How it works
- 1Enter, paste, or choose the source data.
- 2Adjust the available controls and run or preview the tool.
- 3Copy or download the generated result.
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BROWSER · Browser JavaScript / Web APIs
Mock / Dummy JSON Data Generator
Build repeatable mock JSON, JSONL, or CSV data from a visual schema without uploading anything.
✓ Runs locally in your browser✓ No account required✓ No file upload to our server
About this tool
Build repeatable mock JSON, JSONL, or CSV data from a visual schema without uploading anything. Processing is performed locally where browser APIs allow.
Frequently asked questions
Does this upload my data?
No. The core processing runs locally in your browser.
Do I need to install software?
No. A modern browser is sufficient.