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Knowledge Base Guide

UiPath API Integration Support: HTTP Request, REST APIs, OAuth & Integration Service

API-first automation is the preferred strategy for most enterprise integrations in 2026 — more reliable, faster, and more maintainable than UI automation when a stable API exists. UiPath supports REST API integration through the HTTP Request activity, Integration Service connectors, and custom OAuth flows. If you are struggling with API integration, JSON parsing, token management, Epic FHIR APIs, or API vs UI decision-making — our experts provide real-time support.

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HTTP Request Activity

The HTTP Request activity is UiPath's primary mechanism for calling REST APIs.

  • Endpoint configuration — URL, HTTP method (GET, POST, PUT, PATCH, DELETE)
  • Headers — Content-Type, Authorization, Accept, custom headers
  • Request body — JSON, XML, form-encoded, file upload payloads
  • Authentication types — Bearer token, Basic Auth, API Key, OAuth 2.0
  • Response handling — StatusCode, Content (string), Headers
  • Deserialize JSON activity — converting JSON response string to JObject or custom type

OAuth 2.0 Integration

OAuth 2.0 is required for secure access to modern APIs including Epic FHIR.

  • OAuth flow types — Authorization Code, Client Credentials, PKCE, Resource Owner Password
  • Client Credentials flow — backend-to-backend API access without user interaction
  • Token acquisition — POST to token endpoint with client_id, client_secret, scope
  • Bearer token usage — Authorization: Bearer {token} header in API calls
  • Token refresh logic — detecting token expiry, refreshing before calling protected endpoints
  • Secure token storage — storing tokens in Orchestrator assets, not hardcoded in workflows

JSON Handling in UiPath

JSON is the standard data format for REST API responses and requests.

  • Deserialize JSON activity — parsing JSON string to JObject for property access
  • Accessing nested properties — JObject.Item("key").ToString() and navigation patterns
  • JSON arrays — iterating JArray elements, extracting values from lists
  • Serialize JSON — converting objects back to JSON string for request bodies
  • JSON Schema — validating API response structure before processing
  • Error response handling — checking for error properties in API JSON responses

UiPath Integration Service

Integration Service provides pre-built, managed connectors for common enterprise APIs.

  • Integration Service connectors — Salesforce, ServiceNow, Microsoft 365, SAP, Google Workspace
  • Connection management — OAuth connections stored and managed in Automation Cloud
  • Trigger-based automation — starting workflows from Integration Service events
  • API activity generation — generating custom activities from OpenAPI/Swagger specs
  • Rate limiting handling — built-in retry and throttle management in Integration Service
  • Advantage over HTTP Request — managed authentication, typed responses, easier maintenance

API vs UI Automation Strategy

Choosing between API and UI automation is a critical design decision — and a top interview topic.

  • API-first principle — always prefer a stable API over UI automation when available
  • When UI automation is necessary — no API exists, API access is restricted, legacy systems
  • Epic FHIR API vs Epic UI automation — when to call FHIR API vs automate Hyperspace screens
  • Hybrid approach — API for data retrieval, UI automation for actions that have no API
  • API stability vs UI stability — APIs version carefully; UI changes with application updates
  • Error handling difference — API returns structured error codes; UI failures require screen recovery

Related Support Pages

UiPath Job Support HubEpic FHIR Integration SupportAgentic Automation SupportUiPath Proxy Interview SupportUiPath Epic Automation Support

Related Guides

UiPath Production SupportRPA Job Support

Frequently Asked Questions

What UiPath API integration support do you provide?

We provide real-time support for HTTP Request activity, OAuth 2.0 token flows, JSON parsing, Integration Service connectors, API error handling, retry logic for API calls, and API vs UI automation strategy decisions. We cover Epic FHIR API integration, healthcare API authentication, and enterprise REST API patterns.

How do I implement OAuth 2.0 in UiPath?

We help implement the full OAuth flow — acquiring access tokens using Client Credentials or Authorization Code grant, storing tokens securely in Orchestrator assets, using Bearer tokens in HTTP Request headers, detecting token expiry, and implementing token refresh logic. We cover both standard OAuth and Epic-specific SMART on FHIR authentication.

When should I use Epic FHIR API vs Epic UI automation?

Use Epic FHIR API when you need to read or write patient data programmatically — it is more stable, faster, and safer than UI automation. Use Epic UI automation (Hyperspace/Hyperdrive) when the required action has no FHIR API equivalent, or when API access is not provisioned. We help make this decision for your specific Epic workflows and implement the chosen approach.

Can you help with API error handling and retry logic?

Yes. API error handling includes checking HTTP status codes (200 vs 4xx vs 5xx), parsing error response JSON, implementing exponential backoff retry logic for transient failures, handling rate limiting (HTTP 429), and logging structured error details for production diagnostics.

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