jq is a command-line JSON processor that parses and transforms JSON data using a specialized query language.
The tool solves the problem of extracting, filtering, and reshaping JSON data in shell scripts and command pipelines. Rather than writing custom parsing code or relying on multiple text processing tools, jq provides a dedicated language for JSON manipulation. Users write filter expressions that operate on JSON input, selecting fields, applying transformations, and producing formatted output. The language supports recursive descent, array and object iteration, conditionals, variable binding, and function definitions, allowing both simple field extraction and complex data transformations in a single expression.
jq suits developers and system administrators who work with JSON APIs, configuration files, or log data in terminal environments. It is particularly valuable in shell scripts where JSON processing would otherwise require external language interpreters or verbose custom code. The tool works well for ad-hoc data exploration, extracting specific fields from API responses, filtering arrays, and reformatting JSON for consumption by other tools. It integrates naturally into Unix pipelines, accepting JSON on standard input and producing JSON or text output.
The project maintains active development with regular commits addressing bug fixes and feature additions. Pull requests receive timely review and feedback from maintainers. The codebase shows consistent attention to test coverage, with updates to test suites accompanying new functionality. Documentation is actively maintained, with README and manual pages kept current with language features. The project responds to reported issues with investigation and resolution, indicating ongoing engagement with the user community.
