CodeIntelligenceTesting/jazzer

Health v2 · maintenance only

Adoption not part of the score

1260 stars · 172 forks observed · 2026-10-10

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Jazzer is a coverage-guided, in-process fuzz testing engine for the JVM, based on libFuzzer. It integrates with JUnit 5 and build tools like Maven, Gradle, and Bazel to find bugs and security vulnerabilities in Java, Kotlin, and Clojure code.

Use cases

• fuzz test java code for security vulnerabilities
• find crashes and bugs in jvm applications with random inputs
• integrate fuzz testing into junit test suite
• coverage-guided fuzzing for kotlin or clojure
• detect vulnerabilities in java libraries before release
• run fuzz tests in ci with maven or gradle

When to choose

• you develop JVM software (Java, Kotlin, Clojure) and want automated bug and vulnerability discovery
• you want fuzz tests to live alongside regular JUnit unit tests
• you need libFuzzer-style coverage-guided mutation on the JVM

When to avoid

• your code does not run on the JVM (use libFuzzer, AFL++, or Jazzer.js instead)
• you only need conventional example-based unit tests without random input generation
• you need fuzzing for memory-unsafe native code with direct memory instrumentation

Facets

library · maturity active

fuzzing testing security vulnerability-scanning testing security developer-tools windows jvm cli java kotlin clojure junit libfuzzer coverage-guided maven gradle bazel jvm linux macos

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