Why API-First Design Beats UI-First Approaches for Test Data Generation

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Test data tools built around a UI struggle to support automation, CI pipelines, and bulk data generation, since these workflows require programmatic control rather than manual clicks. An HTTP API can be called from any language or tool, making it scriptable, versionable, and suitable for integration into seed scripts and automated pipelines. Generating large volumes of test data — such as 50,000 records — is practical via an API parameter but impractical through a UI. When a UI is built first, the API often arrives as an incomplete afterthought that fails to match the frontend's full capabilities. JsonFabrica follows an API-first model so that its data generation can be scripted, versioned, and executed anywhere, with a UI layered on top rather than serving as the foundation.

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