Dummy Data Generator
Customize Your Data
Test a table or API consumer with synthetic records
Generate users, posts, todos or products as JSON or CSV. Select English or Japanese and 1–100 records. The seed controls repeatability, which is useful for comparing a table layout before and after a change. This tool does not import personal records or generate a custom database schema.
Choose the fields your screen needs
- Users: id, name, email, phone, city and age.
- Posts: id, title, body and author.
- Todos: id, title and completed.
- Products: id, name, category and price.
Use JSON and CSV deliberately
JSON returns an array of objects, including boolean values for completed and numbers for numeric fields. CSV contains a header and text rows; the importing application decides how to interpret types and encoding. When testing Japanese CSV, confirm that your spreadsheet or parser reads UTF-8. Copy the displayed content, copy the API URL, or save the file after the preview is ready.
Synthetic does not mean representative
Email addresses use example domains, and Japanese phone values include XXXX. Do not use the records for contacting people, identity checks or realistic population analysis. Repeated names and simple value distributions are intentional limitations. Test empty fields, long values and invalid records separately. For a file-size limit test instead of realistic rows, use exact-size test files.