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by Praise Moyinoluwa
Generate 5 AI-powered Instagram captions with hashtags using OpenAI GPT-3.5-turbo. This TypeScript chain combines a Node.js backend API (port 9029) with a React + Tailwind frontend, handling topic input and displaying captions with one-click copy functionality. Perfect for content creators needing quick, engaging social media copy. Licensed under Tetrees License.
Viral Caption AI is a full-stack AI-powered Instagram caption generator built with TypeScript. It combines a React frontend UI with an OpenAI-powered backend plugin to generate 5 unique, hashtag-rich captions for any topic. Users enter a subject, and the app instantly returns scroll-stopping captions ready for social media posting.
Frontend:
Backend:
Install dependencies:
npm install
Create .env file with your OpenAI API key:
OPENAI_API_KEY=sk-...your-real-key-here...
PORT=9029
Build and start:
npm run build
npm start
Server runs on port 9029 by default.
Development mode:
npm run dev
Install dependencies:
npm install
Start development server:
npm run dev
Build for production:
Spin up an isolated sandbox and run it server-side — no local setup.
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npm run build
http://localhost:9029
https://back.tetrees.ai/api/sandbox-bridge/sandbox-d2ffe3db4e74b0e2f1bd8f27d054a599
/ or /generateGenerate 5 AI-powered Instagram captions with hashtags for a given topic.
Request Body:
{
"topic": "sunset photography"
}
Response:
{
"topic": "sunset photography",
"captions": [
"Stay inspired with sunset photography 💡 #sunsetphotography #motivation #inspiration",
"Loving every moment of sunset photography ✨ #sunsetphotography #lifestyle #vibes",
"sunset photography is the best thing that happened to me 🔥 #sunsetphotography #goals #trending",
"Can't stop thinking about sunset photography 💫 #sunsetphotography #daily #explore",
"Embrace the magic of sunset photography 🌟 #sunsetphotography #love #instagood"
]
}
Error Response (400 Bad Request):
{
"error": "topic is required and must be a non-empty string"
}
cURL Example:
curl -X POST http://localhost:9029/ \
-H "Content-Type: application/json" \
-d '{"topic":"sunset photography"}'
| Variable | Default | Required | Description |
|---|---|---|---|
OPENAI_API_KEY | — | ✅ Yes | OpenAI API key for GPT-3.5 |
PORT | 9029 | No | Backend server port |
Tetrees License
The sandbox audition completed and the detected runnable path passed.
This React web app completed archive review with strong static results. Structure, dependency manifests, documentation, functional source, and common risk patterns were checked by the Tetrees verification pipeline; runtime phases are stated separately. Final verified scores after isolated runtime evidence: overall 9.2 and security 9.5.
Deterministic AVCP artifact review
Pipeline avcp-2026-08-04.1 · SHA-256 0b5fcc8633680cf6…
This version-scoped review deterministically inspects the submitted archive for structure, dependencies, documentation, functional source, and common malicious or high-risk signals. Build and test phases are reported as passed only after an isolated sandbox audition. It is not a guarantee of perfect security.
Reviewed Aug 7, 2026
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