Question: Can you recommend a tool that generates custom JSON data based on user-defined prompts?

If you're looking for a way to generate custom JSON data based on prompts you define yourself, JSON Data AI is a great option. The tool lets you define prompts to create custom JSON data and then convert them into live API endpoints. It comes with prebuilt formats for popular subjects, can generate endpoints, and lets you save and edit responses. The Pro version adds other abilities like better results, pagination and unlimited use, so it's good for fast, flexible data generation.

Another option is BulkGPT, a no-code tool that marries AI workflows with internet-based processing and web scraping. It can be used for tasks like data scraping, content generation and SEO product descriptions. BulkGPT lets you define your own AI workflows and run multiple jobs in parallel, which is useful for e-commerce, marketing and data scraping. Its support for CSV, JSON, HTML and Markdown file formats means you can use it for a variety of tasks.

For people who need to generate and manipulate tabular data, Gretel Navigator is a compound AI system that can generate, edit and amplify tabular data with SQL or natural language prompts. It's good for training foundation models, fine tuning large language models and creating evaluation datasets. It also comes with a real-time inference API for direct integration into data services, so it's a good option for data augmentation and ML training.

Last, Prompt Mixer is a collaborative workspace for building AI features. It lets you build, test and evaluate AI-powered solutions with prompts and chain prompts with Markdown. With built-in connectors to several AI providers, it can handle complex test scenarios and custom JavaScript or Python code. It's good for content generation, data management and personal use, with an encrypted storage system for prompts and customizable deployment to API endpoints.