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Sample JSON file

Create sample JSON files with configurable record count: 1 to 100,000 entries. Via the web form only, no signup. For JSON testing, mock data, and development.

Go to JSON generator

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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