Faker vs Faker.js
Faker
faker.readthedocs.io
Faker.js
fakerjs.devSide by side
| Figure | Faker | Faker.js |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Test Data Generation Tools | 7.7 (#10) | 7.5 (#16) |
| Data types | Built-in providers generate values such as names, addresses, and text. | Faker can generate person, location, date, finance, commerce, and other data through its modules. |
| Localization | Faker supports single and multiple locales and falls back to en_US when a localized provider is unavailable. | Faker provides pre-built instances for more than 70 locales and lets users build custom locales. |
| Purpose | Faker is a Python package for generating fake data for database bootstrapping, XML documents, stress testing, and anonymizing production data. | Faker generates fake but realistic data for testing and development. |
Plans
In their own words
Faker.js
Faker.js is a free JavaScript library for generating synthetic data that resembles realistic information during testing and development. Its modules produce person, location, date, finance, commerce, and other data. Documented uses include unit tests, performance tests, demos, and development before a backend is complete. Pre-built instances cover more than 70 locales, and custom locales can be created. The implementation runs in browsers and Node.js; Faker v10 requires Node.js 20 or newer. Installation guidance covers npm, pnpm, yarn, and Deno, with examples for Vitest, Jest, Cypress, and Playwright. A seed can make generated values repeatable, although identical seeds may produce different results between Faker versions. The full package exceeds 5 MiB when minified, and its guide advises against deploying the entire package in a web app. Locale coverage varies, with some combinations using English fallback data or lacking applicable data. Faker is MIT licensed for commercial and non-commercial use and is self-hosted.