diff --git a/src/schema/jsonify/bigint.ts b/src/schema/jsonify/bigint.ts
new file mode 100644
index 0000000..513eaa0
--- /dev/null
+++ b/src/schema/jsonify/bigint.ts
@@ -0,0 +1,28 @@
+import { identity } from "lodash-es"
+import { Opaque } from "type-fest"
+import { z } from "zod"
+
+
+export type JsonifiedBigInt = Opaque<string, "@thilawyn/schemable-class/JsonifiedBigInt">
+
+
+export function jsonifyBigIntSchema<S extends z.ZodBigInt>(schema: S) {
+    return schema.transform(v => v.toString() as JsonifiedBigInt)
+}
+
+export function dejsonifyBigIntSchema<S extends z.ZodBigInt>(schema: S) {
+    return z
+        .custom<JsonifiedBigInt>(identity)
+        .pipe(z
+            .string()
+            .transform(v => {
+                try {
+                    return BigInt(v)
+                }
+                catch (e) {
+                    return v
+                }
+            })
+            .pipe(schema)
+        )
+}
diff --git a/src/schema/jsonify/date.ts b/src/schema/jsonify/date.ts
new file mode 100644
index 0000000..a84dc61
--- /dev/null
+++ b/src/schema/jsonify/date.ts
@@ -0,0 +1,28 @@
+import { identity } from "lodash-es"
+import { Opaque } from "type-fest"
+import { z } from "zod"
+
+
+export type JsonifiedDate = Opaque<string, "@thilawyn/schemable-class/JsonifiedDate">
+
+
+export function jsonifyDateSchema<S extends z.ZodDate>(schema: S) {
+    return schema.transform(v => v.toString() as JsonifiedDate)
+}
+
+export function dejsonifyDateSchema<S extends z.ZodDate>(schema: S) {
+    return z
+        .custom<JsonifiedDate>(identity)
+        .pipe(z
+            .string()
+            .transform(v => {
+                try {
+                    return new Date(v)
+                }
+                catch (e) {
+                    return v
+                }
+            })
+            .pipe(schema)
+        )
+}
diff --git a/src/schema/jsonify/decimal.ts b/src/schema/jsonify/decimal.ts
new file mode 100644
index 0000000..4a4e67e
--- /dev/null
+++ b/src/schema/jsonify/decimal.ts
@@ -0,0 +1,33 @@
+import { Decimal } from "decimal.js"
+import { identity } from "lodash-es"
+import { Opaque } from "type-fest"
+import { z } from "zod"
+
+
+export type JsonifiedDecimal = Opaque<string, "@thilawyn/schemable-class/JsonifiedDecimal">
+
+
+export function jsonifyDecimalSchema<
+    S extends z.ZodType<Decimal, z.ZodTypeDef, Decimal>
+>(schema: S) {
+    return schema.transform(v => v.toJSON() as JsonifiedDecimal)
+}
+
+export function dejsonifyDecimalSchema<
+    S extends z.ZodType<Decimal, z.ZodTypeDef, Decimal>
+>(schema: S) {
+    return z
+        .custom<JsonifiedDecimal>(identity)
+        .pipe(z
+            .string()
+            .transform(v => {
+                try {
+                    return new Decimal(v)
+                }
+                catch (e) {
+                    return v
+                }
+            })
+            .pipe(schema)
+        )
+}
diff --git a/src/schema/jsonify/index.ts b/src/schema/jsonify/index.ts
new file mode 100644
index 0000000..753d3a3
--- /dev/null
+++ b/src/schema/jsonify/index.ts
@@ -0,0 +1,16 @@
+import { dejsonifyBigIntSchema, jsonifyBigIntSchema } from "./bigint"
+import { dejsonifyDateSchema, jsonifyDateSchema } from "./date"
+import { dejsonifyDecimalSchema, jsonifyDecimalSchema } from "./decimal"
+
+
+export const jsonify = {
+    bigint:   jsonifyBigIntSchema,
+    date:     jsonifyDateSchema,
+    decimal:  jsonifyDecimalSchema,
+}
+
+export const dejsonify = {
+    bigint:   dejsonifyBigIntSchema,
+    date:     dejsonifyDateSchema,
+    decimal:  dejsonifyDecimalSchema,
+}
diff --git a/src/tests.ts b/src/tests.ts
index 3a49e24..a43865c 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -1,6 +1,7 @@
 import { Implements, TraitExpression } from "@thilawyn/traitify-ts"
 import { z } from "zod"
 import { ZodSchemaClassBuilder } from "./ZodSchemaClass"
+import { dejsonify, jsonify } from "./schema/jsonify"
 import { ObservableZodSchemaObject } from "./traits/ObservableZodSchemaObject"
 
 
@@ -15,8 +16,12 @@ const newTestExp = new ZodSchemaClassBuilder(TraitExpression.NullSuperclass, [])
         defaultValues: { id: -1n },
     })
     .jsonifiable({
-        jsonifySchema: ({ schema }) => schema.extend({}),
-        dejsonifySchema: ({ schema }) => schema.extend({}),
+        jsonifySchema: ({ schema, shape }) => schema.extend({
+            id: jsonify.bigint(shape.id)
+        }),
+        dejsonifySchema: ({ schema, shape }) => schema.extend({
+            id: dejsonify.bigint(shape.id)
+        }),
     })
     .expresses(ObservableZodSchemaObject)
     .build()