jc CLI
jc converts command output, files and strings into JSON with dedicated parsers for use in scripts and downstream tools.
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Extended access
Why this level
- Input and JSON can contain internal data, and shorthand executes the supplied user command.
Install
In your terminal, with SkillFoxx CLI
npx skillfoxx add cli/jcDetects the agents on your machine, shows the access level and pins the version.
Other ways to install
Access and checks
How we reviewExtended accessThe tool runs code or makes network calls and only reads external data.
- Input and JSON can contain internal data, and shorthand executes the supplied user command.
This is third-party code. Review the repository files before installing.
What it does
Select a parser for the source command or file instead of splitting text columns. jc reads input and returns named JSON fields for scripts to filter. Parsing ls, for example, gives a script separate file name, owner and size fields. In a normal pipeline, jc reads existing text. Shorthand makes jc run the specified command and parse its output. By default, parsers convert recognized numbers and booleans to JSON types; raw mode returns data before that processing. Each parser documents its own schema and fields.
Who it is for. System-script authors needing named JSON fields rather than fragile text-column splitting.
Good fit when
- Convert textual diagnostics to JSON for an agent.
- Select named fields with jq in a shell script.
- Add a supported file format to structured processing.
- Compare source and normalized values on a test sample.
Not a fit when
- The input format has no suitable verified parser.
- Shorthand must run a shell alias or builtin.
- JSON would be trusted without checking schema or parsing errors.
Example request
Choose a jc parser for our diagnostic output, show its schema and verify types on a test sample.Limitations
Input must match the selected parser’s format; compare a source sample with the resulting fields before automation. Shorthand cannot resolve shell aliases or builtins, so pipe their output instead. Most parsers load the entire input before producing JSON; choose a streaming parser for a continuing stream. Suppressing streaming parser errors with -qq can hide skipped records even when the remaining output is valid JSON.
How to disable. Remove jc from the pipeline and stop any still-running source command. Created JSON files remain separate results.
FAQ
Does jc run the source command?
In shorthand mode, yes. A normal pipeline only supplies text to it.
Where are output fields documented?
Open the selected parser’s help, for example `jc -h --dig`. It lists output fields and examples; other parsers use different schemas.
What does -r change?
`-r` skips final field processing. In the ls parser example, size 6 becomes `"size": 6` normally and `"size": "6"` with the flag. Numeric comparison in jq needs the former or an explicit string conversion.
How do I handle a shell alias?
Run it in the shell and pipe its output; jc shorthand does not resolve aliases.
What happens with a large stream?
A streaming parser processes records as they arrive; `--ping-s`, for example, handles ping output. Avoid -qq when skipped records must remain visible.
Discussion
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README in short
`jc -ap` lists parsers and compatibility information. Parser details are available from the CLI without using the Python API or Ansible.