jq

Parse, filter, and transform JSON data from the command line.

Updated Jul 2, 2024
One-click install
npx skills add https://github.com/jyasuu/cheat-sheet --skill jq-jyasuu
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: jq
Source: https://github.com/jyasuu/cheat-sheet/tree/main/skills/jq
Command: npx skills add https://github.com/jyasuu/cheat-sheet --skill jq-jyasuu

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

jq is a lightweight command-line JSON processor that enables you to filter, transform, and extract data from JSON efficiently, turning verbose data into actionable insights.

Core Features & Use Cases

  • Filtering & Transformation: select fields, access nested data, and reshape structures to deliver just the information you need.
  • Array & Data Manipulation: map, reduce, and compute aggregates across JSON arrays, enabling quick analytics directly in the shell.
  • Real-world Scenarios: quickly extract user names and IDs from API responses, or normalize nested records for reporting.

Quick Start

Pipe a JSON document into jq and extract the value of a target field.

Frequently Asked Questions about jq

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I filter and extract specific fields from a JSON file in the shell?

To filter JSON data in the shell, you can pipe a JSON document into a command-line processor to select specific fields and access nested data. This approach allows you to extract precise information from API responses or config files without writing a full script.

What is the best way to transform and reshape nested JSON structures?

The best way to transform nested JSON structures is using a lightweight command-line JSON processor. It enables you to reshape structures, map arrays, and compute aggregates, turning verbose nested records into normalized, actionable data for quick analytics.

Can I compute aggregates across JSON arrays directly from the command line?

Yes, you can compute aggregates across JSON arrays directly from the command line. By using jq's array manipulation operators like map and reduce, you can perform quick data analytics and calculate values without needing to import the data into a separate database.

Does this JSON processing approach work for API responses and log data?

Yes, this JSON processing approach works effectively for API responses and log data. It is designed for data extraction and transformation across these formats, allowing you to parse verbose inputs and obtain precise results quickly.

How do I parse and access deeply nested fields in JSON data?

To parse and access deeply nested fields in JSON data, you can use robust path traversal operators in a command-line JSON processor. This allows you to navigate complex hierarchical structures and extract targeted values efficiently.

What are the limitations of using a command-line JSON processor for large data?

Using a command-line JSON processor for large data is generally intended for lightweight, scriptable manipulation. While it handles quick analytics and data extraction well, processing extremely large JSON files may be constrained by available shell memory and streaming capabilities.