FAQ from Line0
What is Line0?
Line0 is a focused AI pair programmer built for Express.js backend development—designed to generate secure, scalable, and standards-compliant API services directly from natural language prompts. It combines deep framework knowledge with real-time collaboration features like GitHub sync, per-feature chat context, and prompt intelligence—all delivered through an intuitive in-browser interface.
How do I start building with Line0?
After authenticating and linking GitHub, simply type what your API should do—e.g., “Add JWT-authenticated /products CRUD endpoints backed by MongoDB.” Line0 scaffolds the project, writes idiomatic Express code, adds validation and error responses, generates Swagger-compatible docs, and commits everything to your repo. Use Tab to dynamically extend your request or Enhance to inject technical guardrails.
Why focus on backend APIs?
Because backend logic is where scalability, security, and correctness are decided—not deferred. Line0 eliminates weeks of repetitive setup, boilerplate, and configuration drift so teams can invest engineering time in business logic, not infrastructure glue.
Is it available for other frameworks and backend languages?
Express.js is our foundation—and our current priority—but official support for Fastify, NestJS, and Python-based backends (Flask/FastAPI) is actively in development and scheduled for phased rollout starting late 2025.
Can I build websites or mobile apps with Line0?
No. Line0 does not generate frontend UIs, React components, or native mobile code. However, its output is fully compatible with any frontend stack—you get clean, documented, CORS-enabled REST APIs ready for consumption by Next.js, Flutter, Swift, or any client.
Is it free?
Yes. The Free plan includes up to 50 AI messages per day, 10 public GitHub repos, access to core Express.js generation, community support, and early access to beta features—including the upcoming API client and DB preview tools.
Do I own the code?
Absolutely. All generated code belongs to you—Line0 never claims ownership, licensing rights, or usage restrictions. With two-way GitHub sync, your repository remains the single source of truth, and all artifacts reside under your control at every stage.
Can Line0 deploy my API services?
Not yet—but it prepares your code for deployment. Line0 outputs production-ready Express apps structured for seamless hosting on Vercel Edge Functions, Render, Railway, or traditional Node.js servers. Deployment automation integrations are planned for 2026.