Top AI Repos — open-source AI, indexed and scored
Top AI Repos tracks AI repositories on GitHub and answers two different questions about each one: is it moving right now, and would you bet a product on it.
Top AI Repos tracks AI repositories on GitHub and answers two different questions about each one: is it moving right now, and would you bet a product on it.
Coverage-guided, in-process fuzzing for Node.js
| Date | Stars |
|---|---|
| 2026-07-24 | 354 |
| 2026-07-25 | 354 |
| 2026-07-28 | 354 |
| 2026-07-30 | 354 |
| 2026-08-06 | 354 |
Today
— stars today
This week
— stars this week
This month
— stars this month
Momentum
5.0
growth rate 0.00%/day
<div align="center">
<h1>Jazzer.js</h1>
<div style="text-align: center">
<img
src="https://7466322.fs1.hubspotusercontent-na1.net/hubfs/7466322/Logos/CI%20Logos/Jazzer.js%20logo.png"
height="150px"
alt="Jazzer.js logo"
/>
</div>
<hr />
<a href="https://www.code-intelligence.com/" target="_blank">Website</a> |
<a href="https://www.code-intelligence.com/blog" target="_blank">Blog</a> |
<a href="https://twitter.com/CI_Fuzz" target="_blank">Twitter</a>
</div>
Jazzer.js is a coverage-guided, in-process fuzzer for the
[Node.js](https://nodejs.org) platform developed by
[Code Intelligence](https://www.code-intelligence.com). It is based on
[libFuzzer](https://llvm.org/docs/LibFuzzer.html) and brings many of its
instrumentation-powered mutation features to the JavaScript ecosystem.
## Quickstart
To use Jazzer.js in your own project follow these few simple steps:
1. Add the `@jazzer.js/core` `dev-dependency`
```shell
npm install --save-dev @jazzer.js/core
```
2. Create a fuzz target invoking your code
```js
// file "FuzzTarget.js"
module.exports.fuzz = function (data /*: Buffer */) {
const fuzzerData = data.toString();
myAwesomeCode(fuzzerData);
};
```
3. Start the fuzzer using the fuzz target
```shell
npx jazzer FuzzTarget
```
4. Enjoy fuzzing!
## Usage
Jazzer.js can be used in two ways: Creating dedicated fuzz targets, as shown in
the [`Quickstart`](#quickstart) section, or integrated into the
[Jest test framework](https://jestjs.io/).
### Using test framework integration
**Note**: Using the test framework integration is the easiest and most
convenient way to fuzz your code, hence, it is recommended to use this approach
whenever possible.
To use fuzzing in your normal development workflow, a tight integration with the
[Jest test framework](https://jestjs.io/) is provided. This coupling allows the
execution of fuzz tests alongside your normal unit tests and seamlessly detect
problems on your local machine or in your CI, enabling you to check that found
bugs stay resolved forever.
Furthermore, the Jest integration enables great IDE support, so that individual
inputs can be run or even debugged, similar to what you would expect from normal
Jest tests.
**Note**: Detailed explanation on how to use the Jest integration can be found
at [docs/jest-integration.md](docs/jest-integration.md).
A Jest fuzz test, in this case written in TypeScript, looks similar to the
following example:
```typescript
// file: "Target.fuzz.ts"
import "@jazzer.js/jest-runner";
import * as target from "./target";
describe("Target", () => {
it.fuzz("executes a method", (data: Buffer) => {
target.fuzzMe(data);
});
});
```
**Note**: Please take a look at
[Enabling TypeScript in Jest tests](docs/jest-integration.md#enabling-typescript-jest-tests)
for further information on how to set up Jest fuzz tests written in TypeScript.
### Using fuzz targets
Creating fuzz targets and executing those via CLI commands is straightforward
and similar to what you would expect from other fuzzers. This approach offers
the most control and can easily be integrated in your CI pipelines via
`npm`/`npx` commands.
**Note**: Detailed explanation on how to create and use fuzz targets can be
found at [docs/fuzz-targets.md](docs/fuzz-targets.md).
A fuzz target can look as simple as this example:
```js
// file "FuzzTarget.js"
module.exports.fuzz = function (data /*: Buffer */) {
const fuzzerData = data.toString();
myAwesomeCode(fuzzerData);
};
```
ES modules are supported on Node.js >= 20.6 — use `export function fuzz` in a
`.js`/`.mjs` file with `"type": "module"` in your `package.json`. See
[docs/fuzz-targets.md](docs/fuzz-targets.md#esm-support) for details.
## Documentation
Further documentation is available at [docs/README.md](docs/README.md).
### Demo Video - Introduction to Jazzer.js
We recorded a live demo which shows how to get Jazzer.js up and running for your
own projects.Excerpt of 4,711 characters
Read on GitHubWould you bet a product on this? Bounded 0–100 and slow moving.
matched fp:c7003635a67a40fb, topic:testing