![]() ![]() The beauty of such references lies in the fact that the value is an URI, which may not only refer to local definitions (declared in the same file), but also definitions from other files. This is our way of choice to still obey DRY. The $ref field puts the given reference in place by bringing in all defined properties of the referenced definition. The description could be helpful when validation fails or when the schema forms the basis for autocomplete in an editor.Ī schema may be as trivial as the following code, which just specifies a JSON that should be a single string. The allowed values (for an enumeration, enum)īesides these obvious (and some not so obvious) constraints we may also include some metadata like a description of the field.In a recursive manner this definition is also performed in a JSON file. We'll see that this is for a reason as not all changes may be appreciated by everyone.įirst let's start with the fundamentals of JSON schema, i.e., things that work across v3 and v4 and can be considered basic for any JSON schema.Ī JSON schema defines the contents of a JSON file. Even today many systems still rely on this version instead of updating to a more recent draft. The third iteration of the JSON schema specification was a great success. We'll go into the differences of these two specifications in the next two sections. The JSON schema specification rather consists of different versions with the most used ones being the earlier v3 and the current v4 specification. One of the major problems is that there is no single point of information. The official website hosts the specification and some examples. JSON schema is a format that may be used to formalize constraints and requirements to JSON files. That being said: Full throttle ahead! Let's explore JSON schema. Since JSON schema is defined in form of a JSON schema we can also use the editor to edit the schema itself. Our goal is to write a graphical JSON editor based on a given schema. What we will do in this article is to have a closer look at JSON schema, it's properties, available libraries, and short comings. How to offer an editor that allows creating configuration files without duplicating codeĪs the interested reader may guess JSON schema solved these problems for me.How to support multiple versions without being in a dependency hell.How to inform users about missing or invalid parts.How to check or validate the input in a flexible way.The problems I faced immediately were as follows: The configuration was supplied in form of a JSON file. Recently I created an application that required a sophisticated condition configuration to run properly. The migration from v4 to v6 and the differences to v7 will be explained in future revisions of this article. I will also try to update the content accordingly, as at the time of writing v4 was the most current spec. BackgroundĪctually, I wrote this article over 1 year ago - but I never found the time to publish it. One of the most important sections will then discuss the differences between the various versions of the JSON schema specification. Hell, there is even a JSON schema that describes how a JSON schema file should look like.īefore going into details of JSON schema we will take a quick look at my own background related to JSON schema files. One of the best parts of JSON schema is that it is full y written in JSON. Also everything can be described and enhanced with some additional information that may be displayed in some help text. Without a schema JSON files could - by definition - contain arbitrary data.īesides the advantage of putting some boundaries and requirements to JSON files we also have another immediate benefit from creating a JSON schema file: We can help users to understand what options are available and how the structures need to look to be right. ![]() We will see the JSON schema is very useful to put some constraints on a JSON file. To fully understand the code we need to have some proper introduction to JSON schema. In this article we'll look into creating an awesome JSON schema editor using WPF.
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