API Guidelines
  • adidas API Guidelines
  • General Guidelines
    • Introduction
    • API First
    • Contract
    • Immutability
    • Robustness
    • Common Data Types
    • Version Control System
    • Minimal API Surface
    • Rules for Extending
    • JSON
    • Security
    • Tooling
  • REST API Guidelines
    • Introduction
    • Core REST Principles
      • OpenAPI Specification
      • API Design Platform
      • Design Maturity
      • Testing
    • Protocol
      • HTTP
      • TLS
      • Separate Concerns
      • Request Methods
      • Status Codes
    • Message
      • Message Formats
      • Content Negotiation
      • HAL
      • Problem Detail
      • Foreign Key Relations
    • Application
      • Corporate Data Model
      • Common Data Types
    • Execution
      • Pagination
      • Long Running Tasks
        • Polling
        • Callback
        • Files Upload
      • Batch Operations
      • Search Requests
      • Query Requests with Large Inputs
      • Choosing Fields and Embedded Resources
      • Localization
      • Rate Limiting
      • Caching
      • Testing Enviroments
    • Evolution
      • Naming Conventions
      • Reserved Identifiers
      • URI Structure
      • Changes and Versioning
      • Phasing out Old Versions
    • Guides
      • API Testing CI Environment
      • Complete API Development
    • API Clients
      • Loose Coupling
    • Further References
  • Asynchronous API Guidelines
    • Introduction
    • Core Asynchronous Principles
      • Event Driven Architectures
      • Messages
        • Commands
        • Queries
        • Events
          • Events as Notifications
          • Events to Replicate Data
      • Protocols
      • Coupling
      • Bounded Context
      • Stream Processing
      • Naming Conventions
      • Tooling
        • Editors
        • Command Line Interface (CLI)
        • Generators
    • Kafka Asynchronous Guidelines
      • Introduction
        • Why AsyncAPI?
      • AsyncAPI Version
      • Internal vs Public Specifications
      • Key/Value Format
      • Message Headers
      • Specification Granularity
      • Self-Contained Specifications
        • Meaningful Descriptions
      • Schema Data Evolution
        • Backward Compatibility
        • Forward Compatibility
        • Full Compatibility
      • Automatic Schema Registration
      • Contact Information
      • AsyncAPI ID
      • Servers
      • Channels
      • Schemas
      • Security Schemes
      • External Docs
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  1. General Guidelines

API First

Everyone MUST follow the API First principle.

The API first principle is an extension of design-first principle. Therefore, a development of an API MUST always start with API design without any upfront coding activities.

API design (e.g., description, schema) is the master of truth, not the API implementation.

API implementation MUST always be compliant to a particular API design which represents the contract between API, and it's consumer.

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Last updated 9 months ago