diff --git a/plugin/gatsby-node.js b/plugin/gatsby-node.js
index 404f160..6072d73 100644
--- a/plugin/gatsby-node.js
+++ b/plugin/gatsby-node.js
@@ -3,6 +3,24 @@ const { newCloudinary, getResourceOptions } = require('./utils');
 const REPORTER_PREFIX = `gatsby-source-cloudinary`;
 const NODE_TYPE = `CloudinaryMedia`;
 
+exports.pluginOptionsSchema = ({ Joi }) => {
+  return Joi.object({
+    cloudName: Joi.string().required(),
+    apiKey: Joi.string().required(),
+    apiSecret: Joi.string().required(),
+    resourceType: Joi.string().default('image'),
+    type: Joi.string().default('all'),
+    maxResults: Joi.number().integer().positive().default(10),
+    resultsPerPage: Joi.number()
+      .integer()
+      .positive()
+      .default(Joi.ref('maxResults')),
+    tags: Joi.boolean().default(false),
+    prefix: Joi.string(),
+    context: Joi.boolean(),
+  });
+};
+
 const getNodeData = (gatsbyUtils, media, cloudName) => {
   const { createNodeId, createContentDigest } = gatsbyUtils;
 
diff --git a/plugin/gatsby-node.test.js b/plugin/gatsby-node.test.js
new file mode 100644
index 0000000..7ee1ad7
--- /dev/null
+++ b/plugin/gatsby-node.test.js
@@ -0,0 +1,72 @@
+import Joi from 'joi';
+import { testPluginOptionsSchema } from 'gatsby-plugin-utils';
+import { pluginOptionsSchema } from './gatsby-node';
+
+describe('pluginOptionsSchema', () => {
+  test('should validate minimal correct options', async () => {
+    const options = {
+      cloudName: 'cloudName',
+      apiKey: 'apiKey',
+      apiSecret: 'apiSecret',
+    };
+
+    const { isValid } = await testPluginOptionsSchema(
+      pluginOptionsSchema,
+      options,
+    );
+
+    expect(isValid).toBe(true);
+  });
+
+  test('should invalidate incorrect options', async () => {
+    const options = {
+      cloudName: 120,
+      apiKey: '',
+      resourceType: '',
+      type: 30,
+      maxResults: '',
+      resultsPerPage: 'hello',
+      tags: 'world',
+      prefix: 800,
+      context: '',
+    };
+
+    const { isValid, errors } = await testPluginOptionsSchema(
+      pluginOptionsSchema,
+      options,
+    );
+
+    expect(isValid).toBe(false);
+    expect(errors).toEqual([
+      `"cloudName" must be a string`,
+      `"apiKey" is not allowed to be empty`,
+      `"apiSecret" is required`,
+      `"resourceType" is not allowed to be empty`,
+      `"type" must be a string`,
+      `"maxResults" must be a number`,
+      `"resultsPerPage" must be a number`,
+      `"tags" must be a boolean`,
+      `"prefix" must be a string`,
+      `"context" must be a boolean`,
+    ]);
+  });
+
+  test('should add defaults', async () => {
+    const schema = pluginOptionsSchema({ Joi });
+    const options = {
+      cloudName: 'cloudName',
+      apiKey: 'apiKey',
+      apiSecret: 'apiSecret',
+    };
+    const { value } = schema.validate(options);
+
+    expect(value).toEqual({
+      ...options,
+      resourceType: 'image',
+      maxResults: 10,
+      resultsPerPage: 10,
+      tags: false,
+      type: 'all',
+    });
+  });
+});