Leetcode like platform to practice logic based coding problems. Built using Express.js, React.js, Postgres, and Docker containers for code execution.

• Features
• Tech Stack
• How It Works
• Setup
  • Using Docker Compose
  • Running Backend and Frontend Separately
• Contributing

• JWT Based User Authentication
  • Register
  • Login
  • Email token verification
  • Forgot password with OTP
• Code Editor
  • Syntax Highlighting (with Shiki.js)
  • 4 Languages Supported (Python, C, C++, Java)
  • Problem Statements rendered as Markdown, with support for code blocks
  • Sample Test Cases for each problem with expected output
  • Custom testcases can be set by the user
  • Custom starter code for each problem statement and language
• Sandboxed Code Execution
  • Docker container for each code execution
  • Limit time used by code
• Test code against sample test cases before submission
• Verify output against hidden test cases
• Persist code to local storage
• AI Assistant
  • LLaMA will provide hints for the problem statement, with access to the code written by the user as context
  • Streaming response from the AI Assistant, for a more interactive experience
• Points
  • +10 if the user solves a problem statement in the first submission
  • +5 if the user solves a problem statement in more than one submission
  • no points awarded if user solves a problem statement correctly more than once
• Leaderboard ranking based on points
• User Profile
  • GitHub-like submission graph
  • Total submissions
  • Points earned
  • Problems solved
• Editorials for each problem statement
  • Markdown rendered editorials
  • Code blocks in editorials
  • User can submit editorials after solving the problem statement
• Critical endpoints are rate limited to prevent abuse
• Analytics using PostHog
  • Track user interactions on the platform
• View Past Submissions
  • View code submitted for each problem statement

• Express.js (Backend + Execution Worker)
• Python (for code execution on the container)
• React.js (Frontend)
• Redis (for internal messaging, storing OTPs, saving code execution results)
• PostgreSQL (with Prisma ORM)
• Docker (with docker-compose)
• Dockerode (for managing docker containers)
• Resend (for sending emails)
• Shadcn/UI (for frontend components)
• Shiki.js with Monaco Editor (for code editing with syntax highlighting)
• Meta LLaMA 4 17b (CloudFlare Workers AI)
• GitHub Actions (for CI/CD)
• PostHog (for analytics)

You can either use the docker-compose file to run the project or run the backend and frontend separately.

• Clone the repository
• Copy the .env.example file to .env and fill in the required values in both frontend/ and backend/ directories.
• Run docker compose up in the root directory
• The project will be running on localhost:8000

• Clone the repository
• Copy the .env.example file to .env and fill in the required values in both frontend/ and backend/ directories.
• Run Redis
  • Run:

    docker run -d -p 6379:6379 redis

• Run Postgres
  • Run:

    docker run -d -p 5432:5432 -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=onlineide postgres

• Run the backend server
  • Navigate to the backend directory
  • Run npm install
  • Run npm run dev
• The backend server will be running on localhost:3000
• Run the frontend server
  • Navigate to the frontend directory
  • Run npm install
  • Run npm start
• The project will be running on localhost:5173

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change. For more details, please refer to the CONTRIBUTING.md file.