diff --git a/invokeai/frontend/web/src/features/nodes/util/schema/parseFieldType.test.ts b/invokeai/frontend/web/src/features/nodes/util/schema/parseFieldType.test.ts
new file mode 100644
index 0000000000..2f4ce48a32
--- /dev/null
+++ b/invokeai/frontend/web/src/features/nodes/util/schema/parseFieldType.test.ts
@@ -0,0 +1,379 @@
+import {
+  UnableToExtractSchemaNameFromRefError,
+  UnsupportedArrayItemType,
+  UnsupportedPrimitiveTypeError,
+  UnsupportedUnionError,
+} from 'features/nodes/types/error';
+import type { InvocationFieldSchema, OpenAPIV3_1SchemaOrRef } from 'features/nodes/types/openapi';
+import { parseFieldType, refObjectToSchemaName } from 'features/nodes/util/schema/parseFieldType';
+import { describe, expect, it } from 'vitest';
+
+type ParseFieldTypeTestCase = {
+  name: string;
+  schema: OpenAPIV3_1SchemaOrRef | InvocationFieldSchema;
+  expected: { name: string; isCollection: boolean; isCollectionOrScalar: boolean };
+};
+
+const primitiveTypes: ParseFieldTypeTestCase[] = [
+  {
+    name: 'Scalar IntegerField',
+    schema: { type: 'integer' },
+    expected: { name: 'IntegerField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Scalar FloatField',
+    schema: { type: 'number' },
+    expected: { name: 'FloatField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Scalar StringField',
+    schema: { type: 'string' },
+    expected: { name: 'StringField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Scalar BooleanField',
+    schema: { type: 'boolean' },
+    expected: { name: 'BooleanField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Collection IntegerField',
+    schema: { items: { type: 'integer' }, type: 'array' },
+    expected: { name: 'IntegerField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Collection FloatField',
+    schema: { items: { type: 'number' }, type: 'array' },
+    expected: { name: 'FloatField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Collection StringField',
+    schema: { items: { type: 'string' }, type: 'array' },
+    expected: { name: 'StringField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Collection BooleanField',
+    schema: { items: { type: 'boolean' }, type: 'array' },
+    expected: { name: 'BooleanField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'CollectionOrScalar IntegerField',
+    schema: {
+      anyOf: [
+        {
+          type: 'integer',
+        },
+        {
+          items: {
+            type: 'integer',
+          },
+          type: 'array',
+        },
+      ],
+    },
+    expected: { name: 'IntegerField', isCollection: false, isCollectionOrScalar: true },
+  },
+  {
+    name: 'CollectionOrScalar FloatField',
+    schema: {
+      anyOf: [
+        {
+          type: 'number',
+        },
+        {
+          items: {
+            type: 'number',
+          },
+          type: 'array',
+        },
+      ],
+    },
+    expected: { name: 'FloatField', isCollection: false, isCollectionOrScalar: true },
+  },
+  {
+    name: 'CollectionOrScalar StringField',
+    schema: {
+      anyOf: [
+        {
+          type: 'string',
+        },
+        {
+          items: {
+            type: 'string',
+          },
+          type: 'array',
+        },
+      ],
+    },
+    expected: { name: 'StringField', isCollection: false, isCollectionOrScalar: true },
+  },
+  {
+    name: 'CollectionOrScalar BooleanField',
+    schema: {
+      anyOf: [
+        {
+          type: 'boolean',
+        },
+        {
+          items: {
+            type: 'boolean',
+          },
+          type: 'array',
+        },
+      ],
+    },
+    expected: { name: 'BooleanField', isCollection: false, isCollectionOrScalar: true },
+  },
+];
+
+const complexTypes: ParseFieldTypeTestCase[] = [
+  {
+    name: 'Scalar ConditioningField',
+    schema: {
+      allOf: [
+        {
+          $ref: '#/components/schemas/ConditioningField',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Nullable Scalar ConditioningField',
+    schema: {
+      anyOf: [
+        {
+          $ref: '#/components/schemas/ConditioningField',
+        },
+        {
+          type: 'null',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Collection ConditioningField',
+    schema: {
+      anyOf: [
+        {
+          items: {
+            $ref: '#/components/schemas/ConditioningField',
+          },
+          type: 'array',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Nullable Collection ConditioningField',
+    schema: {
+      anyOf: [
+        {
+          items: {
+            $ref: '#/components/schemas/ConditioningField',
+          },
+          type: 'array',
+        },
+        {
+          type: 'null',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: true, isCollectionOrScalar: false },
+  },
+  {
+    name: 'CollectionOrScalar ConditioningField',
+    schema: {
+      anyOf: [
+        {
+          items: {
+            $ref: '#/components/schemas/ConditioningField',
+          },
+          type: 'array',
+        },
+        {
+          $ref: '#/components/schemas/ConditioningField',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: false, isCollectionOrScalar: true },
+  },
+  {
+    name: 'Nullable CollectionOrScalar ConditioningField',
+    schema: {
+      anyOf: [
+        {
+          items: {
+            $ref: '#/components/schemas/ConditioningField',
+          },
+          type: 'array',
+        },
+        {
+          $ref: '#/components/schemas/ConditioningField',
+        },
+        {
+          type: 'null',
+        },
+      ],
+    },
+    expected: { name: 'ConditioningField', isCollection: false, isCollectionOrScalar: true },
+  },
+];
+
+const specialCases: ParseFieldTypeTestCase[] = [
+  {
+    name: 'String EnumField',
+    schema: {
+      type: 'string',
+      enum: ['large', 'base', 'small'],
+    },
+    expected: { name: 'EnumField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'String EnumField with one value',
+    schema: {
+      const: 'Some Value',
+    },
+    expected: { name: 'EnumField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Explicit ui_type (SchedulerField)',
+    schema: {
+      type: 'string',
+      enum: ['ddim', 'ddpm', 'deis'],
+      ui_type: 'SchedulerField',
+    },
+    expected: { name: 'SchedulerField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Explicit ui_type (AnyField)',
+    schema: {
+      type: 'string',
+      enum: ['ddim', 'ddpm', 'deis'],
+      ui_type: 'AnyField',
+    },
+    expected: { name: 'AnyField', isCollection: false, isCollectionOrScalar: false },
+  },
+  {
+    name: 'Explicit ui_type (CollectionField)',
+    schema: {
+      type: 'string',
+      enum: ['ddim', 'ddpm', 'deis'],
+      ui_type: 'CollectionField',
+    },
+    expected: { name: 'CollectionField', isCollection: true, isCollectionOrScalar: false },
+  },
+];
+
+describe('refObjectToSchemaName', async () => {
+  it('parses ref object 1', () => {
+    expect(
+      refObjectToSchemaName({
+        $ref: '#/components/schemas/ImageField',
+      })
+    ).toEqual('ImageField');
+  });
+  it('parses ref object 2', () => {
+    expect(
+      refObjectToSchemaName({
+        $ref: '#/components/schemas/T2IAdapterModelField',
+      })
+    ).toEqual('T2IAdapterModelField');
+  });
+});
+
+describe.concurrent('parseFieldType', async () => {
+  it.each(primitiveTypes)('parses primitive types ($name)', ({ schema, expected }) => {
+    expect(parseFieldType(schema)).toEqual(expected);
+  });
+  it.each(complexTypes)('parses complex types ($name)', ({ schema, expected }) => {
+    expect(parseFieldType(schema)).toEqual(expected);
+  });
+  it.each(specialCases)('parses special case types ($name)', ({ schema, expected }) => {
+    expect(parseFieldType(schema)).toEqual(expected);
+  });
+
+  it('raises if it cannot extract a schema name from a ref', () => {
+    expect(() =>
+      parseFieldType({
+        allOf: [
+          {
+            $ref: '#/components/schemas/',
+          },
+        ],
+      })
+    ).toThrowError(UnableToExtractSchemaNameFromRefError);
+  });
+
+  it('raises if it receives a union of mismatched types', () => {
+    expect(() =>
+      parseFieldType({
+        anyOf: [
+          {
+            type: 'string',
+          },
+          {
+            type: 'integer',
+          },
+        ],
+      })
+    ).toThrowError(UnsupportedUnionError);
+  });
+
+  it('raises if it receives a union of mismatched types (excluding null)', () => {
+    expect(() =>
+      parseFieldType({
+        anyOf: [
+          {
+            type: 'string',
+          },
+          {
+            type: 'integer',
+          },
+          {
+            type: 'null',
+          },
+        ],
+      })
+    ).toThrowError(UnsupportedUnionError);
+  });
+
+  it('raises if it received an unsupported primitive type (object)', () => {
+    expect(() =>
+      parseFieldType({
+        type: 'object',
+      })
+    ).toThrowError(UnsupportedPrimitiveTypeError);
+  });
+
+  it('raises if it received an unsupported primitive type (null)', () => {
+    expect(() =>
+      parseFieldType({
+        type: 'null',
+      })
+    ).toThrowError(UnsupportedPrimitiveTypeError);
+  });
+
+  it('raises if it received an unsupported array item type (object)', () => {
+    expect(() =>
+      parseFieldType({
+        items: {
+          type: 'object',
+        },
+        type: 'array',
+      })
+    ).toThrowError(UnsupportedArrayItemType);
+  });
+
+  it('raises if it received an unsupported array item type (null)', () => {
+    expect(() =>
+      parseFieldType({
+        items: {
+          type: 'null',
+        },
+        type: 'array',
+      })
+    ).toThrowError(UnsupportedArrayItemType);
+  });
+});