diff --git a/src/lib/openapi/spec/__snapshots__/constraint-schema.test.ts.snap b/src/lib/openapi/spec/__snapshots__/constraint-schema.test.ts.snap
new file mode 100644
index 0000000000..f6e5ab0b48
--- /dev/null
+++ b/src/lib/openapi/spec/__snapshots__/constraint-schema.test.ts.snap
@@ -0,0 +1,61 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`constraintSchema invalid operator name 1`] = `
+Object {
+  "data": Object {
+    "contextName": "a",
+    "operator": "b",
+    "value": "1",
+  },
+  "errors": Array [
+    Object {
+      "instancePath": "/operator",
+      "keyword": "enum",
+      "message": "must be equal to one of the allowed values",
+      "params": Object {
+        "allowedValues": Array [
+          "NOT_IN",
+          "IN",
+          "STR_ENDS_WITH",
+          "STR_STARTS_WITH",
+          "STR_CONTAINS",
+          "NUM_EQ",
+          "NUM_GT",
+          "NUM_GTE",
+          "NUM_LT",
+          "NUM_LTE",
+          "DATE_AFTER",
+          "DATE_BEFORE",
+          "SEMVER_EQ",
+          "SEMVER_GT",
+          "SEMVER_LT",
+        ],
+      },
+      "schemaPath": "#/properties/operator/enum",
+    },
+  ],
+  "schema": "#/components/schemas/constraintSchema",
+}
+`;
+
+exports[`constraintSchema invalid value type 1`] = `
+Object {
+  "data": Object {
+    "contextName": "a",
+    "operator": "NUM_LTE",
+    "value": 1,
+  },
+  "errors": Array [
+    Object {
+      "instancePath": "/value",
+      "keyword": "type",
+      "message": "must be string",
+      "params": Object {
+        "type": "string",
+      },
+      "schemaPath": "#/properties/value/type",
+    },
+  ],
+  "schema": "#/components/schemas/constraintSchema",
+}
+`;
diff --git a/src/lib/openapi/spec/constraint-schema.test.ts b/src/lib/openapi/spec/constraint-schema.test.ts
new file mode 100644
index 0000000000..f38ad099c6
--- /dev/null
+++ b/src/lib/openapi/spec/constraint-schema.test.ts
@@ -0,0 +1,34 @@
+import { validateSchema } from '../validate';
+import { ConstraintSchema } from './constraint-schema';
+
+test('constraintSchema', () => {
+    const data: ConstraintSchema = {
+        contextName: 'a',
+        operator: 'NUM_LTE',
+        value: '1',
+    };
+
+    expect(
+        validateSchema('#/components/schemas/constraintSchema', data),
+    ).toBeUndefined();
+});
+
+test('constraintSchema invalid value type', () => {
+    expect(
+        validateSchema('#/components/schemas/constraintSchema', {
+            contextName: 'a',
+            operator: 'NUM_LTE',
+            value: 1,
+        }),
+    ).toMatchSnapshot();
+});
+
+test('constraintSchema invalid operator name', () => {
+    expect(
+        validateSchema('#/components/schemas/constraintSchema', {
+            contextName: 'a',
+            operator: 'b',
+            value: '1',
+        }),
+    ).toMatchSnapshot();
+});
diff --git a/src/lib/openapi/validate.test.ts b/src/lib/openapi/validate.test.ts
new file mode 100644
index 0000000000..196394ff3d
--- /dev/null
+++ b/src/lib/openapi/validate.test.ts
@@ -0,0 +1,7 @@
+import { validateSchema } from './validate';
+
+test('validateSchema', () => {
+    expect(() => validateSchema('unknownSchemaId' as any, {})).toThrow(
+        'no schema with key or ref "unknownSchemaId"',
+    );
+});
diff --git a/src/lib/routes/admin-api/constraints.ts b/src/lib/routes/admin-api/constraints.ts
index 2c2b056d29..9c6d18ec8a 100644
--- a/src/lib/routes/admin-api/constraints.ts
+++ b/src/lib/routes/admin-api/constraints.ts
@@ -6,27 +6,49 @@ import { IConstraint } from '../../types/model';
 import { NONE } from '../../types/permissions';
 import Controller from '../controller';
 import { Logger } from '../../logger';
+import { OpenApiService } from '../../services/openapi-service';
+import { createRequestSchema } from '../../openapi';
 
 export default class ConstraintController extends Controller {
     private featureService: FeatureToggleService;
 
+    private openApiService: OpenApiService;
+
     private readonly logger: Logger;
 
     constructor(
         config: IUnleashConfig,
         {
             featureToggleServiceV2,
-        }: Pick<IUnleashServices, 'featureToggleServiceV2'>,
+            openApiService,
+        }: Pick<IUnleashServices, 'featureToggleServiceV2' | 'openApiService'>,
     ) {
         super(config);
         this.featureService = featureToggleServiceV2;
+        this.openApiService = openApiService;
         this.logger = config.getLogger('/admin-api/validation.ts');
 
-        this.post('/validate', this.validateConstraint, NONE);
+        this.route({
+            method: 'post',
+            path: '/validate',
+            handler: this.validateConstraint,
+            permission: NONE,
+            middleware: [
+                openApiService.validPath({
+                    tags: ['admin'],
+                    operationId: 'validateConstraint',
+                    requestBody: createRequestSchema('constraintSchema'),
+                    responses: {
+                        204: { description: 'validConstraint' },
+                        400: { description: 'invalidConstraint' },
+                    },
+                }),
+            ],
+        });
     }
 
     async validateConstraint(
-        req: Request<{}, undefined, IConstraint>,
+        req: Request<void, void, IConstraint>,
         res: Response,
     ): Promise<void> {
         await this.featureService.validateConstraint(req.body);
diff --git a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
index aeb39d2d7c..59d5f6051a 100644
--- a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
+++ b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
@@ -987,6 +987,33 @@ Object {
         ],
       },
     },
+    "/api/admin/constraints/validate": Object {
+      "post": Object {
+        "operationId": "validateConstraint",
+        "requestBody": Object {
+          "content": Object {
+            "application/json": Object {
+              "schema": Object {
+                "$ref": "#/components/schemas/constraintSchema",
+              },
+            },
+          },
+          "description": "constraintSchema",
+          "required": true,
+        },
+        "responses": Object {
+          "204": Object {
+            "description": "validConstraint",
+          },
+          "400": Object {
+            "description": "invalidConstraint",
+          },
+        },
+        "tags": Array [
+          "admin",
+        ],
+      },
+    },
     "/api/admin/features": Object {
       "get": Object {
         "deprecated": true,