When you work with web services and APIs that are created as REST services, you'll need to work with JavaScript Object Notation (JSON) data. JSON is a lightweight file format that is used for storing and exchanging data between clients. It's an open standard format that is based on a collection of key/value pairs. JSON uses the JavaScript syntax, but its format is text only. This text can be read and used as a data format by any programming language.
AL in Business Central also has built-in support for working with JSON data. These JSON classes are used for simple data transfer. You can't use the JSON data types as a data type for fields in a table, but you can create variables with the JSON data types.
These classes are an implementation of the System.Json classes from the .NET Framework:
JsonToken
JsonArray
JsonObject
JsonValue
All JSON types are reference types, not value types.
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