PromptCanaryTest your prompts like you test your code

Catch model drift before your users do. Add prompt regression tests to your existing test suite — Vitest, Jest, or any JavaScript test runner.

✅

Works With Any Test Runner

Regular functions that work in Vitest, Jest, Mocha, or any runner. No proprietary test format, no separate tool.

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Test across OpenAI, Anthropic, and Google Gemini simultaneously. Catch provider-specific regressions.

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Go beyond string matching. Embedding-based comparison detects subtle meaning shifts in responses.

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contains, notContains, maxLength, minLength, matchesRegex, isJson, matchesJsonSchema, plus runAll() for batch checks.

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Runs wherever your tests run. GitHub Actions, GitLab CI, any pipeline. Non-zero exit on failures.

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One npm package. No servers, no dashboards, no separate tools to manage.