Dummy JSON Generator

Generate test JSON data for API mocks, frontend development, Postman, Swagger examples, prototypes, and demos.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

Тестовый JSON is a free online tool. Генератор тестовых JSON-данных для API mock, frontend-разработки, Postman, Swagger examples, прототипов и демо. Обработка выполняется локально в браузере. Данные не отправляются на сервер.

What it does

Output

Processing

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Data passed between tools is kept only in the current browser session.

How to use

Choose how many objects should be in the JSON array.
Pick a data template: users, products, orders, posts, or a custom schema.
Set the output format: pretty or minified.
Click Generate.
Copy the JSON or download a .json file.

More about this tool

The Dummy JSON Generator creates mock data in JSON format directly in your browser. It is useful for frontend development, API mocks, Postman, Swagger examples, prototypes, tests, demo pages, and local debugging. You can choose the number of objects, a data template, output type, pretty or minified formatting, and copy or download a .json file. Generation runs locally in your browser, and your data is not sent to the UtiLab server.

Runs in the browser
Data is not sent to the server
Generates valid JSON
You can choose the number of objects
Templates for users, products, orders, and posts
Supports a custom schema
Copy or download .json
No registration required

Frequently Asked Questions

How do I generate test JSON?

Choose the number of objects, pick a data template, and click Generate. Then copy the JSON or download it as a .json file.

What is test JSON used for?

Test JSON is used for frontend development, API mocks, Postman, Swagger examples, prototypes, tests, and demo data.

Is my data sent to the server?

No. Generation runs locally in your browser and is not sent to the UtiLab server.

Will the JSON be valid?

Yes. The result is built with JSON.stringify and is valid JSON without trailing commas or unescaped strings.

Can I choose the object structure?

Yes. You can pick a ready-made template such as users, products, orders, or posts. A custom schema is available for more flexibility.

Can I download the JSON as a file?

Yes. You can download the result as a .json file, for example test-data.json.

What is the difference between pretty and minified?

Pretty JSON includes line breaks and indentation and is easier to read. Minified JSON is smaller and written on one line.

Can I use the result in Postman?

Yes. Copy the JSON into Postman, a mock server, frontend code, or API documentation.

Can it generate real personal data?

The tool creates test data. Do not put real personal data into mock files unless you truly need to.

Do I need to register?

No. The tool works immediately without registration.

More about this tool

Runs in the browser
Data is not sent to the server
Generates valid JSON
You can choose the number of objects
Templates for users, products, orders, and posts
Supports a custom schema
Copy or download .json
No registration required

Frequently Asked Questions

How do I generate test JSON?

Choose the number of objects, pick a data template, and click Generate. Then copy the JSON or download it as a .json file.

What is test JSON used for?

Test JSON is used for frontend development, API mocks, Postman, Swagger examples, prototypes, tests, and demo data.

Is my data sent to the server?

No. Generation runs locally in your browser and is not sent to the UtiLab server.

Will the JSON be valid?

Yes. The result is built with JSON.stringify and is valid JSON without trailing commas or unescaped strings.

Can I choose the object structure?

Yes. You can pick a ready-made template such as users, products, orders, or posts. A custom schema is available for more flexibility.

Can I download the JSON as a file?

Yes. You can download the result as a .json file, for example test-data.json.

What is the difference between pretty and minified?

Pretty JSON includes line breaks and indentation and is easier to read. Minified JSON is smaller and written on one line.

Can I use the result in Postman?

Yes. Copy the JSON into Postman, a mock server, frontend code, or API documentation.

Can it generate real personal data?

The tool creates test data. Do not put real personal data into mock files unless you truly need to.

Do I need to register?

No. The tool works immediately without registration.