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    Bolt.new & Base44 Tech Stack: Architecture & Security Guide

    Bolt.new and Base44 are two of the most popular AI app builders in 2026. This guide breaks down how each platform works under the hood, their deployment architectures, and what you need to secure before shipping to production.

    Bolt.new Tech Stack Overview

    Bolt.new is built on StackBlitz WebContainer technology, which runs a full Node.js environment directly in the browser. This means code compilation, bundling, and preview all happen client-side without a remote server. The AI generates React, Next.js, Vite, or plain Node.js projects, and the WebContainer executes them in real-time so you can see changes instantly.

    Bolt.new supports npm package installation, file system operations, and terminal commands -- all within the browser sandbox. For backend functionality, most Bolt.new apps integrate with Supabase (database, auth, storage) or use serverless API routes deployed alongside the frontend.

    Bolt.new Deployment Architecture

    When you deploy a Bolt.new project, the code is pushed to Netlify or Vercel. The typical deployment is a static site (React SPA) with serverless functions for any server-side logic. Static assets are served from a CDN, and API routes run as serverless functions that cold-start on demand.

    Environment variables are managed through the deployment platform (Netlify or Vercel dashboard). A common security mistake is leaving sensitive keys in the source code rather than using environment variables, because the AI often hardcodes example values during development. Always verify that .env files are in .gitignore and that secrets are configured in the deployment platform.

    Bolt.new and Supabase Integration

    Supabase is the default backend for most Bolt.new apps. The integration pattern uses the Supabase JavaScript client with an anon key (public) and a service role key (private). The anon key is intentionally exposed in client-side code -- this is by design, and security relies entirely on Row Level Security (RLS) policies.

    The most common security issue in Bolt.new + Supabase apps is missing or misconfigured RLS policies. AI-generated code often creates database tables without enabling RLS, which means any user with the anon key can read and write all data. Always verify that RLS is enabled on every table and that policies enforce proper access control.

    Base44 Tech Stack Overview

    Base44 takes a different approach from Bolt.new. Instead of running code in the browser, Base44 provides a cloud-based IDE that generates React frontends with a custom backend infrastructure. The platform includes a built-in database, automatic API generation from data models, and integrated hosting.

    Base44 abstracts away most backend complexity. You define data entities, and the platform auto-generates CRUD APIs, admin panels, and frontend components. This reduces development time but means you have less visibility into the backend implementation compared to Bolt.new's more transparent approach.

    Base44 Authentication and Security

    Base44 provides built-in authentication with email/password login, session management, and role-based access control. API keys are generated per project and managed through the Base44 dashboard. The platform handles token refresh, session expiry, and password hashing at the infrastructure level.

    Security considerations for Base44 include: verifying that API endpoints enforce authentication (some auto-generated endpoints may be public by default), checking that data access rules match your authorization model, and ensuring that client-side code does not expose admin API keys. Because Base44 manages the backend, you have limited control over server-side security configurations.

    Production Security Best Practices

    Whether you are shipping with Bolt.new or Base44, these security steps apply to both platforms before going live:

    1

    Move all API keys and secrets to environment variables -- never hardcode them in source files

    2

    Enable Row Level Security (RLS) on all Supabase tables if using Supabase as your backend

    3

    Audit authentication flows: test password reset, session expiry, and token refresh

    4

    Run a dependency audit (npm audit or Snyk) before every production deployment

    5

    Configure Content Security Policy headers to prevent XSS attacks

    6

    Set up HTTPS-only access and redirect all HTTP traffic

    7

    Review CORS configuration -- restrict origins to your production domain only

    8

    Run a VibeEval scan on your deployed app URL to catch runtime vulnerabilities

    Related Resources

    Is Bolt.new Safe?

    Safety assessment and security findings for Bolt.new apps

    Bolt.new Security Review

    Detailed security analysis of the Bolt.new platform

    Base44 Security Review

    Security analysis of Base44 platform and generated apps

    Scan Your Bolt.new or Base44 App

    VibeEval tests your deployed app for exposed keys, missing RLS, auth bypasses, and other vulnerabilities common in AI-built apps. Results in 60 seconds.

    Start Free Security Scan