liveBook · Manning

JSON string

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

A JSON string is a string value represented using JSON string syntax and enclosed in double quotes.

A JSON string is text enclosed in double quotes. Quotation marks determine the type: "5", "true", and "null" are strings, not a number, Boolean, or null value. section 24.2.1

{
  "interface_name": "GigabitEthernet1/1",    #1
  "is_up": true,                             #2
  "ip_address": "192.168.1.1",               #3
  "netmask": "255.255.255.0",                #4
  "speed": 1000,                             #5
  "description": null                        #6
}

Use the listing to distinguish JSON strings from Boolean, numeric, and null values in a device-status object. section 24.2.1

Strings in API data

A Catalyst Center token response places the access token inside double quotes, making it a JSON string. Inventory data similarly represents fields such as hostname, MAC address, software version, and serial number as strings. section 23.3.3

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines double-quote delimiters and type distinctions, stopping short of detailed string escaping rules.
Examples
Uses quoted numbers, Boolean words, null, interface data, API tokens, hostnames, addresses, and software versions.
What it assumes
Assumes basic JSON notation while teaching primitive data-type distinctions and quoted-value interpretation.
What you can do after
Evaluate JSON values by recognizing whether double quotes make their contents strings rather than other data types.
How it connects
Connects JSON strings with JSON objects, numbers, Boolean values, null, arrays, and REST APIs.

Related concepts

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.