What is a sample JSON file?

A sample JSON file contains synthetic JSON data – arrays or objects with placeholder values. Developers use it to test API clients, verify pagination, or load applications with defined data volumes.

dummyfiles.dev generates such files: you set the number of records (1 to 100,000). The structure is an array of objects with typical fields (e.g. id, name, value). Download or API.

Features

Records: 1 to 100,000.

Structure: JSON array of objects; fields like id, name, value (placeholders).

Format: Valid JSON, usable directly in APIs or tests.

API: GET request with parameter for the number of entries.

Use cases

• Test API clients and consumers
• Verify pagination and lazy loading
• Test frontends with large data sets
• Automated tests/pipelines: repeatable mock data
• Performance tests with defined payload size

Highlights

• Up to 100,000 records
• No registration
• GET API
• Optional filename for download

FAQ

How do I create a sample JSON file?

On the homepage open the “JSON” tab, set the number of records, click “Create file”. Or call the API.

Can I customize the JSON structure?

The structure is predefined (array of objects with standard fields). For custom schemas, use your own mock server.

Is this suitable for unit tests?

Yes. The API returns reproducible JSON data for the same parameters.

How large is the file?

Depends on the number of records. 100,000 entries can be several MB.

Do I need an API key?

No. The API works without signup.

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