jpx

Write JMESPath expressions to query and transform JSON. Use when extracting, filtering, projecting, or reshaping JSON data. Covers identifiers, projections, filters, multi-select, pipes, functions, and let expressions. Works with any JMESPath implementation.

Run jpx to query and transform JSON from the command line. Covers output formats (CSV, TSV, table, YAML), streaming NDJSON, input modes (slurp, raw-input, null-input), query files, variable binding, and shell pipelines. Use when building shell pipelines or exporting JSON data.

Look up and call the 460+ extension functions in jpx beyond standard JMESPath. Covers array, string, math, datetime, hash, encoding, regex, object, expression (higher-order), geo, text, validation, and 20+ more categories. Use when a task needs functions beyond the 26 standard JMESPath built-ins.

Invoke jpx MCP server tools for JMESPath evaluation, function discovery, JSON utilities, and cross-server tool discovery. Use when evaluating expressions via MCP, exploring functions, analyzing JSON structure, or managing named queries.