Jazzer

7.2easy start · #5 of 27
in Fuzz Testing Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Linux, Mac, Windows.

Jazzer is ranked #5 of 27 in fuzz testing software on The Geeks Club. It runs on Linux, macOS, Windows. There is a free plan.

Jazzer plans and pricing

All plans

Jazzer Free Coverage-guided, in-process fuzzing for the JVM · Linux x86_64 and arm64, macOS 12+ x86_64 and arm64, Windows x86_64 github.com · 29 Sept 2026

Compared on fuzz testing software

Free plan: Yes
Input generation methods: mutation, generation
Target types: JVM applications, Java, Kotlin, Scala, Clojure, JNI/native libraries
Coverage guidance: Yes
Crash triage: Yes
Execution mode: local
Supported languages: Java, Kotlin, Scala, Clojure
CI/CD support: Yes

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The record

Purpose: Jazzer is a coverage-guided, in-process fuzzer for the JVM based on libFuzzer.
JUnit integration: Jazzer integrates with JUnit 5.9.0 or newer, allowing fuzz tests alongside regular unit tests.
Build tools: The README documents use with Maven, Gradle, and Bazel, including support through rules_fuzzing.
Input generation: The @FuzzTest annotation lets Jazzer automatically generate and mutate method parameter inputs, including primitives, strings, arrays, and standard library classes.
Run modes: JUnit fuzz tests can run in regression mode using saved crashing inputs or fuzzing mode to generate and mutate inputs for new coverage.
Standalone use: Jazzer can run standalone as a binary downloaded from GitHub release archives or through its Java main class.
Bug detectors: Built-in sanitizers detect Java security issues including SSRF, file path traversal, and OS command injection, and provide feedback to guide fuzzing.
Sanitizer configuration: The README says SSRF and file path traversal sanitizers can be configured at runtime through BugDetectorsAPI.
OSS-Fuzz: Code Intelligence and Google have brought support for Java, Kotlin, and other JVM languages to Google's OSS-Fuzz project.
Distribution: The jazzer-junit package is available on Maven Central and the README says it is signed with a published key.
License: The GitHub repository identifies Jazzer as licensed under Apache-2.0.
Platform support: The README lists Linux x86_64 and arm64, macOS 12+ x86_64 and arm64, and Windows x86_64 as supported platforms.
Headquarters: Bonn, Germany
Price from: Free

Where it ranks on The Geeks Club

Best Fuzz Testing Software in 2026#5 of 27

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Sources

github.com/CodeIntelligenceTesting/jazzer· checked 29 Sept 2026