AI mock data generator — realistic test JSON from a description
Describe the data (or paste a schema) and get realistic sample JSON rows for testing. This is a bring-your-own-key AI tool. It works with your own API key — and Groq and NVIDIA give free keys, so you can use it at no cost. Your key is stored only in this browser; your text is sent to your chosen provider through our server, which never logs or stores your key or text. It runs on the provider's servers, so it is not on-device.
How to use it
- Add an AI key in the key bar (free from Groq or NVIDIA; also Anthropic, OpenAI or xAI).
- Paste your text and pick any options.
- Press the button — the result comes back from your chosen AI. Copy or Download it.
FAQ
How do I generate mock data?
Describe the fields you need and choose how many rows; the AI returns a JSON array. It is told not to include real personal data.
Is my description kept private?
Your key lives only in this browser. Each request sends your text and key to your chosen provider through our server, which never logs or stores either. We keep no copy — but the provider processes your text under their terms.
Where do I get a free API key?
Groq (console.groq.com) and NVIDIA (build.nvidia.com) both offer free keys — no card needed. Paste one into the key bar once and it is remembered on this device. Anthropic, OpenAI and xAI keys work too.
Limits
Sample data is realistic but invented — never treat it as real records. For large volumes, generate in batches.
Related
Design the shape first with the JSON Schema tool.
Your key stays in this browser. Manage or clear all keys any time in Settings.