Introductions to JSON
Introducing JSON, provided by json.org
JSON - Introduction, provided by W3 Schools
An Introduction to JavaScript Object Notation (JSON) in JavaScript and .NET, provided by Microsoft Developer Network
JSON Tutorial, provided by tutorialspoint
JSON Tutorial: Learn JSON in 10 Minutes, provided by Beginners Book
JSON: What It Is, How It Works, & How to Use It, provided by Copter Labs
JSON editors / formatters / validators
JSON formatter & validator, provided by Curious Concept
C resources
Jansson is a C library for encoding and decoding JSON data; MIT license; created by Petri Lehtinen
JSON C/C++ Library for IoT Communication; Eclipse Public License; created by Real Time Logic
jon-parser and json-builder are a pair of libraries for parsing and serializing JSON data; author-issued copyright; created by James McLaughlin
jsmn (pronounced "jasmine"), a JSON parser (no builder) in C; written by Serge Zaitsev