How to Call a REST API from a ServiceNow Workflow

To call a REST API from ServiceNow workflow, a few steps need to be followed. Understand the process and its importance first. Calling the API allows one to integrate external systems, access and change data, and automate processes within the ServiceNow instance.

Identify the URL of the API you want to use. It is the address where your request will be sent. Check if you have the necessary credentials and authorizations for accessing the API.

Next, configure the HTTP method, for example GET, POST, PUT, or DELETE. Choose the method based on the operation you want to do.

Define any additional headers or parameters that need to be included in the request. These provide information or authentication details.

Time to test it out! Execute your workflow and see if the API is called and the action is performed.

Let me share an instance that shows the effectiveness of calling APIs from ServiceNow workflows. A company had to manually create tickets when an incident occurred. It took a lot of time and effort.

Integrating their system with an external monitoring tool’s REST API through ServiceNow workflows solved the problem. Tickets were automatically created whenever an incident was detected. This saved time and reduced human error.

Using ServiceNow workflows to call REST APIs is beneficial. It automates tasks that were manual before. Plus, it provides seamless integration with external systems for better functionality.

Understanding REST API and ServiceNow Workflow

REST API is a great tool for communication between different software systems. ServiceNow Workflow is a powerful platform for automating business processes. Knowing how to call REST API from ServiceNow Workflow can boost the efficiency and effectiveness of workflows.

When calling REST API from ServiceNow Workflow, there are a few points to consider. First, it’s important to understand REST itself. REST stands for Representational State Transfer. It has rules for creating web services that are scalable, stateless, and resource-centric.

When using ServiceNow Workflow to call a REST API, HTTP requests are sent to an external system or service. This could be done with GET, POST, PUT, or DELETE. For instance, if you need to get data from an outside database or modify records in another app, you’d use the relevant HTTP method with the right parameters and headers.

ServiceNow has features and tools to make calling REST API from workflows simpler. Business Rules and Script Includes enable developers to write custom code for interacting with external systems. Moreover, ServiceNow offers integration plugins for popular services such as Salesforce and JIRA, making integration easier.

It’s important to understand the importance of calling REST API from ServiceNow Workflow in modern business operations. As cloud-based solutions become more common, and the need for smooth integrations between applications grows, ServiceNow stands out as a leader. With its strong workflow capabilities and features for invoking REST APIs, ServiceNow is a go-to platform.

Steps to Call REST API from ServiceNow Workflow

Want to call a REST API using ServiceNow Workflow? Here’s how:

  1. Define the REST message. Create a new record in ServiceNow. Add details like HTTP method, endpoint URL, and authentication credentials.
  2. Compose the payload. Use data from workflow variables. Ensure the format matches the API documentation.
  3. Make the API call. Use the ‘RESTMessageV2’ script include to invoke the REST message. Pass the payload.
  4. Process the response. Handle and parse it. May require further processing or manipulation.
  5. Error handling. Implement mechanisms for API calls that fail or return unexpected results. Log errors, send notifications, or take alternative actions.

Plus, explore advanced features such as dynamic data transformation with scripts, or pagination for large result sets.

The idea of calling REST APIs from ServiceNow Workflow arose as organizations needed ways to automate processes and system integration. This functionality enables developers to create extensive capabilities.

Best Practices for Calling REST API from ServiceNow Workflow

Calling REST API from ServiceNow Workflow can be done with ease by following these best practices. Utilize ServiceNow’s built-in RESTMessageV2 script object to simplify the process. Input validation and sanitization are important for security. Error handler mechanisms can handle any unexpected fails. Leverage asynchronous processing to boost performance and avoid blocking other activities.

When integrating external systems to your ServiceNow workflows, it is vital to choose the right authentication method. OAuth 2.0 provides secure access to protected resources without exposing credentials. This ensures data integrity and confidentiality.

Optimizing payload size and minimizing unnecessary data transfer can enhance the efficiency of calling REST API. This can be done by intelligent data filtering and compression techniques. Implementing caching mechanisms also help. This reduces response times and overall system load.

Examples and Use Cases

Rest APIs from ServiceNow workflows are powerful! They let users automate processes and exchange data with external sources. For instance, they can integrate with a third-party HR system. This way, onboarding and offboarding is faster and data accuracy is guaranteed in real-time.

Furthermore, incident management can be orchestrated using Rest APIs. When an incident is reported, a workflow can trigger a Rest API call to open a ticket in Jira or another external ticketing system. This boosts collaboration between IT teams, helping resolve incidents faster.

Rest APIs also upgrade the service catalog. Workflows can make Rest API requests to external systems. This way, users have access to self-service tools like cloud resource provisioning and software license requests.

Leverage Rest APIs from ServiceNow workflows! Automate processes, provide seamless integration, and offer excellent services. Don’t miss out on this opportunity to revolutionize workflow management and reach operational excellence!


When using a REST API in ServiceNow workflows, consider these tips.

  1. Make sure you have the right credentials and permissions to access and use the API. This makes sure ServiceNow and the external system are integrated correctly.

  2. Handle any errors or exceptions that happen during the API call. This will stop any disruptions and help resolve issues quickly.

  3. Also, data mapping is essential. Check that the data between ServiceNow and the API is the same, so there are no inconsistencies or data loss. Understand the data structures of both systems and align them.

  4. Add rate limiting mechanisms to limit the amount of requests and prevent overloading the target system.

  5. Caching frequently used data locally can reduce latency and minimize unnecessary API calls.

  6. Plus, use encryption protocols like HTTPS to keep sensitive data secure from unauthorised access.

By following these guidelines, your API calls from ServiceNow will be secure, efficient, and accurate.

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