FREEDOM251

Freedom251 › Static Analysis Tools

Joern

Free plan APILinuxMacSelf-hostedWindows

Visit Joern Alternatives

Joern's own site

What Joern is

Joern analyzes source code, bytecode, and binary code for vulnerability discovery and static program analysis. It represents programs as code property graphs, a shared graph structure designed to support analysis across languages. Users can explore those graphs with a strongly typed, extensible domain-specific language based on Scala. Its analysis capabilities include parsing, taint analysis, search queries, and passes that extend code property graphs.

Joern Scan runs predefined queries against a program’s graph and reports matching issues and their locations. Users can choose queries by tag or name, and the default query database accepts community contributions. Teams can turn queries into custom scanners and run them in CI. Joern can also be used as a library or through REST and HTTP APIs; server mode lets clients query graphs or delegate graph construction and queries. Documented frontends cover C, C++, C#, Go, Java, JavaScript, Kotlin, PHP, Python, Ruby, Swift, x86/x64, and JVM bytecode, with varying maturity. Prebuilt releases are available for Linux, macOS, and Windows, with x86_64 and ARM64 builds. Joern is free, open source under Apache-2.0, and requires JDK 21. Docker-based execution is documented, and the project links to a community Discord.

Who it suits

Joern suits security researchers and developers who need to analyze source, bytecode, or binaries using graph-based queries. It also fits teams that want to build custom security scanners and run them in CI, or access graph analysis through a library or API.

What it does well

  • Analyzes source code, bytecode, and binary code.
  • Code property graphs support cross-language analysis.
  • Includes parsing, taint analysis, and search queries.
  • Custom scanners can run in CI.
  • Free and open source under Apache-2.0.
  • Prebuilt distributions cover Linux, macOS, and Windows.

What to know first

  • Language frontends have varying maturity levels.
  • The server does not implement sandboxing.
  • JDK 21 is the listed runtime requirement.

Getting started

  1. Visit https://joern.io/ and choose an installation route.
  2. Get a prebuilt joern-cli distribution for Linux, macOS, or Windows, or use the documented Docker-based execution.
  3. Use JDK 21, the listed runtime requirement.
  4. Run Joern locally or in server mode, then query code property graphs or use Joern Scan.
  5. For automation, wrap queries into custom scanners and run them in CI.

Verdict

Choose Joern if you need an open-source platform for graph-based code analysis, customizable queries, or CI security scanners. Its breadth of language frontends and API options support varied workflows, but the server should not be treated as a security boundary.

Questions

How much does Joern cost?

Joern is free, with a free plan.

Which platforms does Joern support?

Joern lists API, Linux, macOS, self-hosted, and Windows. Prebuilt platform distributions are listed for Linux, macOS, and Windows, with x86_64 and ARM64 builds.

What languages can Joern analyze?

Documented frontends include C, C++, C#, Go, Java, JavaScript, Kotlin, PHP, Python, Ruby, Swift, x86/x64, and JVM bytecode. Their maturity levels vary.

Is Joern open source?

Yes. The project identifies Joern as open source under the Apache-2.0 license.

Can Joern run in CI or through an API?

Yes. Queries can be wrapped into custom scanners for CI, and Joern can be used as a library or through REST and HTTP APIs.

What runtime does Joern require?

The repository lists JDK 21 as a requirement and says other versions may work but have not been properly tested.

Facts from Joern's own pages

Analysis features
Joern provides static taint analysis to trace attacker-controlled data through code. · docs.joern.io, 9 Oct 2026
API
Joern can run as an HTTP server, allowing clients to query code property graphs and delegate graph construction and querying to a server machine. · docs.joern.io, 9 Oct 2026
Automation
Users can run Joern in non-interactive mode with scripts containing Scala code and Joern directives. · docs.joern.io, 9 Oct 2026
CI use
The official site says users can wrap queries into custom scanners and run Joern-based scanners in CI. · joern.io, 9 Oct 2026
Code representation
It generates code property graphs, a representation designed for cross-language code analysis. · docs.joern.io, 9 Oct 2026
Community
The official site links to a Joern community Discord. · joern.io, 9 Oct 2026
Customization
Users can select Joern Scan queries by tags or names, and the default query database accepts community contributions. · docs.joern.io, 8 Oct 2026
Deployment
The project documents Docker-based execution, including running Joern in server mode. · github.com, 9 Oct 2026
Extensibility
Plugins can add queries, interact with Java libraries, and extend the code property graph schema. · docs.joern.io, 9 Oct 2026
HTTP API
Joern’s server exposes an HTTP API for querying code property graphs from non-JVM languages and for outsourcing graph construction and queries to a server. · docs.joern.io, 8 Oct 2026
Installation
Prebuilt joern-cli binaries are available, and the documentation describes installation from the project’s releases. · docs.joern.io, 8 Oct 2026
Integration
Joern can be used as a library or as a component through its REST API. · joern.io, 8 Oct 2026
Joern Scan
Joern Scan runs predefined queries against a program’s code property graph to report matched issues and their locations. · docs.joern.io, 8 Oct 2026
Language support
The documentation lists frontends for C/C++, Java, JavaScript, Python, x86/x64, JVM bytecode, Kotlin, PHP, Go, Ruby, Swift, and C# with varying maturity levels. · docs.joern.io, 8 Oct 2026
License
The repository identifies Joern as open source and includes an Apache-2.0 license. · github.com, 9 Oct 2026
License and support
The repository identifies Joern as open source under the Apache-2.0 license and links to a Discord community. · github.com, 8 Oct 2026
Operating system releases
The repository lists release distributions for Linux, macOS, and Windows, with x86_64 and ARM64 builds. · github.com, 9 Oct 2026
Operating systems
The project repository lists platform-specific distributions for Linux, macOS, and Windows, each with x86_64 and arm64 variants. · github.com, 8 Oct 2026
Purpose
Joern analyzes source code, bytecode, and binary executables to support vulnerability discovery and static program analysis. · docs.joern.io, 9 Oct 2026
Querying
Users can query code property graphs with a Scala-based domain-specific language. · docs.joern.io, 9 Oct 2026
Query language
Users can query code graphs with a strongly typed, extensible Scala-based domain-specific language. · docs.joern.io, 8 Oct 2026
Requirements
The repository lists JDK 21 as a requirement and says other versions may work but have not been properly tested. · github.com, 9 Oct 2026
Runtime requirement
The repository README lists JDK 21 as a requirement and says other versions may work but have not been properly tested. · github.com, 8 Oct 2026
Security limitation
The server documentation says its interpreter is not a security boundary and production environments must provide sandboxing by other means. · docs.joern.io, 9 Oct 2026

Where Joern stands on Freedom251

Look at these too