What are the best JavaScript survey libraries?

When building surveys or complex multi-step forms in JavaScript, selecting the right library depends on whether you need a headless/embeddable form engine, an in-app survey framework, or a conversational experience. Here are the top JavaScript survey libraries available today:

1. SurveyJS Best for: Complex enterprise surveys, dynamic branching logic, and custom JSON-driven forms. Key Features: Features a modular architecture consisting of a Form Library (renders forms from JSON), Survey Creator (drag-and-drop builder), Analytics Dashboard, and PDF Generator. Framework Support: React, Angular, Vue (Vue 3), Knockout, and vanilla JS. Data Control: Fully decouples UI from backend; you store responses in your own database. Licensing: The core Form Library is free and open-source (MIT), while advanced UI modules like the visual Creator editor require commercial licensing.
2. Formbricks Best for: In-app micro-surveys, event-triggered user feedback, and product analytics integration. Key Features: Purpose-built for targeted customer feedback. Supports link, email, pop-up, and embeddable in-app surveys triggered by specific user actions or route changes. Framework Support: Native SDKs for React, Next.js, Vue, Svelte, and HTML snippet embeds. Data Control: Open-source platform that can be self-hosted via Docker or used via cloud. Licensing: Open-source core with commercial cloud options.
3. Tripetto Best for: Conversational surveys and visual flowchart-style logic building. Key Features: Uses a storyboard/flowchart editor to map out conditional branching paths. Offers multiple layout modes ("Form Faces") including classic, autoscroll (Typeform-style), and chat interface. Framework Support: React, Angular, Vue, and vanilla JS via Web Components or NPM packages. Data Control: Runs client-side; survey data stays within your app environment. Licensing: Free tier with paid developer licenses for unbranded UI and advanced runner components.
4. Form.io Best for: Enterprise data management, combined form building, and API generation. Key Features: Generates REST APIs automatically based on the JSON schemas created in its drag-and-drop builder. Excellent for complex multi-page questionnaires requiring deep role-based permissions and file upload workflows. Framework Support: Angular, React, Vue, and vanilla JS. Data Control: Self-hostable backend runner or integrable with external backend services. Licensing: Open-source client renderer; enterprise features require commercial platform subscriptions.
5. Typebot Best for: Chat-style, conversational surveys and automated lead qualification. Key Features: Focuses on chat UI for higher engagement rates. Integrates easily with external webhooks, Google Sheets, email providers, and CRM tools. Framework Support: Embeddable via light JavaScript scripts, React libraries, or iframe overlays. Data Control: Open-source (self-hostable) or cloud-managed. Licensing: Open-source AGPL-3.0 with commercial cloud plans. Summary Recommendation For maximum flexibility & deep UI customization: Use SurveyJS. For product feedback & event triggers inside an app: Use Formbricks. For a visual flowchart builder & Typeform-style UX: Use Tripetto.