1. To-Do List Application
Create a simple to-do list where users can add, edit, and delete tasks. Enhance it with features like due dates, priority levels, and categorization.

2. Weather App
Build a weather application that fetches and displays weather data from a public API based on user location or input.
3. Quiz Game
Develop a quiz game with multiple-choice questions. Include features such as a timer, scoring, and the ability to add new questions.
4. Calculator
Create a basic calculator that performs arithmetic operations. You can extend it to a scientific calculator with more complex functions.
5. Chat Application
Build a real-time chat application using WebSockets. Include features like user authentication, chat rooms, and message notifications.
6. E-commerce Storefront
Develop a front-end for an e-commerce site where users can browse products, add them to a shopping cart, and proceed to checkout.
7. Personal Portfolio Website
Create a portfolio website to showcase your projects, skills, and resume. Use animations and interactive elements to enhance the user experience.
8. Recipe App
Build an application that allows users to search for recipes, view details, and save their favorite ones. Integrate it with a recipe API for real-time data.
9. Expense Tracker
Develop an app to track personal expenses. Users should be able to add, edit, and delete expenses, as well as categorize them and visualize their spending through charts.
10. Memory Game
Create a memory card game where players match pairs of cards. Add levels of difficulty and track the number of moves made.
11. Interactive Maps
Build an interactive map using the Google Maps API. Include features like location markers, directions, and custom overlays.
12. Music Player
Develop a music player with features like play, pause, skip, and volume control. Include a playlist feature and integrate it with a music API for streaming.
13. Blog Platform
Create a blog platform where users can write, edit, and delete posts. Implement user authentication and commenting features.
14. Photo Gallery
Build a photo gallery that displays images from an API. Include features like search, filter by categories, and lightbox view.
15. Form Validation
Create a form with various input fields and implement client-side validation to ensure the data is correctly formatted before submission.
16. Markdown Previewer
Develop a markdown previewer that converts markdown text into HTML. Include a live preview feature.
17. Pomodoro Timer
Build a Pomodoro timer to help users manage their time. Include customizable work and break intervals.
18. Real-time Collaboration Tool
Create a collaborative tool like a shared text editor or drawing board using WebSockets, allowing multiple users to interact in real-time.
19. Fitness Tracker
Develop a fitness tracker that allows users to log their workouts, track progress over time, and set fitness goals.
20. Trivia Game
Build a trivia game where users can answer random questions. Include categories, scoring, and a leaderboard.
These projects can help you practice and enhance your JavaScript skills while creating useful applications. You can further expand and customize each project based on your interests and the specific technologies you want to learn.