Sinon.JS
Sinon.JS — Standalone JavaScript library providing test spies, stubs, and mocks compatible with any test runner.
Our Verdict
Still useful for non-Jest runners, though built-in mocking in Jest and Vitest covers most new projects.
Pros
- Runner-agnostic spies, stubs, and mocks
- Works with Mocha, Jest, Vitest, etc.
- Mature API with clear documentation
- Timers and fake XHR helpers included
Cons
- Jest and Vitest have built-in mocks now
- API surface is larger than most teams need
- Less active development recently
When to Use Sinon.JS
Good fit if you need
- Test spies tracking calls, arguments, and return values
- Stubs replacing functions with controllable behavior
- Mock timers for testing setTimeout and setInterval code
- Framework-agnostic: works with Mocha, Jest, or QUnit
Pricing
Price wrong?Sinon.JS Pricing
- Pricing Model
- free
- Free Tier
- Yes
- Entry Price
- —
- Enterprise Available
- No
- Transparency Score
- —
Beta — estimates may differ from actual pricing
Estimated Monthly Cost
$25
Estimated Annual Cost
$300
Estimates are approximate and may not reflect current pricing. Always check the official pricing page.
Project Health
Health Score
10
7 days
3d
50
N/A
NOASSERTION
Last checked: 2026-04-21
Lock-in Assessment
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