When you make a GET call to a server-side API, which format is data returned in?

When you make a GET call to any of Klaviyo's server-side (RESTful) APIs, the response body is always returned in JSON (JavaScript Object Notation) format. Why JSON is the Standard. JSON is the industry-standard for data exchange because it is both human-readable and easy for machines to parse. In the context of Klaviyo’s modern APIs (v3 and beyond), the responses strictly adhere to the JSON:API specification. Structure: Data is organized into a data object, which contains attributes (the specific fields like a profile's email) and links for pagination. Interoperability: Because JSON is language-independent, you can easily handle these responses in Python, Node.js, PHP, or any other backend language. Predictability: Whether you are fetching a list of profiles or a specific metric's performance, you can rely on the same nested key-value structure.