diff --git a/packages/nodes-base/credentials/MauticOAuth2Api.credentials.ts b/packages/nodes-base/credentials/MauticOAuth2Api.credentials.ts
index 104ac8203..ea5e131de 100644
--- a/packages/nodes-base/credentials/MauticOAuth2Api.credentials.ts
+++ b/packages/nodes-base/credentials/MauticOAuth2Api.credentials.ts
@@ -22,14 +22,14 @@ export class MauticOAuth2Api implements ICredentialType {
 			displayName: 'Authorization URL',
 			name: 'authUrl',
 			type: 'hidden',
-			default: '={{$self["url"]}}/oauth/v2/authorize',
+			default: '={{$self["url"].endsWith("/") ? $self["url"].slice(0, -1) : $self["url"]}}/oauth/v2/authorize',
 			required: true,
 		},
 		{
 			displayName: 'Access Token URL',
 			name: 'accessTokenUrl',
 			type: 'hidden',
-			default: '={{$self["url"]}}/oauth/v2/token',
+			default: '={{$self["url"].endsWith("/") ? $self["url"].slice(0, -1) : $self["url"]}}/oauth/v2/token',
 			required: true,
 		},
 		{
diff --git a/packages/nodes-base/nodes/Mautic/GenericFunctions.ts b/packages/nodes-base/nodes/Mautic/GenericFunctions.ts
index c0ff315d9..6b68c00ff 100644
--- a/packages/nodes-base/nodes/Mautic/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/Mautic/GenericFunctions.ts
@@ -10,7 +10,11 @@ import {
 } from 'n8n-core';
 
 import {
-	IDataObject, JsonObject, NodeApiError,
+	ICredentialDataDecryptedObject,
+	ICredentialTestFunctions,
+	IDataObject,
+	JsonObject,
+	NodeApiError,
 } from 'n8n-workflow';
 
 export async function mauticApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, endpoint: string, body: any = {}, query?: IDataObject, uri?: string): Promise<any> { // tslint:disable-line:no-any
@@ -31,19 +35,21 @@ export async function mauticApiRequest(this: IHookFunctions | IExecuteFunctions
 
 		if (authenticationMethod === 'credentials') {
 			const credentials = await this.getCredentials('mauticApi') as IDataObject;
+			const baseUrl = credentials!.url as string;
 
 			const base64Key = Buffer.from(`${credentials.username}:${credentials.password}`).toString('base64');
 
 			options.headers!.Authorization = `Basic ${base64Key}`;
 
-			options.uri = `${credentials.url}${options.uri}`;
+			options.uri = `${baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl}${options.uri}`;
 
 			//@ts-ignore
 			returnData = await this.helpers.request(options);
 		} else {
 			const credentials = await this.getCredentials('mauticOAuth2Api') as IDataObject;
+			const baseUrl = credentials!.url as string;
 
-			options.uri = `${credentials.url}${options.uri}`;
+			options.uri = `${baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl}${options.uri}`;
 			//@ts-ignore
 			returnData = await this.helpers.requestOAuth2.call(this, 'mauticOAuth2Api', options, { includeCredentialsOnRefreshOnBody: true });
 		}
@@ -96,3 +102,30 @@ export function validateJSON(json: string | undefined): any { // tslint:disable-
 	}
 	return result;
 }
+
+export async function validateCredentials(this: ICredentialTestFunctions, decryptedCredentials: ICredentialDataDecryptedObject): Promise<any> { // tslint:disable-line:no-any
+	const credentials = decryptedCredentials;
+
+	const {
+		url,
+		username,
+		password,
+	} = credentials as {
+		url: string,
+		username: string,
+		password: string,
+	};
+
+	const base64Key = Buffer.from(`${username}:${password}`).toString('base64');
+
+	const options: OptionsWithUri = {
+		method: 'GET',
+		headers: {
+			Authorization: `Basic ${base64Key}`,
+		},
+		uri: url.endsWith('/') ? `${url}api/users/self` : `${url}/api/users/self`,
+		json: true,
+	};
+
+	return await this.helpers.request(options);
+}
diff --git a/packages/nodes-base/nodes/Mautic/Mautic.node.ts b/packages/nodes-base/nodes/Mautic/Mautic.node.ts
index d84dbdde0..a1ee45190 100644
--- a/packages/nodes-base/nodes/Mautic/Mautic.node.ts
+++ b/packages/nodes-base/nodes/Mautic/Mautic.node.ts
@@ -3,8 +3,12 @@ import {
 } from 'n8n-core';
 
 import {
+	ICredentialDataDecryptedObject,
+	ICredentialsDecrypted,
+	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
+	INodeCredentialTestResult,
 	INodeExecutionData,
 	INodePropertyOptions,
 	INodeType,
@@ -17,6 +21,7 @@ import {
 import {
 	mauticApiRequest,
 	mauticApiRequestAllItems,
+	validateCredentials,
 	validateJSON,
 } from './GenericFunctions';
 
@@ -80,6 +85,7 @@ export class Mautic implements INodeType {
 						],
 					},
 				},
+				testedBy: 'mauticCredentialTest',
 			},
 			{
 				name: 'mauticOAuth2Api',
@@ -166,6 +172,29 @@ export class Mautic implements INodeType {
 	};
 
 	methods = {
+		credentialTest: {
+			async mauticCredentialTest(this: ICredentialTestFunctions, credential: ICredentialsDecrypted): Promise<INodeCredentialTestResult> {
+				try {
+					let responseData;
+					responseData = await validateCredentials.call(this, credential.data as ICredentialDataDecryptedObject);
+					if (responseData.id) {
+						return {
+							status: 'OK',
+							message: 'Authentication successful!',
+						};
+					}
+				} catch (error) {
+					return {
+						status: 'Error',
+						message: 'Invalid credentials',
+					};
+				}
+				return {
+					status: 'Error',
+					message: 'Invalid credentials',
+				};
+			},
+		},
 		loadOptions: {
 			// Get all the available companies to display them to user so that he can
 			// select them easily