Codezoom

Multi-level code structure explorer — interactive drill-down HTML visualizations.

Codezoom generates a standalone HTML file that lets you explore a project's structure at multiple levels of detail. Click any node to drill down; use breadcrumb navigation to go back up.

What it visualizes

Level	Python	Java	Rust
1. External dependencies	Direct and transitive packages from pyproject.toml + uv.lock	Direct and transitive Maven dependencies from pom.xml (requires jgo)	Direct and transitive crates via cargo metadata
2. Package/module hierarchy	Sub-packages and modules via pydeps (with file-tree fallback) — includes inter-module imports	Package tree via jdeps — includes inter-package dependencies and class-level call graphs	Module tree via rustdoc JSON — includes inter-module import edges
3. Module/class internals	Functions and classes extracted from AST — shows visibility (public/private based on naming)	Classes, interfaces, enums, and nested classes extracted from compiled bytecode via javap — shows visibility (public/protected/private/package)	Structs, enums, traits, and functions extracted from rustdoc JSON — shows visibility (public/pub(crate)/private)
4. Class/method internals	Methods and their call relationships extracted from AST	Methods with parameter signatures and call relationships extracted from bytecode	Methods with call relationships extracted from source via tree-sitter (requires codezoom[rust])

Examples

External dependencies (Python)	External dependencies (Java)
Project submodules	A submodule's children
Single-file view (Python)	Single-file view (Java)

Installation

Installing codezoom with uv

uv tool install codezoom

Installing codezoom with pip

pip install codezoom

Installing codezoom from source

git clone https://github.com/apposed/codezoom
uv tool install --with-editable codezoom codezoom

When installed in this fashion, changes to the codezoom source code will be immediately reflected when running codezoom from the command line.

Using codezoom as a dependency

uv add codezoom

or

pixi add --pypi codezoom

Not sure which to use? Read this.

Usage

Basic usage (auto-detects Python, Java, or Rust):

codezoom /path/to/project                     # auto-detect, output to codezoom.html
codezoom /path/to/project -o output.html      # custom output path
codezoom /path/to/project --name "My Project" # custom display name
codezoom /path/to/project --open              # open in browser after generating

Python projects

# Basic usage - requires pyproject.toml
codezoom /path/to/python/project

# For richer module analysis, install the python extra
pip install codezoom[python]
codezoom /path/to/python/project --open

Java projects

# Compile the project first
cd /path/to/java/project
mvn compile

# Generate visualization (basic - no Maven dependencies)
codezoom . --open

# For full dependency analysis, install jgo
pip install codezoom[java]
codezoom . --open

Rust projects

# cargo metadata is used automatically if cargo is in PATH
codezoom /path/to/rust/project

# For call graph extraction, install the rust extra
pip install codezoom[rust]
codezoom /path/to/rust/project --open

Note: module hierarchy and symbol extraction require the Rust nightly toolchain:

rustup toolchain install nightly

Also works as a module:

python -m codezoom /path/to/project

Requirements

Core

• Python 3.11+
• No mandatory runtime dependencies beyond the standard library

For Python projects

• Optional: pydeps for richer module-level import analysis (falls back to file-tree scanning without it)

  pip install codezoom[python]

For Java projects

• JDK (not just JRE) — provides jdeps and javap for package/class analysis
• Compiled code — run mvn compile before analyzing
• Optional: jgo for Maven dependency extraction

  pip install codezoom[java]

For Rust projects

• cargo — for dependency extraction via cargo metadata
• Rust nightly toolchain — for module hierarchy and symbol extraction

  rustup toolchain install nightly

• Optional: tree-sitter for call graph extraction

  pip install codezoom[rust]

Per-project configuration

Projects can include a .codezoom.toml or a [tool.codezoom] section in pyproject.toml:

[tool.codezoom]
exclude = ["tests", "docs", "__pycache__"]

The exclude list is passed to pydeps via -xx to omit modules from the hierarchy.

Language support

Python

• Detection: Presence of pyproject.toml
• Project layouts: Both src/ layout and flat layout
• Dependencies: Extracted from pyproject.toml and uv.lock
• Hierarchy: Module tree via pydeps (falls back to file tree)
• Symbols: Functions, classes, and methods via AST parsing
• Call graphs: Method calls extracted from AST
• Visibility: Public/private based on Python naming conventions (_private, __dunder__)
• Configuration: Via .codezoom.toml or [tool.codezoom] in pyproject.toml

Java

• Detection: Presence of pom.xml or build.gradle.kts or build.gradle
• Prerequisites:
  • JDK installed (for jdeps and javap)
  • Project compiled (mvn compile or ./gradlew build)
  • pip install codezoom[java] for dependency extraction
• Dependencies: Maven dependencies via jgo (direct + transitive with scope filtering)
• Hierarchy: Package tree via jdeps with inter-package dependencies
• Class dependencies: Class-to-class and class-to-package relationships via javap
• Symbols: Classes, interfaces, enums, nested classes via bytecode analysis
• Call graphs: Method invocations extracted from bytecode
• Visibility: Full Java visibility (public, protected, private, package-private)
• Limitations: Bridge methods are filtered out; requires compiled .class files

Rust

• Detection: Presence of Cargo.toml
• Prerequisites:
  • cargo installed (for dependency extraction)
  • Rust nightly toolchain for module hierarchy and symbols: rustup toolchain install nightly
  • pip install codezoom[rust] for call graph extraction
• Dependencies: Crate dependencies via cargo metadata (direct + transitive, normal deps only)
• Hierarchy: Module tree via rustdoc JSON — includes inter-module import edges
• Symbols: Structs, enums, traits, and functions extracted from rustdoc JSON
• Call graphs: Method invocations extracted from source via tree-sitter
• Visibility: public, pub(crate)/pub(super), private

License

UNLICENSE - All copyright disclaimed.