Jq Command Basics Online Course

Jq Command Basics Online Course

This course is designed to help you master the Jq command, a powerful tool for parsing and processing JSON data in Bash shell scripting. With an increasing reliance on REST APIs and JSON responses in DevOps automation, Jq simplifies JSON handling, making it easier to extract, filter, and format data in shell scripts. This beginner-friendly course covers everything from installing Jq and using basic filters to manipulating JSON objects, working with arrays, and integrating Jq with Kubernetes and system variables. By the end of this course, you will be proficient in using Jq for real-world JSON processing tasks, allowing you to automate workflows and optimize shell scripts effectively.

Key Benefits

• Beginner-Friendly & Hands-On – Learn Jq from scratch with real-world examples and exercises.
• Essential for DevOps & Automation – Master JSON parsing for REST API responses in Bash scripts.
• Boost Productivity – Use Jq to filter, format, and extract JSON data efficiently.
• Works Across Platforms – Compatible with Linux, macOS, and Unix environments.
• Integrate with Kubernetes – Learn how to use Jq with Kubectl for Kubernetes resource management.

Target Audience

• Bash shell scripting developers who need to process JSON data in automation workflows.
• DevOps engineers and IT professionals working with REST APIs and cloud infrastructure.
• Software developers looking to integrate JSON handling in their applications.
• System administrators managing JSON data in Linux/macOS environments.
• Anyone working with JSON data who wants to simplify data extraction and transformation.

Learning Objectives

By completing this course, you will:

• Understand the basics of Jq and its role in JSON processing.
• Learn how to parse and extract JSON data using Jq filters.
• Use Jq in Bash shell scripts to automate workflows.
• Format JSON output for readability and structured processing.
• Manipulate JSON arrays and objects using Jq commands.
• Work with advanced Jq functions, including map, select, and has.
• Integrate Jq with Kubernetes (Kubectl) for resource management.
• Use Jq with conditional statements, string operations, and arithmetic calculations.

Course Outline

The Jq Command Basics Exam covers the following topics - 

Module 1. Introduction to Jq and Course Overview

• Overview of Jq and its importance in JSON data processing.
• Understanding how Jq compares to other text-processing tools like sed and awk.
• Setting up prerequisites for using Jq in Bash shell scripting.
• Installing Jq on Linux and macOS, verifying the installation, and using the help command.
• Exploring public REST APIs to practice JSON parsing with Jq.
• Learning how Jq processes JSON inputs and outputs.

Module 2. Using Jq Filters and Options

• Identity filter: Understanding how to pass JSON data unchanged.
• Different methods to provide JSON input to Jq (files, standard input, etc.).
• Field filter: Extracting specific properties from JSON objects.
• Retrieving raw strings from JSON data using the raw output option.
• Combining field filters, commas, and raw output for custom JSON formatting.

Module 3. Implementing Jq in Bash Shell Scripts

• Writing Bash shell scripts to read and manipulate JSON data.
• Using Jq to retrieve usernames and passwords from API responses.
• Embedding Jq commands in shell scripts for automation.

Module 4. Handling JSON Arrays with Jq

• Learning how JSON arrays work and how to filter elements using Jq.
• Extracting specific elements from JSON arrays using indexing.
• Slicing JSON arrays to retrieve portions of the data.

Module 5. Constructing JSON Objects and Arrays Using Jq

• Creating JSON objects and arrays from scratch with Jq.
• Building JSON data structures with and without input values.
• Defining JSON fields including null, numbers, strings, and boolean values.
• Using the --tab and -c options to format JSON output for readability.

Module 6. Advanced Jq Functions and Pipes

• Introduction to Jq functions and how they work with filters.
• Using join and range functions to manipulate JSON data.
• Applying the has function to check for the existence of keys in JSON.
• Using map and select functions to filter JSON objects dynamically.

Module 7. Working with Environment Variables in Jq

• Understanding environment variables in Linux/macOS.
• Using the env object and export command to pass system variables to Jq.
• Working with --arg option to pass custom variables into Jq.
• Exploring string manipulation functions like tostring, ascii_upcase, and ascii_downcase.
• Using variables with filters and conditional expressions in Jq.

Module 8. Conditional Statements in Jq

• Implementing if statements to apply conditional logic on JSON data.
• Using if-else and elif (else if) conditions to handle multiple scenarios.
• Filtering JSON objects based on conditions and logical comparisons.

Module 9. Handling Jq Command Exit Status in Shell Scripts

• Understanding Jq exit status codes and how they impact scripts.
• Handling success and failure scenarios in Bash shell scripting.

Module 10. String Operations Using Jq

• Concatenating multiple string values in JSON objects.
• Encoding and decoding JSON strings efficiently.

Module 11. Performing Arithmetic Operations with Jq

• Using Jq for basic arithmetic calculations on JSON numbers.
• Handling integer and floating-point operations.

Module 12. Converting JSON Arrays to Bash Arrays

• Extracting JSON array elements and storing them in Bash arrays.
• Using Bash loops to iterate over JSON data.

Module 13. Integrating Jq with Kubernetes (Kubectl)

• Fetching Kubernetes pod, deployment, and service details using Jq.
• Extracting specific fields from Kubectl JSON output for automation.