Correct order of JSON:API members in generated swagger.json

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/NullableResourceIdentifierResponseDocument.cs

@@ -13,13 +13,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class NullableResourceIdentifierResponseDocument<TResource> : NullableSingleData<ResourceIdentifierObject<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceIdentifierDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/NullableSecondaryResourceResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class NullableSecondaryResourceResponseDocument<TResource> : NullableSingleData<ResourceObjectInResponse<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/PrimaryResourceResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class PrimaryResourceResponseDocument<TResource> : SingleData<ResourceObjectInResponse<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/ResourceCollectionResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class ResourceCollectionResponseDocument<TResource> : ManyData<ResourceObjectInResponse<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceCollectionDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/ResourceIdentifierCollectionResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class ResourceIdentifierCollectionResponseDocument<TResource> : ManyData<ResourceIdentifierObject<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceIdentifierCollectionDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/ResourceIdentifierResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class ResourceIdentifierResponseDocument<TResource> : SingleData<ResourceIdentifierObject<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceIdentifierDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Documents/SecondaryResourceResponseDocument.cs

@@ -11,13 +11,13 @@ namespace JsonApiDotNetCore.OpenApi.JsonApiObjects.Documents;
 internal sealed class SecondaryResourceResponseDocument<TResource> : SingleData<ResourceObjectInResponse<TResource>>
     where TResource : IIdentifiable
 {
-    [JsonPropertyName("meta")]
-    public IDictionary<string, object> Meta { get; set; } = null!;
-
     [JsonPropertyName("jsonapi")]
     public JsonapiObject Jsonapi { get; set; } = null!;
 
     [Required]
     [JsonPropertyName("links")]
     public LinksInResourceDocument Links { get; set; } = null!;
+
+    [JsonPropertyName("meta")]
+    public IDictionary<string, object> Meta { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Links/LinksInResourceIdentifierCollectionDocument.cs

@@ -11,13 +11,13 @@ internal sealed class LinksInResourceIdentifierCollectionDocument
     [JsonPropertyName("self")]
     public string Self { get; set; } = null!;
 
-    [JsonPropertyName("describedby")]
-    public string Describedby { get; set; } = null!;
-
     [Required]
     [JsonPropertyName("related")]
     public string Related { get; set; } = null!;
 
+    [JsonPropertyName("describedby")]
+    public string Describedby { get; set; } = null!;
+
     [Required]
     [JsonPropertyName("first")]
     public string First { get; set; } = null!;

src/JsonApiDotNetCore.OpenApi/JsonApiObjects/Links/LinksInResourceIdentifierDocument.cs

@@ -11,10 +11,10 @@ internal sealed class LinksInResourceIdentifierDocument
     [JsonPropertyName("self")]
     public string Self { get; set; } = null!;
 
-    [JsonPropertyName("describedby")]
-    public string Describedby { get; set; } = null!;
-
     [Required]
     [JsonPropertyName("related")]
     public string Related { get; set; } = null!;
+
+    [JsonPropertyName("describedby")]
+    public string Describedby { get; set; } = null!;
 }

src/JsonApiDotNetCore.OpenApi/JsonApiPropertyName.cs

@@ -0,0 +1,17 @@
+#pragma warning disable AV1008 // Class should not be static
+
+namespace JsonApiDotNetCore.OpenApi;
+
+internal static class JsonApiPropertyName
+{
+    public const string Jsonapi = "jsonapi";
+    public const string Links = "links";
+    public const string Data = "data";
+    public const string Type = "type";
+    public const string Id = "id";
+    public const string Attributes = "attributes";
+    public const string Relationships = "relationships";
+    public const string Errors = "errors";
+    public const string Included = "included";
+    public const string Meta = "meta";
+}

src/JsonApiDotNetCore.OpenApi/SwaggerComponents/JsonApiSchemaGenerator.cs

@@ -34,6 +34,16 @@ internal sealed class JsonApiSchemaGenerator : ISchemaGenerator
         typeof(NullableToOneRelationshipInRequest<>)
     };
 
+    private static readonly string[] DocumentPropertyNamesInOrder =
+    {
+        JsonApiPropertyName.Jsonapi,
+        JsonApiPropertyName.Links,
+        JsonApiPropertyName.Data,
+        JsonApiPropertyName.Errors,
+        JsonApiPropertyName.Included,
+        JsonApiPropertyName.Meta
+    };
+
     private readonly ISchemaGenerator _defaultSchemaGenerator;
     private readonly ResourceObjectSchemaGenerator _resourceObjectSchemaGenerator;
     private readonly NullableReferenceSchemaGenerator _nullableReferenceSchemaGenerator;
@@ -76,7 +86,7 @@ public OpenApiSchema GenerateSchema(Type modelType, SchemaRepository schemaRepos
             }
         }
 
-        return _defaultSchemaGenerator.GenerateSchema(modelType, schemaRepository, memberInfo, parameterInfo);
+        return _defaultSchemaGenerator.GenerateSchema(modelType, schemaRepository, memberInfo, parameterInfo, routeInfo);
     }
 
     private static bool IsJsonApiDocument(Type type)
@@ -100,7 +110,9 @@ private OpenApiSchema GenerateJsonApiDocumentSchema(Type documentType)
             ? CreateArrayTypeDataSchema(referenceSchemaForResourceObject)
             : referenceSchemaForResourceObject;
 
-        fullSchemaForDocument.Properties[JsonApiObjectPropertyName.Data] = referenceSchemaForDataObject;
+        fullSchemaForDocument.Properties[JsonApiPropertyName.Data] = referenceSchemaForDataObject;
+
+        fullSchemaForDocument.ReorderProperties(DocumentPropertyNamesInOrder);
 
         return referenceSchemaForDocument;
     }
@@ -120,8 +132,8 @@ private static bool IsDataPropertyNullableInDocument(Type documentType)
     private void SetDataObjectSchemaToNullable(OpenApiSchema referenceSchemaForDocument)
     {
         OpenApiSchema fullSchemaForDocument = _schemaRepositoryAccessor.Current.Schemas[referenceSchemaForDocument.Reference.Id];
-        OpenApiSchema referenceSchemaForData = fullSchemaForDocument.Properties[JsonApiObjectPropertyName.Data];
-        fullSchemaForDocument.Properties[JsonApiObjectPropertyName.Data] = _nullableReferenceSchemaGenerator.GenerateSchema(referenceSchemaForData);
+        OpenApiSchema referenceSchemaForData = fullSchemaForDocument.Properties[JsonApiPropertyName.Data];
+        fullSchemaForDocument.Properties[JsonApiPropertyName.Data] = _nullableReferenceSchemaGenerator.GenerateSchema(referenceSchemaForData);
     }
 
     private static OpenApiSchema CreateArrayTypeDataSchema(OpenApiSchema referenceSchemaForResourceObject)

src/JsonApiDotNetCore.OpenApi/SwaggerComponents/OpenApiSchemaExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.OpenApi.Models;
+
+namespace JsonApiDotNetCore.OpenApi.SwaggerComponents;
+
+internal static class OpenApiSchemaExtensions
+{
+    public static void ReorderProperties(this OpenApiSchema fullSchemaForResourceObject, IEnumerable<string> propertyNamesInOrder)
+    {
+        var propertiesInOrder = new Dictionary<string, OpenApiSchema>();
+
+        foreach (string propertyName in propertyNamesInOrder)
+        {
+            if (fullSchemaForResourceObject.Properties.TryGetValue(propertyName, out OpenApiSchema? schema))
+            {
+                propertiesInOrder.Add(propertyName, schema);
+            }
+        }
+
+        if (fullSchemaForResourceObject.Properties.Count != propertiesInOrder.Count)
+        {
+            throw new UnreachableCodeException();
+        }
+
+        fullSchemaForResourceObject.Properties = propertiesInOrder;
+    }
+}

src/JsonApiDotNetCore.OpenApi/SwaggerComponents/ResourceFieldObjectSchemaBuilder.cs

@@ -23,6 +23,13 @@ internal sealed class ResourceFieldObjectSchemaBuilder
         typeof(NullableToOneRelationshipInResponse<>)
     };
 
+    private static readonly string[] RelationshipObjectPropertyNamesInOrder =
+    {
+        JsonApiPropertyName.Links,
+        JsonApiPropertyName.Data,
+        JsonApiPropertyName.Meta
+    };
+
     private readonly ResourceTypeInfo _resourceTypeInfo;
     private readonly ISchemaRepositoryAccessor _schemaRepositoryAccessor;
     private readonly SchemaGenerator _defaultSchemaGenerator;
@@ -156,7 +163,7 @@ private void GenerateResourceIdentifierObjectSchema(Type resourceIdentifierObjec
             _schemaRepositoryAccessor.Current.Schemas[referenceSchemaForResourceIdentifierObject.Reference.Id];
 
         Type resourceType = resourceIdentifierObjectType.GetGenericArguments()[0];
-        fullSchemaForResourceIdentifierObject.Properties[JsonApiObjectPropertyName.Type] = _resourceTypeSchemaGenerator.Get(resourceType);
+        fullSchemaForResourceIdentifierObject.Properties[JsonApiPropertyName.Type] = _resourceTypeSchemaGenerator.Get(resourceType);
     }
 
     private void AddRelationshipSchemaToResourceObject(RelationshipAttribute relationship, OpenApiSchema fullSchemaForRelationshipsObject)
@@ -194,13 +201,14 @@ private OpenApiSchema CreateRelationshipSchema(Type relationshipSchemaType)
 
         if (IsDataPropertyNullableInRelationshipSchemaType(relationshipSchemaType))
         {
-            fullSchema.Properties[JsonApiObjectPropertyName.Data] =
-                _nullableReferenceSchemaGenerator.GenerateSchema(fullSchema.Properties[JsonApiObjectPropertyName.Data]);
+            fullSchema.Properties[JsonApiPropertyName.Data] = _nullableReferenceSchemaGenerator.GenerateSchema(fullSchema.Properties[JsonApiPropertyName.Data]);
         }
 
         if (IsRelationshipInResponseType(relationshipSchemaType))
         {
-            fullSchema.Required.Remove(JsonApiObjectPropertyName.Data);
+            fullSchema.Required.Remove(JsonApiPropertyName.Data);
+
+            fullSchema.ReorderProperties(RelationshipObjectPropertyNamesInOrder);
         }
 
         return referenceSchema;