JSON (JavaScript Object Notation) is a plain-text format for storing and sending data that is easy for both people and software to read. It organises information as a set of labels and values, such as a name paired with “Anna” or a price paired with 49.95, wrapped in a structure that any modern system can understand. It is the most common way for two pieces of software to exchange data over the internet.
A useful comparison is a parcel label. The box could go anywhere, but the label spells out the address, the weight and the contents in a fixed, predictable layout that every courier reads the same way. JSON is that label for data. When your website talks to your CRM through an API, the message travelling between them is almost always a block of JSON, and a REST API in particular returns it by default.
It is also human-friendly, which matters more than it sounds. A developer can open a JSON file and read it without special tools, which makes problems faster to spot and fix. For configuration that humans edit by hand, some teams prefer YAML, a close cousin with a cleaner look.
JSON does have edges that trip people up. It supports text, numbers, true and false, lists and nested objects, but not dates or comments, so dates usually travel as plain strings and notes live elsewhere. One missing comma or a stray trailing one will stop the whole message from parsing. That strictness is a feature: it means both sides agree on the exact shape, with no room to guess.
At TopDevs we use JSON as the common language between the systems we connect, so data moves cleanly between your tools without anything getting lost in translation.
