diff --git a/Validator.test.ts b/Validator.test.ts
index 2ca3f69..c962f85 100644
--- a/Validator.test.ts
+++ b/Validator.test.ts
@@ -7,6 +7,8 @@ import {
   Validatable,
   ArraySymbol,
   isString,
+  isNumber,
+  isInteger,
 } from "./mod.ts";
 
 Deno.test("validate schema (match)", async () => {
@@ -14,7 +16,7 @@ Deno.test("validate schema (match)", async () => {
     ["string", isString],
     ["string", [isString]],
     [["arr", "ay"], { [ArraySymbol]: isString }],
-    [{ foo: "bar", lorem: "ipsum" }, { foo: isString, lorem: [isString] }],
+    [{ foo: 3.1415, lorem: "ipsum" }, { foo: isNumber, lorem: [isString] }],
   ];
   for (const [value, constraints] of values) {
     assertEquals([], await validate(value, constraints));
@@ -26,7 +28,7 @@ Deno.test("validate schema (no match)", async () => {
     [6, isString],
     [false, [isString]],
     [["arr", ["ay"]], { [ArraySymbol]: isString }],
-    [{ foo: {}, lorem: "ipsum" }, { foo: isString, lorem: [isString] }],
+    [{ foo: 3.1415, lorem: "ipsum" }, { foo: isInteger, lorem: [isString] }],
   ];
   for (const [value, constraints] of values) {
     assertNotEquals([], await validate(value, constraints));
diff --git a/mod.ts b/mod.ts
index a11d6b1..3bcac77 100644
--- a/mod.ts
+++ b/mod.ts
@@ -7,3 +7,4 @@ export {
   ArraySymbol,
 } from "./Validator.ts";
 export * from "./validators/string.ts";
+export * from "./validators/number.ts";
diff --git a/validators/number.test.ts b/validators/number.test.ts
new file mode 100644
index 0000000..e5ba370
--- /dev/null
+++ b/validators/number.test.ts
@@ -0,0 +1,69 @@
+import { isNumber, isInteger } from "./number.ts";
+import { validate } from "../mod.ts";
+import {
+  assertEquals,
+  assertNotEquals,
+} from "https://deno.land/std@0.53.0/testing/asserts.ts";
+
+Deno.test("isNumber (match)", async () => {
+  const values = [
+    0,
+    1,
+    2e64,
+    -1,
+    0.1,
+    Math.PI,
+  ];
+  for (const value of values) {
+    assertEquals(await validate(value, isNumber), []);
+  }
+});
+
+Deno.test("isNumber (no match)", async () => {
+  const values = [
+    undefined,
+    null,
+    NaN,
+    "0",
+    true,
+    false,
+    () => {},
+    function named() {},
+    new Object(),
+    Symbol(),
+  ];
+  for (const value of values) {
+    assertNotEquals(await validate(value, isNumber), []);
+  }
+});
+
+Deno.test("isInteger (match)", async () => {
+  const values = [
+    0,
+    1,
+    2e64,
+    -1,
+  ];
+  for (const value of values) {
+    assertEquals(await validate(value, isInteger), []);
+  }
+});
+
+Deno.test("isInteger (no match)", async () => {
+  const values = [
+    undefined,
+    null,
+    NaN,
+    "0",
+    true,
+    false,
+    () => {},
+    function named() {},
+    new Object(),
+    Symbol(),
+    0.1,
+  ];
+  for (const value of values) {
+    assertNotEquals(await validate(value, isInteger), []);
+  }
+});
diff --git a/validators/number.ts b/validators/number.ts
new file mode 100644
index 0000000..9fd57e8
--- /dev/null
+++ b/validators/number.ts
@@ -0,0 +1,25 @@
+import { Validator, Args } from "../mod.ts";
+
+export const isNumber: Validator = {
+  type: "isNumber",
+  check: (value: any) => {
+    if (!Number.isFinite(value)) {
+      return {};
+    }
+  },
+  message: (value: any, args?: Args) => {
+    return `The value '${value && value.toString()}' has to be a number.`;
+  },
+};
+
+export const isInteger: Validator = {
+  type: "isInteger",
+  check: (value: any) => {
+    if (!Number.isInteger(value)) {
+      return {};
+    }
+  },
+  message: (value: any, args?: Args) => {
+    return `The value '${value && value.toString()}' has to be an integer.`;
+  },
+};
diff --git a/validators/string.test.ts b/validators/string.test.ts
index 79c8d3d..0776460 100644
--- a/validators/string.test.ts
+++ b/validators/string.test.ts
@@ -13,7 +13,7 @@ Deno.test("isString (match)", async () => {
     new String("bar"),
   ];
   for (const value of values) {
-    assertEquals([], await validate(value, isString));
+    assertEquals(await validate(value, isString), []);
   }
 });
 
@@ -31,6 +31,6 @@ Deno.test("isString (no match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertNotEquals([], await validate(value, isString));
+    assertNotEquals(await validate(value, isString), []);
   }
 });