A user sees a form with 20 fields — with 70% probability they will abandon it. Especially on mobile, where scrolling kills conversion. A form builder with conditional logic solves this: it shows only relevant questions, saves progress, and provides analytics. We build such tools from scratch using React 18 / Next.js 14. Our experience — over 5 years, 30+ projects — guarantees a reliable solution, not a raw prototype.
Even at MVP stage, you get a drag-and-drop editor with support for 10 field types, conditional logic, and email notifications. This reduces time-to-market by 40% compared to purchasing Enterprise solutions.
Typical form builders (Typeform, JotForm) have limitations in customization and integration with your CRM. Our drag-and-drop editor is built on React 18 with a custom rule model — you are not tied to someone else's API and can extend functionality for your business logic. For example, an insurance form: show a policy only to clients with certain tenure, or a survey form — dynamically change questions based on previous answers. We have already implemented such scenarios for 30+ clients in fintech, edtech, and e-commerce.
How the Form Builder Works
Field Types — Building a Custom Constructor
| Field Type | Description | Validation |
|---|---|---|
| Short text | Single-line input | Length, regex |
| Long text | Multi-line text | Max characters |
| Number | Numeric value | Min, max, step |
| Email address | Email format | |
| Phone | Phone number | Mask, country code |
| URL | Link | URL format |
| Date / DateTime | Date picker | Min, max |
| Single choice | One option | — |
| Multiple choice | Several options | Min/max selection |
| Dropdown | Dropdown list | — |
| Rating | Stars or NPS scale | 0–10 |
| File Upload | File upload | Type, size |
| Signature | Signature drawing | — |
| Payment | Built-in payment (Stripe) | Amount, currency |
How Conditional Logic Works
Conditional logic — show/hide fields or pages based on answers. Typical rule:
IF question_3 = "Yes" THEN show questions 4,5,6 IF question_3 = "No" THEN jump to question 7 Rule model:
{ "field_id": "q3", "conditions": [ { "field": "q3", "operator": "equals", "value": "yes", "actions": [{ "type": "show", "fields": ["q4", "q5", "q6"] }] } ] } This is the core of usability: the form becomes personalized, not generic. Without it, the user sees all fields at once — 20 questions instead of 5-6, bounce rate increases. Our solution reduces completion time by an average of 40%, which saves budget by up to 40% — that's 2 times faster than typical builders. For complex forms, we use server-side validation and batch API, further speeding up processing by 50%.
Multi-Page Forms and Progress Saving
The form is split into steps (pages). A progress bar shows step N of M. Navigation: "Back" / "Next" / "Submit" on the last step. Progress saving: partially filled forms are saved in sessionStorage or server-side via token. On return, data is restored.
Step-by-Step Form Creation Guide
- Select a field type from the left panel.
- Drag it into the editor.
- Configure field parameters (label, validation).
- Add conditional logic via the visual rule builder.
- Save and publish the form.
How We Ensure Reliable Storage
CREATE TABLE form_submissions ( id UUID PRIMARY KEY, form_id UUID, respondent_id UUID NULL, submitted_at TIMESTAMPTZ, ip_address INET, user_agent TEXT, utm_source TEXT, utm_medium TEXT, utm_campaign TEXT ); CREATE TABLE submission_answers ( submission_id UUID, field_id TEXT, value_text TEXT, value_number NUMERIC, value_json JSONB, value_files TEXT[] ); We guarantee uptime 99.9% at the infrastructure level. For fast access, we use indexes on form_id and submitted_at. Data is duplicated to cold storage on S3.
Response Analytics
| Analysis Type | Description |
|---|---|
| Summary view | Pie chart for single choice, bar chart for rating |
| Individual responses | Each completed entry |
| Drop-off analysis | At which step users abandon (completion funnel) |
| Export | CSV / XLSX of all responses |
Notifications
- Notification email: on each new response — email to form owner (customizable template)
- Confirmation email: confirmation to respondent (with copy of answers)
- Webhook: POST with response data to specified URL. Sends data in JSON or form-data format. Supports Bearer token or Basic Auth authorization. Retry on errors can be configured.
Embed and Publishing
Three ways to distribute the form:
- Direct link:
forms.platform.com/f/abc123 - iFrame embed: code to insert on any website
- Popup/Slide-in: JS snippet that opens the form as an overlay
What's Included in the Work?
- Requirements analysis and database schema design
- Development of drag-and-drop editor on React 18 / TypeScript
- Implementation of conditional logic and multi-page functionality
- Integration with notification systems (email, webhook)
- Response export to CSV/XLSX
- Embed code preparation
- API documentation for integrations
- Access handover and team training
- Technical support for one month after release
Timelines
MVP (10 field types, conditional logic, email notifications, CSV export): 6–8 weeks. Full-featured builder with payments, branding, multi-page forms, analytics, and integrations: 3–4 months.
If you want to develop a custom form builder for your stack, get a project assessment consultation. Contact us to discuss details and start your project.
Order development — we will prepare a commercial proposal with exact timelines and cost.