style forms with step navigation
Form Analytics - Track submissions, completion rates, and field drop-off
Real-time Webhooks - Instant notifications for form events

API Endpoint

Service	URL
Forms	`https://forms.api.us.23blocks.com`

Environment Routing: One URL, one environment. All shared-platform API keys are live keys:

pk_live_* / sk_live_* → your production tenant. Need a separate staging environment? It is available as a paid add-on on deployments in your own cloud account — see 23blocks in a Box.

Quick Start

Installation

npm install @23blocks/sdk

Basic Usage

import { create23BlocksClient } from '@23blocks/sdk';

const client = create23BlocksClient({
  urls: { forms: 'https://forms.api.us.23blocks.com' },
  apiKey: 'your-api-key',
});

// Create a contact form
const form = await client.forms.create({
  name: 'Contact Form',
  fields: [
    {
      type: 'text',
      name: 'full_name',
      label: 'Full Name',
      required: true
    },
    {
      type: 'email',
      name: 'email',
      label: 'Email Address',
      required: true,
      validators: ['email']
    },
    {
      type: 'textarea',
      name: 'message',
      label: 'Your Message',
      placeholder: 'How can we help?',
      maxLength: 1000
    }
  ]
});

// Submit form data
const submission = await client.forms.submit(form.id, {
  full_name: 'Jane Smith',
  email: 'jane@example.com',
  message: 'I would like to learn more about your API.'
});

Authentication

Required Headers

All API requests require authentication:

Authorization: Bearer [JWT_TOKEN]
X-API-Key: [COMPANY_API_KEY]
Content-Type: application/json

API Reference

Forms

Create Form

Create a new form with field definitions.

POST /api/v1/forms

Request Body:

{
  "data": {
    "type": "forms",
    "attributes": {
      "name": "Contact Form",
      "description": "Get in touch with our team",
      "slug": "contact",
      "status": "active",
      "settings": {
        "submit_button_text": "Send Message",
        "success_message": "Thank you! We'll be in touch soon.",
        "redirect_url": null,
        "collect_ip": true,
        "enable_captcha": true
      },
      "fields": [
        {
          "type": "text",
          "name": "full_name",
          "label": "Full Name",
          "required": true,
          "placeholder": "John Smith"
        },
        {
          "type": "email",
          "name": "email",
          "label": "Email Address",
          "required": true,
          "validators": ["email"]
        }
      ],
      "actions": [
        {
          "type": "webhook",
          "url": "https://api.example.com/leads",
          "method": "POST"
        },
        {
          "type": "email",
          "to": "team@company.com",
          "subject": "New Contact Form Submission"
        }
      ]
    }
  }
}

Response:

{
  "data": {
    "id": "form_xyz789",
    "type": "forms",
    "attributes": {
      "name": "Contact Form",
      "description": "Get in touch with our team",
      "slug": "contact",
      "status": "active",
      "fields": [...],
      "actions": [...],
      "settings": {...},
      "submission_count": 0,
      "created_at": "2025-01-15T10:30:00Z",
      "updated_at": "2025-01-15T10:30:00Z"
    }
  }
}

Get Form

Retrieve a form by ID.

GET /api/v1/forms/:id

Query Parameters:

Parameter	Type	Description
`include`	string	Related resources: `submissions,analytics`

List Forms

Retrieve a paginated list of forms.

GET /api/v1/forms

Query Parameters:

Parameter	Type	Description
`page[number]`	integer	Page number (default: 1)
`page[size]`	integer	Items per page (default: 25, max: 100)
`filter[status]`	string	Filter by status: `active`, `draft`, `archived`
`filter[slug]`	string	Filter by slug (exact match)
`sort`	string	Sort field: `created_at`, `-created_at`, `name`

Update Form

Update an existing form.

PATCH /api/v1/forms/:id

Delete Form

Delete a form (soft delete by default).

DELETE /api/v1/forms/:id

Duplicate Form

Create a copy of an existing form.

POST /api/v1/forms/:id/duplicate

Field Types

Forms Block supports 20+ field types:

Basic Fields

Type	Description	Options
`text`	Single-line text input	`placeholder`, `minLength`, `maxLength`, `pattern`
`textarea`	Multi-line text input	`placeholder`, `minLength`, `maxLength`, `rows`
`number`	Numeric input	`min`, `max`, `step`, `placeholder`
`email`	Email input with validation	`placeholder`
`phone`	Phone number input	`placeholder`, `format`
`url`	URL input with validation	`placeholder`
`password`	Password input	`minLength`, `requireUppercase`, `requireNumber`

Selection Fields

Type	Description	Options
`dropdown`	Single-select dropdown	`options`, `placeholder`
`multiselect`	Multi-select dropdown	`options`, `maxSelections`
`radio`	Radio button group	`options`, `layout`
`checkbox`	Checkbox group	`options`, `minSelections`, `maxSelections`
`boolean`	Single yes/no checkbox	`label`

Date & Time Fields

Type	Description	Options
`date`	Date picker	`minDate`, `maxDate`, `format`
`time`	Time picker	`minTime`, `maxTime`, `format`
`datetime`	Date and time picker	`minDateTime`, `maxDateTime`

Advanced Fields

Type	Description	Options
`file`	File upload	`accept`, `maxSize`, `maxFiles`
`signature`	Signature pad	`width`, `height`
`rating`	Star rating	`max`, `allowHalf`
`slider`	Range slider	`min`, `max`, `step`
`address`	Address autocomplete	`countries`, `types`
`richtext`	Rich text editor	`toolbar`, `maxLength`
`hidden`	Hidden field	`value`

Field Configuration Example

{
  "type": "file",
  "name": "resume",
  "label": "Upload Resume",
  "required": true,
  "options": {
    "accept": [".pdf", ".doc", ".docx"],
    "maxSize": 5242880,
    "maxFiles": 1
  },
  "helpText": "PDF or Word document, max 5MB"
}

Submissions

Submit Form

Submit data to a form.

POST /api/v1/forms/:form_id/submissions

Request Body:

{
  "data": {
    "type": "submissions",
    "attributes": {
      "values": {
        "full_name": "Jane Smith",
        "email": "jane@example.com",
        "message": "Hello!"
      },
      "metadata": {
        "source": "website",
        "utm_source": "google"
      }
    }
  }
}

Response:

{
  "data": {
    "id": "sub_abc123",
    "type": "submissions",
    "attributes": {
      "form_id": "form_xyz789",
      "values": {
        "full_name": "Jane Smith",
        "email": "jane@example.com",
        "message": "Hello!"
      },
      "metadata": {
        "source": "website",
        "utm_source": "google",
        "ip_address": "192.168.1.1",
        "user_agent": "Mozilla/5.0..."
      },
      "status": "completed",
      "created_at": "2025-01-15T14:30:00Z"
    }
  }
}

Get Submission

Retrieve a submission by ID.

GET /api/v1/submissions/:id

List Submissions

Get submissions for a form.

GET /api/v1/forms/:form_id/submissions

Query Parameters:

Parameter	Type	Description
`page[number]`	integer	Page number (default: 1)
`page[size]`	integer	Items per page (default: 25, max: 100)
`filter[status]`	string	Filter by status: `completed`, `partial`, `spam`
`filter[created_after]`	datetime	Filter by date range start
`filter[created_before]`	datetime	Filter by date range end
`sort`	string	Sort: `created_at`, `-created_at`

Export Submissions

Export submissions as CSV or JSON.

GET /api/v1/forms/:form_id/submissions/export

Query Parameters:

Parameter	Type	Description
`format`	string	Export format: `csv`, `json` (default: csv)
`filter[created_after]`	datetime	Filter by date range
`filter[created_before]`	datetime	Filter by date range

Delete Submission

Delete a submission.

DELETE /api/v1/submissions/:id

Validation

Built-in Validators

Validator	Description	Options
`required`	Field must have a value	-
`email`	Valid email format	-
`phone`	Valid phone format	`format`
`url`	Valid URL format	`protocols`
`minLength`	Minimum character count	`value`
`maxLength`	Maximum character count	`value`
`min`	Minimum numeric value	`value`
`max`	Maximum numeric value	`value`
`pattern`	Regex pattern match	`regex`, `message`

Custom Validation Rules

{
  "type": "text",
  "name": "company_email",
  "label": "Work Email",
  "validators": [
    "required",
    "email",
    {
      "type": "pattern",
      "regex": "^[a-zA-Z0-9._%+-]+@company\\.com$",
      "message": "Please use your company email address"
    }
  ]
}

Server-Side Validation

POST /api/v1/forms/:form_id/validate

Request Body:

{
  "values": {
    "email": "invalid-email",
    "full_name": ""
  }
}

Response:

{
  "valid": false,
  "errors": {
    "email": ["Please enter a valid email address"],
    "full_name": ["This field is required"]
  }
}

Conditional Logic

Show or hide fields based on user responses.

Condition Types

Type	Description
`equals`	Field value equals specified value
`not_equals`	Field value does not equal specified value
`contains`	Field value contains specified string
`greater_than`	Numeric value is greater than
`less_than`	Numeric value is less than
`is_empty`	Field has no value
`is_not_empty`	Field has a value

Configuration Example

{
  "fields": [
    {
      "type": "radio",
      "name": "contact_method",
      "label": "Preferred Contact Method",
      "options": [
        { "value": "email", "label": "Email" },
        { "value": "phone", "label": "Phone" }
      ]
    },
    {
      "type": "phone",
      "name": "phone_number",
      "label": "Phone Number",
      "conditions": {
        "show_when": {
          "field": "contact_method",
          "operator": "equals",
          "value": "phone"
        }
      }
    }
  ]
}

Multiple Conditions

{
  "conditions": {
    "show_when": {
      "logic": "and",
      "rules": [
        { "field": "country", "operator": "equals", "value": "US" },
        { "field": "age", "operator": "greater_than", "value": 18 }
      ]
    }
  }
}

Multi-Page Forms

Create wizard-style forms with multiple pages.

Configuration

{
  "name": "Application Form",
  "settings": {
    "multi_page": true,
    "show_progress": true,
    "allow_back_navigation": true
  },
  "pages": [
    {
      "title": "Personal Information",
      "fields": [
        { "type": "text", "name": "first_name", "label": "First Name" },
        { "type": "text", "name": "last_name", "label": "Last Name" }
      ]
    },
    {
      "title": "Contact Details",
      "fields": [
        { "type": "email", "name": "email", "label": "Email" },
        { "type": "phone", "name": "phone", "label": "Phone" }
      ]
    },
    {
      "title": "Review",
      "fields": [],
      "settings": {
        "show_summary": true
      }
    }
  ]
}

Save Progress

POST /api/v1/forms/:form_id/progress

Request Body:

{
  "session_id": "sess_abc123",
  "current_page": 2,
  "values": {
    "first_name": "Jane",
    "last_name": "Smith"
  }
}

Actions & Workflows

Available Actions

Action	Description
`webhook`	Send submission data to a URL
`email`	Send email notification
`crm`	Create CRM contact (via CRM Block)
`slack`	Post to Slack channel
`zapier`	Trigger Zapier webhook

Webhook Action

{
  "type": "webhook",
  "url": "https://api.example.com/leads",
  "method": "POST",
  "headers": {
    "Authorization": "Bearer {{secrets.api_key}}"
  },
  "payload_template": {
    "lead_name": "{{values.full_name}}",
    "lead_email": "{{values.email}}"
  }
}

Email Action

{
  "type": "email",
  "to": "{{values.email}}",
  "cc": ["team@company.com"],
  "subject": "Thank you for your submission",
  "template": "submission_confirmation",
  "variables": {
    "name": "{{values.full_name}}"
  }
}

CRM Integration

{
  "type": "crm",
  "action": "create_contact",
  "mapping": {
    "first_name": "{{values.first_name}}",
    "last_name": "{{values.last_name}}",
    "email": "{{values.email}}",
    "tags": ["website-lead"]
  }
}

Analytics

Get Form Analytics

GET /api/v1/forms/:form_id/analytics

Response:

{
  "data": {
    "form_id": "form_xyz789",
    "period": "last_30_days",
    "metrics": {
      "views": 5420,
      "starts": 2150,
      "completions": 1823,
      "completion_rate": 84.79,
      "average_time_seconds": 145,
      "submissions_by_day": [
        { "date": "2025-01-15", "count": 62 },
        { "date": "2025-01-14", "count": 58 }
      ]
    },
    "field_analytics": [
      {
        "field": "email",
        "drop_off_rate": 2.3,
        "average_time_seconds": 12
      },
      {
        "field": "message",
        "drop_off_rate": 8.5,
        "average_time_seconds": 45
      }
    ]
  }
}

Webhooks

Webhook Events

Event	Description
`form.created`	New form created
`form.updated`	Form updated
`form.deleted`	Form deleted
`submission.created`	New submission received
`submission.updated`	Submission updated
`submission.deleted`	Submission deleted

Create Webhook

POST /api/v1/webhooks

Request Body:

{
  "data": {
    "type": "webhooks",
    "attributes": {
      "url": "https://api.example.com/forms-webhook",
      "events": ["submission.created"],
      "form_id": "form_xyz789"
    }
  }
}

Webhook Payload

{
  "event": "submission.created",
  "timestamp": "2025-01-15T14:30:00Z",
  "data": {
    "submission_id": "sub_abc123",
    "form_id": "form_xyz789",
    "form_name": "Contact Form",
    "values": {
      "full_name": "Jane Smith",
      "email": "jane@example.com"
    }
  }
}

SDK Examples

TypeScript

import { create23BlocksClient } from '@23blocks/sdk';

const client = create23BlocksClient({
  urls: { forms: 'https://forms.api.us.23blocks.com' },
  apiKey: process.env.BLOCKS_API_KEY!,
});

// Create a survey form with conditional logic
async function createSurveyForm() {
  const form = await client.forms.create({
    name: 'Customer Satisfaction Survey',
    fields: [
      {
        type: 'rating',
        name: 'satisfaction',
        label: 'How satisfied are you?',
        required: true,
        options: { max: 5 }
      },
      {
        type: 'textarea',
        name: 'feedback',
        label: 'What could we improve?',
        conditions: {
          show_when: {
            field: 'satisfaction',
            operator: 'less_than',
            value: 4
          }
        }
      },
      {
        type: 'textarea',
        name: 'testimonial',
        label: 'Would you like to share a testimonial?',
        conditions: {
          show_when: {
            field: 'satisfaction',
            operator: 'greater_than',
            value: 3
          }
        }
      }
    ],
    actions: [
      {
        type: 'webhook',
        url: 'https://api.example.com/surveys'
      }
    ]
  });

  return form;
}

// Handle form submission with validation
async function submitForm(formId: string, data: Record<string, any>) {
  // Validate first
  const validation = await client.forms.validate(formId, data);

  if (!validation.valid) {
    throw new Error(`Validation failed: ${JSON.stringify(validation.errors)}`);
  }

  // Submit
  const submission = await client.forms.submit(formId, {
    values: data,
    metadata: {
      source: 'mobile-app',
      version: '2.1.0'
    }
  });

  return submission;
}

// Export submissions
async function exportSubmissions(formId: string, startDate: Date, endDate: Date) {
  const csv = await client.forms.exportSubmissions(formId, {
    format: 'csv',
    filter: {
      created_after: startDate.toISOString(),
      created_before: endDate.toISOString()
    }
  });

  return csv;
}

Error Codes

Code	Description
`FORMS001`	Form not found
`FORMS002`	Submission not found
`FORMS003`	Validation failed
`FORMS004`	File upload failed
`FORMS005`	File size exceeds limit
`FORMS006`	Invalid file type
`FORMS007`	Form is inactive
`FORMS008`	Submission limit reached
`FORMS009`	Duplicate submission detected

Rate Limits

Plan	Requests/minute	Forms	Submissions/month
Free	60	10	1,000
Starter	300	50	10,000
Pro	1,000	200	100,000
Enterprise	Custom	Unlimited	Unlimited

Marketing Page - Feature overview and pricing
Auth Block - Secure form submissions with authentication
CRM Block - Create contacts from form submissions
Files Block - Handle file uploads

Use This Block with AI Agents

This block ships an official Claude Code plugin from the public 23blocks marketplace (19 plugins, 205 skills). Your agent gets full working knowledge of this API — endpoints, identity registration, and conventions.

# one-time: add the 23blocks marketplace
claude plugin marketplace add https://github.com/23blocks-OS/ai-agents

# install this block's plugin
claude plugin install forms-block

Configure BLOCKS_API_URL, BLOCKS_API_KEY, and BLOCKS_AUTH_TOKEN. Register identity first: each block is autonomous — register the user with this block's identity endpoint before private calls (only user_unique_id is required; email/phone are optional notification-routing fields).

Full reference: AI Agents & Claude Code Plugins · github.com/23blocks-OS/ai-agents

Key Features​

API Endpoint​

Quick Start​

Installation​

Basic Usage​

Authentication​

Required Headers​

API Reference​

Forms​

Create Form​

Get Form​

List Forms​

Update Form​

Delete Form​

Duplicate Form​

Field Types​

Basic Fields​

Selection Fields​

Date & Time Fields​

Advanced Fields​

Field Configuration Example​

Submissions​

Submit Form​

Get Submission​

List Submissions​

Export Submissions​

Delete Submission​

Validation​

Built-in Validators​

Custom Validation Rules​

Server-Side Validation​

Conditional Logic​

Condition Types​

Configuration Example​

Multiple Conditions​

Multi-Page Forms​

Configuration​

Save Progress​

Actions & Workflows​

Available Actions​

Webhook Action​

Email Action​

CRM Integration​

Analytics​

Get Form Analytics​

Webhooks​

Webhook Events​

Create Webhook​

Webhook Payload​

SDK Examples​

TypeScript​

Error Codes​

Rate Limits​

Related Resources​

Use This Block with AI Agents​

Key Features

API Endpoint

Quick Start

Installation

Basic Usage

Authentication

Required Headers

API Reference

Forms

Create Form

Get Form

List Forms

Update Form

Delete Form

Duplicate Form

Field Types

Basic Fields

Selection Fields

Date & Time Fields

Advanced Fields

Field Configuration Example

Submissions

Submit Form

Get Submission

List Submissions

Export Submissions

Delete Submission

Validation

Built-in Validators

Custom Validation Rules

Server-Side Validation

Conditional Logic

Condition Types

Configuration Example

Multiple Conditions

Multi-Page Forms

Configuration

Save Progress

Actions & Workflows

Available Actions

Webhook Action

Email Action

CRM Integration

Analytics

Get Form Analytics

Webhooks

Webhook Events

Create Webhook

Webhook Payload

SDK Examples

TypeScript

Error Codes

Rate Limits

Related Resources

Use This Block with AI Agents