Generate Test Data as JSON Online
Test data should arrive in the format your system reads. The generator can download JSON directly.
Open the Mock Data Generator, add the columns you need with their data types, set the number of rows (up to 500,000) and choose the format when you download.
JSON gives you a list of records, ready for an API mock or a front end. Numbers and true/false values stay as such.
Names, emails, dates, numbers and ids look realistic, but they are made up, so the file is safe to share. Nothing is uploaded.
Everything runs in your browser and nothing is uploaded.
Related tool pages
- Fake Data Generator: Generate realistic fake data online: names, emails, addresses, dates and more, up to 500,000 rows, as CSV, JSON, Parquet or Excel. Free.
- Test Data Generator: Generate test data for databases and apps: names, emails, addresses, dates and numbers, up to 500,000 rows, as CSV, JSON, Parquet or Excel. Free.
- Fake Database for Testing: Create a fake database for testing: paste a CREATE TABLE script and get realistic rows as INSERT statements, CSV or JSON. Free, in your browser.
How to use the Mock Data Generator: step by step
- Open the Mock Data Generator.
- Add columns and types.
- Set the number of rows.
- Download JSON.
When to use the Mock Data Generator
- Fill a test database
- Demo a dashboard
- Load a pipeline test
- Share a sample without real data
Example
Input: Dataset: Customers, 3 rows
Output: id,name,email 1,Maya Patel,maya.patel@example.com 2,Leo Fischer,leo.fischer@example.com
Frequently asked questions
Is the data real?
No. It is random and fictional, so it is safe to share.
Can I get the same data again?
No – each click makes new data. Download to keep a set.
How many rows can the Data Generator create?
Up to 500,000 rows at a time. Choose column types such as names, emails, addresses and dates, then download as CSV, JSON, Parquet or Excel.
Tip: Use JSON for API mocks and UI tests. For many rows, remember the file gets large.