JSON Test Data Generator for API & Automation Testing
JSON test data is fake but realistic data formatted as JSON objects or arrays. It's used by QA engineers and automation testers to validate APIs, populate databases, and test application behavior without touching production data.
If you're writing Selenium tests, calling REST APIs in Postman, or building Playwright scripts, you need test data that looks real but isn't.
Why JSON Test Data is Important for API & Automation Testing
When you're testing an API endpoint, you can't use real user data. It's either unavailable, incomplete, or a privacy risk. Writing test data by hand is slow and error-prone.
That's where a JSON test data generator helps. It creates realistic names, emails, phone numbers, addresses, and more—formatted as valid JSON. You can copy it directly into your automation scripts, API requests, or database seed files.
For example, if you're testing a user registration API, you need multiple test users with valid-looking emails and phone numbers. Generating 100 rows manually would take hours. A generator does it in seconds.
Generate JSON Test Data Using TestDataCraft
TestDataCraft is a browser-based tool for generating JSON test data. No login required. Everything runs locally in your browser, so your generated data never leaves your machine.
What you can do:
- Select from 50+ data fields (name, email, phone, address, UUID, etc.)
- Generate 1 to 100,000 rows of data
- Choose country-specific formats (India or USA phone numbers, addresses)
- Export as JSON, CSV, SQL, HTML, or XML
- Copy data instantly with one click
The interface is straightforward—checkboxes for fields, a number input for rows, and a generate button. No complicated configuration or API keys.
How to Generate JSON Test Data (Step-by-Step)
- Go to TestDataCraft — Open the tool in your browser
- Select fields — Check boxes for the data you need (e.g., Full Name, Email, Phone)
- Set row count — Enter how many records you want (1 to 100,000)
- Choose output format — Select JSON
- Generate — Click the Generate button
- Copy or download — Use the Copy button or download the JSON file
The entire process takes less than a minute. You can repeat it as many times as you need.
Common Use Cases
- Testing REST API endpoints (POST, PUT requests)
- Seeding test databases with fake users or records
- Automation testing with Selenium, Playwright, or Cypress
- Load testing APIs with realistic data
- Populating UI prototypes with sample data
- Creating demo environments for clients
- Testing data validation rules and error handling
Frequently Asked Questions
Is this free?
Yes. TestDataCraft offers a free version that lets you generate test data without any signup or payment. A lifetime license (₹149) is available for users who want to support the project and get priority support.
Can it be used for automation testing?
Yes. The generated JSON can be directly copied into your automation scripts (Selenium, Playwright, Cypress, REST Assured, etc.). You can also download it as a .json file and read it programmatically.
Is the data realistic?
Yes. TestDataCraft uses Faker.js-style generation to create data that looks real. Names, emails, phone numbers, and addresses follow realistic patterns. However, all data is completely fake and not tied to any real person.
No signup required. Works in your browser.