diff --git a/package.json b/package.json
index 6d0c2cff..ae5190e8 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "@jsonjoy.com/util": "^1.9.0",
     "sonic-forest": "^1.2.1",
     "thingies": "^2.5.0",
-    "tree-dump": "^1.0.3"
+    "tree-dump": "^1.1.0"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.9.3",
diff --git a/src/type/classes/FnType.ts b/src/type/classes/FnType.ts
index 35e314ea..a8811aaf 100644
--- a/src/type/classes/FnType.ts
+++ b/src/type/classes/FnType.ts
@@ -1,11 +1,7 @@
 import {printTree} from 'tree-dump/lib/printTree';
 import * as schema from '../../schema';
-import type {SchemaOf, Type} from '../types';
 import {AbsType} from './AbsType';
-
-const fnNotImplemented: schema.FunctionValue<any, any> = async () => {
-  throw new Error('NOT_IMPLEMENTED');
-};
+import type {SchemaOf, Type} from '../types';
 
 const toStringTree = (tab: string = '', type: FnType<Type, Type, any> | FnRxType<Type, Type, any>) => {
   return printTree(tab, [
@@ -71,6 +67,14 @@ export class FnType<Req extends Type, Res extends Type, Ctx = unknown> extends A
     return this;
   }
 
+  public exec(input: schema.TypeOf<SchemaOf<Req>>) {
+    const func = this.schema.default as schema.FunctionValue<
+      schema.TypeOf<SchemaOf<Req>>,
+      schema.TypeOf<SchemaOf<Res>>
+    >;
+    return func(input);
+  }
+
   public toString(tab: string = ''): string {
     return super.toString(tab) + toStringTree(tab, this);
   }
diff --git a/src/value/FnValue.ts b/src/value/FnValue.ts
new file mode 100644
index 00000000..75b7163a
--- /dev/null
+++ b/src/value/FnValue.ts
@@ -0,0 +1,15 @@
+import {Value} from './Value';
+import type {Printable} from 'tree-dump/lib/types';
+import type * as classes from '../type';
+
+export class FnValue<T extends classes.FnType<any, any, any>> extends Value<T> implements Printable {
+  public async exec(input: classes.ResolveType<T['req']>, ctx?: unknown): Promise<Value<T['res']>> {
+    const fn = this.data as any;
+    const output = await fn(input, ctx);
+    return new Value(output, this.type!.res);
+  }
+
+  public name(): string {
+    return 'FnValue';
+  }
+}
diff --git a/src/value/ObjValue.ts b/src/value/ObjValue.ts
index 47807733..5ad7245a 100644
--- a/src/value/ObjValue.ts
+++ b/src/value/ObjValue.ts
@@ -1,9 +1,9 @@
-import {printTree} from 'tree-dump/lib/printTree';
+import {ModuleType} from '../type/classes/ModuleType';
+import {Value} from './Value';
+import {FnValue} from './FnValue';
 import type {Printable} from 'tree-dump/lib/types';
 import type * as classes from '../type';
 import type {TypeBuilder} from '../type/TypeBuilder';
-import {ModuleType} from '../type/classes/ModuleType';
-import {Value} from './Value';
 
 export type UnObjType<T> = T extends classes.ObjType<infer U> ? U : never;
 export type UnObjValue<T> = T extends ObjValue<infer U> ? U : never;
@@ -14,6 +14,8 @@ export type ObjValueToTypeMap<F> = ToObject<{
   [K in keyof F]: ObjFieldToTuple<F[K]>;
 }>;
 
+export type Ensure<T, X> = T extends X ? T : X;
+
 export class ObjValue<T extends classes.ObjType<any>> extends Value<T> implements Printable {
   public static new = (system: ModuleType = new ModuleType()) => new ObjValue({}, system.t.obj);
 
@@ -41,6 +43,18 @@ export class ObjValue<T extends classes.ObjType<any>> extends Value<T> implement
     return new Value(data, field.val) as any;
   }
 
+  public fn<K extends keyof ObjValueToTypeMap<UnObjType<T>>>(
+    key: K,
+  ): FnValue<
+    Ensure<
+      ObjValueToTypeMap<UnObjType<T>>[K] extends classes.Type ? ObjValueToTypeMap<UnObjType<T>>[K] : classes.Type,
+      classes.FnType<any, any, any>
+    >
+  > {
+    const val = this.get(key);
+    return new FnValue(val.data, val.type as any);
+  }
+
   public field<F extends classes.KeyType<any, any>>(
     field: F | ((t: TypeBuilder) => F),
     data: classes.ResolveType<UnObjFieldTypeVal<F>>,
@@ -78,7 +92,7 @@ export class ObjValue<T extends classes.ObjType<any>> extends Value<T> implement
     return this as any;
   }
 
-  public toString(tab: string = ''): string {
-    return 'ObjValue' + printTree(tab, [(tab) => this.type!.toString(tab)]);
+  public name(): string {
+    return 'ObjValue';
   }
 }
diff --git a/src/value/Value.ts b/src/value/Value.ts
index 378740cc..1cbc2e30 100644
--- a/src/value/Value.ts
+++ b/src/value/Value.ts
@@ -1,16 +1,40 @@
 import {printTree} from 'tree-dump/lib/printTree';
+import {printJson} from 'tree-dump/lib/printJson';
 import type {Printable} from 'tree-dump';
 import type {ResolveType, Type} from '../type/types';
 
+const copyForPrint = (data: unknown): unknown => {
+  if (typeof data === 'function') return '__fN---';
+  if (Array.isArray(data)) return data.map(copyForPrint);
+  if (data && typeof data === 'object') {
+    const res: Record<string, unknown> = {};
+    for (const k in data) res[k] = copyForPrint((data as any)[k]);
+    return res;
+  }
+  return data;
+};
+
 export class Value<T extends Type = Type> implements Printable {
   constructor(
     public data: ResolveType<T>,
     public type?: T,
   ) {}
 
+  public name(): string {
+    return 'Value';
+  }
+
   public toString(tab: string = ''): string {
     const type = this.type;
-    return 'Value' + (type ? printTree(tab, [(tab) => type.toString(tab)]) : '');
+    return (
+      this.name() +
+      (type
+        ? printTree(tab, [
+            (tab) => type.toString(tab),
+            (tab) => printJson(tab, copyForPrint(this.data)).replace(/"__fN---"/g, 'fn()'),
+          ])
+        : '')
+    );
   }
 }
 
diff --git a/src/value/__tests__/ObjValue-router.spec.ts b/src/value/__tests__/ObjValue-router.spec.ts
new file mode 100644
index 00000000..180d87dd
--- /dev/null
+++ b/src/value/__tests__/ObjValue-router.spec.ts
@@ -0,0 +1,8 @@
+import {createRouter} from './ObjValue.fixtures';
+
+test('can retrieve field as Value', async () => {
+  const log = jest.fn();
+  const router = createRouter({log});
+  const result = await router.fn('log.message').exec({message: 'asdf'});
+  expect(result.data).toEqual({time: expect.any(Number)});
+});
diff --git a/src/value/__tests__/ObjValue.fixtures.ts b/src/value/__tests__/ObjValue.fixtures.ts
new file mode 100644
index 00000000..970ba90e
--- /dev/null
+++ b/src/value/__tests__/ObjValue.fixtures.ts
@@ -0,0 +1,41 @@
+import type {ObjType} from '../../type';
+import type {TypeBuilder} from '../../type/TypeBuilder';
+import {ObjValue} from '../ObjValue';
+
+interface Services {
+  log: (msg: string) => void;
+}
+
+export interface RouteDeps {
+  svc: Services;
+  t: TypeBuilder;
+}
+export type RouterBase = ObjType<any>;
+export type Router<R extends RouterBase> = ObjValue<R>;
+
+const addLogMessageRoute =
+  ({t, svc}: RouteDeps) =>
+  <R extends RouterBase>(r: Router<R>) => {
+    return r.set(
+      'log.message',
+      t.fn
+        .inp(t.Object(t.Key('message', t.str)))
+        .out(
+          t.object({
+            time: t.num,
+          }),
+        )
+        .value(({message}) => {
+          svc.log(message);
+          return {time: Date.now()};
+        }),
+    );
+  };
+
+export const createRouter = (svc: Services) => {
+  const base = ObjValue.new();
+  const t = base.system.t;
+  const deps: RouteDeps = {svc, t};
+  const router = addLogMessageRoute(deps)(base);
+  return router;
+};
diff --git a/src/value/__tests__/__snapshots__/ObjValue.spec.ts.snap b/src/value/__tests__/__snapshots__/ObjValue.spec.ts.snap
index 447b4e24..f59eb69d 100644
--- a/src/value/__tests__/__snapshots__/ObjValue.spec.ts.snap
+++ b/src/value/__tests__/__snapshots__/ObjValue.spec.ts.snap
@@ -2,7 +2,10 @@
 
 exports[`can print to string 1`] = `
 "ObjValue
-└─ obj
-   └─ "foo"
-       └─ str"
+├─ obj
+│  └─ "foo"
+│      └─ str
+└─ {
+     "foo": "bar"
+   }"
 `;
diff --git a/yarn.lock b/yarn.lock
index 4c64669f..5327e8e2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -889,7 +889,7 @@ __metadata:
     rxjs: "npm:^7.8.2"
     sonic-forest: "npm:^1.2.1"
     thingies: "npm:^2.5.0"
-    tree-dump: "npm:^1.0.3"
+    tree-dump: "npm:^1.1.0"
     ts-jest: "npm:^29.1.2"
     tslib: "npm:^2.7.0"
     typescript: "npm:^5.6.2"
@@ -3530,7 +3530,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"tree-dump@npm:^1.0.0, tree-dump@npm:^1.0.3":
+"tree-dump@npm:^1.0.0":
   version: 1.0.3
   resolution: "tree-dump@npm:1.0.3"
   peerDependencies:
@@ -3539,6 +3539,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tree-dump@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "tree-dump@npm:1.1.0"
+  peerDependencies:
+    tslib: 2
+  checksum: 10c0/079f0f0163b68ee2eedc65cab1de6fb121487eba9ae135c106a8bc5e4ab7906ae0b57d86016e4a7da8c0ee906da1eae8c6a1490cd6e2a5e5ccbca321e1f959ca
+  languageName: node
+  linkType: hard
+
 "ts-jest@npm:^29.1.2":
   version: 29.4.1
   resolution: "ts-jest@npm:29.4.1"