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 clients and parsers, 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). Instant download via the web form.

Features

Records: 1 to 100,000.

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

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

Use cases

• Test JSON processing and imports
• 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
• Use via the website
• 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”. Use the matching tab on the homepage.

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 same form settings yield reproducible JSON data.

How large is the file?

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

Do I need an account?

No. The generator works without signup.

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