# REST API Monitoring

Developers are relying more on APIs to bring data and services to their applications, drive traffic and accelerate internal projects. Applications Manager enables you to proactively monitor your REST APIs, effortlessly, for availability, performance and functional correctness.

## Get an At-A-Glance View of API Health

Perform comprehensive REST API performance monitoring for your business-critical applications. Know when an API is down - Monitor the availability and response time of your REST API endpoints. Also, get insight into the response time of mobile and web applications that use your API.

![REST API Monitoring Response Time](https://www.manageengine.com/products/applications_manager/images/rest-api-response-time.jpg)

## Monitor and Validate Data from REST API Endpoints

Ensure the structure and content of your REST API responses meet your expectations. Verify that the APIs are returning the correct data in the Response Details tab.

![REST API Data Validation](https://www.manageengine.com/products/applications_manager/images/rest-api-data-validation.png)

## Real-Time Alerts and Notifications

Get immediate notification when key API transactions fail and performance bottlenecks. Stay on top of issues with instantaneous alerts via Email, SMS, voice calls and push messages.

![REST API Monitoring Reports](https://www.manageengine.com/products/applications_manager/images/rest-api-monitoring-reports.jpg)

For example, here is an alarm triggered for a REST API monitor when the endpoint returned no response or an error response code:

**Image 1: Alarm for "No Response" Scenario**

![REST API Error 400](https://www.manageengine.com/products/applications_manager/images/RESTAPI-Error400.png)

**Image 2: Alarm for "Error Response Code" Scenario**

![REST API Error 401](https://www.manageengine.com/products/applications_manager/images/RESTAPI-Error401.png)

## Quickly diagnose API transaction failures

With simple reporting and detailed stats, receive insights on the key metrics that affect the API performance. Analyze every aspect of your REST API performance, detect downtime and fix critical issues before customers are affected.

Applications Manager uses token based authentication for authorization of REST API endpoints. Token based authentication involves the use of a token (an alphanumeric key) to identify a particular user. Applications Manager offers two different types of token based authentication options - Open Authorization (OAuth 2.0) protocol and Web Token based Authorization. Click [here](https://pitstop.manageengine.com/portal/en/kb/articles/authentication-methods-in-applications-manager) to learn more.

With Applications Manager, you can get insight into the response time of mobile and web applications that use your API and be notified when key API transactions fail. Applications Manager also supports [REST API Sequence monitoring!](https://www.manageengine.com/products/applications_manager/rest-api-sequence-monitor.html)