AI Prompts for Gemini for JavaScript

Write a JavaScript function that [DESCRIBE BEHAVIOR]. Requirements: [LIST]. Use modern ES2022+ syntax and handle edge cases including [LIST EDGE CASES].

Write a TypeScript interface and implementation for [CONCEPT]. Enforce: [TYPE CONSTRAINTS]. Include proper generics where applicable and JSDoc for the public API.

Convert this JavaScript to TypeScript: [PASTE CODE]. Add proper types, interfaces, and generics. Explain where you made type decisions that were not obvious.

Write an async JavaScript function that [DESCRIBE TASK]. Handle: network errors, timeouts, and cancellation. Use async/await and proper error propagation.

I am building a [REACT / NEXT.JS / VUE / NODE.JS] component or module that [DESCRIBE]. Current code: [PASTE IF ANY]. Write the next piece: [DESCRIBE WHAT IS NEEDED].

Write JavaScript that [DESCRIBE BROWSER TASK: HANDLES FORM SUBMISSION / UPDATES THE DOM / MAKES A FETCH REQUEST / MANAGES LOCAL STORAGE]. Include error handling and edge cases.

I need to handle [EVENT TYPE] on [ELEMENT]. Write the event handler that [DESCRIBE BEHAVIOR]. Make it work across browsers and handle edge cases like [LIST].

Write a vanilla JavaScript implementation of [UI BEHAVIOR: MODAL / DROPDOWN / INFINITE SCROLL / DRAG AND DROP / TAB PANEL]. No framework, just clean JavaScript and CSS where needed.

This JavaScript runs in the browser but is slow: [PASTE CODE]. Identify the performance issues: excessive DOM manipulation, blocking code, unnecessary re-renders. Suggest targeted fixes.

Write JavaScript to fetch data from [API ENDPOINT STRUCTURE] and render it to [DESCRIBE DOM TARGET]. Handle: loading state, error state, and empty state.

Write a Node.js [EXPRESS / FASTIFY / HONO] route handler for [ENDPOINT]. It should: [DESCRIBE BEHAVIOR]. Include input validation, error handling, and proper HTTP status codes.

Write a Node.js module that [DESCRIBE MODULE PURPOSE]. Export: [LIST EXPORTS]. Handle errors properly and include JSDoc for the public API.

I need middleware for [PURPOSE: AUTHENTICATION / RATE LIMITING / LOGGING / REQUEST VALIDATION]. Write it for [EXPRESS / FASTIFY / NEXT.JS API ROUTES].

Write Node.js code to connect to [DATABASE: POSTGRESQL / MONGODB / REDIS] and perform [OPERATIONS: QUERY / INSERT / UPDATE]. Include connection pooling and error handling.

I have a Node.js memory / performance issue: [DESCRIBE SYMPTOMS]. Possible causes in my code: [PASTE RELEVANT SECTIONS]. Diagnose the issue and suggest fixes.

I am getting this JavaScript error: [PASTE ERROR AND STACK TRACE]. Relevant code: [PASTE]. What is causing it and how do I fix it?

This async code has a race condition: [PASTE CODE]. Where is it happening, why, and how do I fix it correctly?

Review this JavaScript code for common issues: [PASTE CODE]. Check for: async/await mistakes, closure bugs, prototype issues, memory leaks, and security risks.

Explain the JavaScript event loop behavior in this code: [PASTE CODE]. Why does it execute in [OBSERVED ORDER] rather than [EXPECTED ORDER]?

Write Jest tests for this JavaScript module: [PASTE MODULE]. Include: unit tests, mocked dependencies, async tests, and error case coverage.