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Fast-check Alternatives
Similar projects and alternatives to fast-check
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Playwright
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
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SurveyJS
JavaScript Form Builder with No-Code UI & Built-In JSON Schema Editor. Add the SurveyJS white-label form builder to your JavaScript app (React/Angular/Vue3). Build complex JSON forms without coding. Fully customizable, works with any backend, perfect for data-heavy apps. Learn more.
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rescript
ReScript is a robustly typed language that compiles to efficient and human-readable JavaScript.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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loadtest
Runs a load test on the selected URL. Fast and easy to use. Can be integrated in your own workflow using the API.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better fast-check alternative or higher similarity.
fast-check discussion
fast-check reviews and mentions
Posts with mentions or reviews of fast-check.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-10-30.
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Best Testing Practices in Node.js
For instance, the function addNewProduct(id, name, isDiscount) can be tested with multiple combinations of (number, string, boolean) such as (1, "iPear", false), (2, "Universe XL", true), or (0, undefined, null). By using libraries like fast-check, you can automate property-based testing within your favorite test runner.
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Dealing with Unicode string, done right and better.
fast-check is the most popular PBT tool in JavaScript ecosystem. With fast-check, I can easily write test code that defines properties and verifies them based on automated inputs.
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The 5 principles of Unit Testing
Libraries like JSVerify or Fast-Check offer essential tools to facilitate property-based testing.
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How to Survive Your Project's First 100k Lines
Strong agree!
For JavaScript, I suggest folks check out fast-check [0] and this introduction to property-based testing that uses fast-check [1].
This is broadly useful, but one specific place I've found it helpful was to check redux reducers against generated lists of actions to find unchecked edge cases and data assumptions.
[0] https://github.com/dubzzz/fast-check
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Master property-based testing in JavaScript: A step-by-step tutorial
Brilliant, this is a massive improvement. Previously I was fumbling around in https://github.com/dubzzz/fast-check/tree/main/packages/fast-check/documentation for info.
- Bring the power of property based testing framework fast-check into Vitest
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[AskJS] Should I be generating random data for parameters when unit testing?
There's a library for exactly that: FastCheck.
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Integrate Jest and fast-check together
It makes @fast-check/jest, the best option to integrate Jest and fast-check, as it provides an abstraction over both to ease their mutual integration.
- I Created an API to Generate Mock Information
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Generating dummy entities with random data for tests based on types
The closest that I know of (and I have not used this) is zod-fast-check. It generates fast-check “arbitraries” (test data generators) for property-based testing based on zod schemas. Of course, this requires that you use zod to define your types, which has some downsides. Fortunately there is another tool, ts-to-zod, (which I also have not used) which will codegen zod schemas based on TS type definitions. If you thread these four libraries together you should end up with the ability to write random tests on generated data with very little overhead. In theory.
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A note from our sponsor - SurveyJS
surveyjs.io | 17 May 2025
Stats
Basic fast-check repo stats
23
4,506
9.8
7 days ago
dubzzz/fast-check is an open source project licensed under MIT License which is an OSI approved license.
The primary programming language of fast-check is TypeScript.
Sponsored
JavaScript Form Builder with No-Code UI & Built-In JSON Schema Editor
Add the SurveyJS white-label form builder to your JavaScript app (React/Angular/Vue3). Build complex JSON forms without coding. Fully customizable, works with any backend, perfect for data-heavy apps. Learn more.
surveyjs.io