Reusable API
In MuleSoft's API-led connectivity approach (part of the Salesforce ecosystem), a system API or process API designed to be reused across multiple integration projects, reducing duplication and promoting consistent data access.
Definition
In MuleSoft's API-led connectivity approach (part of the Salesforce ecosystem), a system API or process API designed to be reused across multiple integration projects, reducing duplication and promoting consistent data access.
In plain English
“A Reusable API in MuleSoft's API-led connectivity is a system or process API designed to be reused across multiple integration projects. By making APIs reusable, you reduce duplication and ensure consistent data access patterns across your enterprise.”
Worked example
Cascade Bank's API platform team publishes a Reusable API called customer-360-system-api in MuleSoft - a single system API that exposes the master customer record from the core banking system. The mobile app team, the call-center desktop team, and the marketing-analytics pipeline all consume it instead of each writing their own integration to the mainframe. When the core banking system gets a field rename, the platform team updates one API contract; the three downstream teams get a versioned change and migrate on their own timeline. Without the Reusable API, three teams would have written three slightly different integrations and maintained three sets of bugs.
Why Reusable API matters
In MuleSoft's API-led connectivity approach (part of the Salesforce ecosystem), a Reusable API is a system API or process API designed to be reused across multiple integration projects, reducing duplication and promoting consistent data access. The API-led connectivity model deliberately encourages reuse: build a System API once, and many Process APIs can leverage it; build a Process API once, and many Experience APIs can leverage it.
API reuse is the core value proposition of API-led connectivity. Without reuse, each new integration is built from scratch, with duplicated logic, inconsistent data access, and accumulating technical debt. With reuse, integrations compose from existing building blocks, dramatically reducing the cost and time of new integrations. Mature MuleSoft programs invest in reusable API design, treating each new API as a building block for future work.
How organizations use Reusable API
Built reusable APIs for common data access patterns, leveraged across dozens of integration projects.
Maintains a catalog of reusable APIs with documentation, encouraging developers to compose new integrations from existing pieces.
Treats API reuse as the central discipline of their API-led connectivity practice.
Trust & references
Straight from the source - Salesforce's reference material on Reusable API.
- API-Led Connectivity OverviewMuleSoft Documentation
About the Author
Dipojjal Chakrabarti is a B2C Solution Architect with 29 Salesforce certifications and over 13 years in the Salesforce ecosystem. He runs salesforcedictionary.com to help admins, developers, architects, and cert/interview candidates sharpen their fundamentals. More about Dipojjal.
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Q1. What is a Reusable API?
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