JSON Parser Fuzzer

A fuzzing harness for testing JSON parsing functionality with selective module instrumentation.

Capabilities

Implements selective module instrumentation

• The fuzzer uses a context manager to automatically instrument imported modules before they are loaded @test
• The fuzzer excludes the json module from instrumentation to avoid affecting the standard library @test
• The fuzzer includes application-specific modules for instrumentation @test

Parses JSON inputs with error handling

• The fuzzer accepts byte inputs and attempts to parse them as JSON @test
• The fuzzer handles invalid JSON inputs gracefully without crashing @test
• The fuzzer processes valid JSON inputs successfully @test

Implementation

@generates

The fuzzer must instrument imported application modules while excluding standard library modules. All imports that need instrumentation must occur after instrumentation is configured.

API

def TestOneInput(data: bytes) -> None:
    """
    Fuzzing entry point that tests JSON parsing.

    Args:
        data: Raw bytes from the fuzzer to be tested
    """
    pass

Dependencies { .dependencies }

atheris { .dependency }

Provides Python fuzzing capabilities with import instrumentation support.