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JQ Essentials: Practical Guide
4 students
Created byTyler Adams
Last updated 12/2025
English

What you'll learn

  • Master core jq operations
  • Build jq workflows for real projects
  • Process data from command line
  • Apply practical techniques efficiently

Course content

1 section • 26 lectures • 2h 26m total length

  • Core Identity Primitive5:40
  • Core Identity Primitive Quiz
  • Compose filters with operator (|)5:39
  • Compose filters with operator (|)
  • Select fields with field access (.foo)5:03
  • Select fields with field access (.foo)
  • Boolean Operators: and, or, not7:52
  • Boolean Operators: and, or, not
  • Using value iterator (.[])4:44
  • Using value iterator (.[])
  • Collect results into arrays with []5:57
  • Collect results into arrays with []
  • Provide defaults with the alternative operator //5:43
  • Provide defaults with the alternative operator //
  • Concatenate Streams with the Comma Operator (,)6:39
  • Concatenate Streams with the Comma Operator (,)
  • Filter Streams with select()8:39
  • Filter Streams with select()
  • Index array elements with .[n]5:41
  • Index array elements with .[n]
  • Slice arrays and strings with .[start:end]4:40
  • Slice arrays and strings with .[start:end]
  • Transform arrays with map(expr)6:33
  • Transform arrays with map(expr)
  • Measure sizes with length3:11
  • Measure sizes with length
  • Optional operator (?) for tolerant selectors4:59
  • Optional operator (?) for tolerant selectors
  • Update values at paths with |= (update-assignment)6:10
  • Update values at paths with |= (update-assignment)
  • List object keys with keys()5:30
  • List object keys with keys()
  • Catch errors with try … catch7:52
  • Catch errors with try … catch
  • Construct objects with {}4:20
  • Construct objects with {}
  • Convert objects to pairs with to_entries5:51
  • Convert objects to pairs with to_entries
  • Build objects from pairs with from_entries6:13
  • Build objects from pairs with from_entries
  • Bulk-edit objects with with_entries4:32
  • Bulk-edit objects with with_entries
  • Check presence with has()4:56
  • Check presence with has()
  • Inspect types with type4:31
  • Inspect types with type
  • Delete paths with del()5:52
  • Delete paths with del()
  • Sort arrays of objects with sort_by(...)5:16
  • Sort arrays of objects with sort_by(...)
  • Group arrays with group_by(...)4:45
  • Group arrays with group_by(...)

Requirements

  • Basic knowledge of bash

Description

This course contains the use of artificial intelligence.


Wrangling JSON from APIs, logs, and config files can be slow and error-prone without the right tools. jq is powerful, but its syntax can feel cryptic when deadlines are tight. JQ Essentials: Practical Guide cuts through the noise so you can query, transform, and validate JSON confidently from the command line.


**Learn jq by building real queries you can paste into your terminal today.**


Across 26 concise lectures, you'll practice with bite-size datasets and challenges to master:

- Filter composition (|) to build readable pipelines

- Field access and slicing for nested data

- Boolean operators and comparisons for precise logic

- Array iteration to handle lists cleanly

- select() and map() to filter and transform collections

- sort_by() and group_by() for ordering and aggregation

- Object construction to reshape records

- Error handling with try-catch for robust scripts

- Update operators (|=) to modify values in place

- keys(), del(), and targeted edits

- to_entries/from_entries to pivot between objects and arrays

- Workflow habits: composing pipelines, testing, and refactoring


By the end, you'll turn messy JSON into clean reports, extract exactly what you need, and automate everyday data tasks in shell scripts and CI pipelines. Leave with a toolbox of copy-paste ready patterns and the confidence to use jq on real work tomorrow.

Who this course is for:

  • Developers working with command-line tools

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