3.1. analyzer.json

The current version of the analyzer.json specification is 1.0.0. This version supports the following fields in the top-level JSON object:


The name of the analyzer. All analyzers must belong to an org, e.g. r2c/transpiler.


The name of the author.


A contact address for the author.


The semantic version string representing the current analyzer version.


Analyzer versions are used for caching and result correctness. A given version of a deterministic analyzer run on the same input is expected to always produce the same result. One consequence of this is that you cannot overwrite or push multiple of the same version for a given analyzer.


The version of the analyzer specification this analyzer is compatible with. To match the version of the documented on this page, this should always be 1.0.0.


This is the main mechanism by which analyzers interact with other analysis components in the r2c system. Each key in this object is the name of another analyzer, such as r2c/transpiler. Each value is the version of the analyzer you want to use. An analyzer’s output for the same input (commit or repository) appears under its name in /analysis/inputs when your container runs, e.g. /analysis/inputs/r2c/transpiler.

Analyzers are expected to follow semantic versioning <https://semver.org/>. You can depend on a specific version, or on * to keep up to date with the latest. To keep your analyzer deterministic, we highly recommend depending on a specific version. Semver caret and tilde ranges like ~1.1.0 or ^1.1.0 are allowed, but discouraged.

type“constant”, “commit”, or “git”

The type of input for which this analyzer produces a unique output.

  • A constant analyzer always produces the same output. This can be useful for the trained data for a machine learning based analysis, by having the analyzer depend on its trained weights separately from the actual analysis.

  • A commit analyzer produces output for a JavaScript project at a specific point in its history, a single instance of code. This analyzer should not expect to make use of any version control features. Most analyzers are commit anlayzers.

  • A git analyzer understands the evolution and history of a repository. It produces unique outputs for an entire commit graph or bare git checkout. These analyzers can directly compare trends in a project.

output“json”, “filesystem”, or “both”

The type of output this analyzer produces.

  • json output is the most common output format. For the structure of the resulting JSON, see JSON Results.

  • filesystem output allows the analyzer to output an arbitrary directory and file structure. Hard links are not supported. These analyzers may do such things as transpile code, install dependencies, or produce binary or other data from an analysis that would not be serializable as JSON. They lose the benefit of parts of the r2c toolchain that understand the JSON format, so most analysis should eventually end up as JSON.

  • The both value indicates that both json and filesystem output appear together. This is useful for describing properties of the filesystem output to query the results.


The current version of the r2c platform does not support non-deterministic analyzers. However, this feature is a part of the analyzer specifciation version 1.0.0 and will be implemneted soon.