feat: json field schemas (#5898)

test/fields/collections/JSON/index.tsx

@@ -18,6 +18,21 @@ const JSON: CollectionConfig = {
     {
       name: 'json',
       type: 'json',
+      jsonSchema: {
+        fileMatch: ['a://b/foo.json'],
+        schema: {
+          type: 'object',
+          properties: {
+            foo: {
+              enum: ['bar', 'foobar'],
+            },
+            number: {
+              enum: [10, 5],
+            },
+          },
+        },
+        uri: 'a://b/foo.json',
+      },
     },
   ],
   versions: {

test/fields/int.spec.ts

@@ -1247,6 +1247,17 @@ describe('Fields', () => {
       ).rejects.toThrow('The following field is invalid: json')
     })
 
+    it('should validate json schema', async () => {
+      await expect(async () =>
+        payload.create({
+          collection: 'json-fields',
+          data: {
+            json: { foo: 'bad' },
+          },
+        }),
+      ).rejects.toThrow('The following field is invalid: json')
+    })
+
     it('should save empty json objects', async () => {
       const jsonFieldsDoc = await payload.create({
         collection: 'json-fields',