Available worldwide
What is Mock Service Worker (MSW)?
An API mocking library that intercepts network requests at the browser and Node.js levels, allowing consistent mock responses across testing frameworks, tools, and applications without requiring client-specific stubs or configuration.
Mock Service Worker (MSW) pricing
We don't have Mock Service Worker (MSW)'s full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Platform & deployment
Independently observed- CLI
- Web
Integrations (8)
Independently observed- Vitest
- Playwright
- Storybook
- React Native
- Express
- fetch
- axios
- react-query
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Mock Service Worker (MSW) alternatives
Other api mocking we track, ranked by the same independent score.
- json-servermedium · 57%
- Prismhigh · 78%
- MockoonQuickly design and run realistic mock APIs locally without needing remote deployment or account setupmedium · 74%
- BeeceptorCreate mock API servers for development and testing without external dependencieshigh · 76%
- Nocklow · 43%
- Traffic ParrotSimulate APIs and services to test applications in isolation without dependencieshigh · 78%
Compare Mock Service Worker (MSW)
Side by side against other api mocking, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Mock Service Worker (MSW), not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Price level | 100 | 0.05 | 5.2 | ✓ |
| Release cadence | 99 | 0.05 | 5.1 | ✓ |
| Dependent projects | 68 | 0.06 | 4.3 | ✓ |
| Integrations | 27 | 0.09 | 2.6 | ✓ |
| Security score | 62 | 0.04 | 2.6 | ✓ |
| Stars | 80 | 0.03 | 2.1 | ✓ |
| Pricing transparency | 25 | 0.08 | 2.1 | ✓ |
| Reliability | 0 | 0.07 | 0.0 | - |
| Capabilities | 0 | 0.08 | 0.0 | - |
| Development activity | 0 | 0.09 | 0.0 | - |
| Security posture | 0 | 0.07 | 0.0 | - |
| Package downloads | 0 | 0.14 | 0.0 | - |
| Developer Q&A activity | 0 | 0.06 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Adoption
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 8 | mediumsource · 2026-08-17 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | TypeScript | highsource · 2026-08-26 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-08-26 · 95% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | highsource · 2026-08-17 · 75% |