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API Contract Specification

Contract-first API specification governing REST and event schemas, idempotency keys, rate limits, and RFC 7807 error responses.

TEMPLATE // INSPECT: TPL-ARC-004MODIFIED: 2026-09-18
CATEGORYArchitecture & Technical Design
VERSIONv1.0.0
RISK LEVELMEDIUM
ARTIFACT CLASSDOC
FORMATSdocx, pdf, md, yaml, mermaid, svg
AI & EXECUTIVE SUMMARY

Strict contract-first API baseline featuring idempotency caching, RFC 7807 Problem Details, and OpenAPI 3.1 YAML samples.

Important Tech Document Template & Operational Notice

TinyCTO.tv Tech Document Template Notice: This template is a general educational and operational starting point. It is not legal, tax, accounting, investment, procurement, regulatory, security or certification advice. Requirements vary by jurisdiction, organization, contract and risk. Review and adapt it with qualified professionals before relying on it.

Problem Solved

Frontend and backend teams build in isolation, leading to integration mismatches, silent breaking changes, and fragile APIs.

When to Use

  • •Before starting frontend or mobile integration
  • •When exposing public partner APIs
  • •For microservice communication contracts

When NOT to Use

  • •For internal quick prototyping scripts

1 Template Sections & Structural Outline

1. Core Context & Governancestandard, enterprise

Defines formal boundaries, ownership, and scope.

Guidance:Fill in all stakeholder matrices before code review.

Completion Instructions

1. Review the blank template. 2. Adapt the worked scenario to your organization. 3. Validate against the review checklist.

Independent Review Checklist

  • All mandatory sections completed
  • No confidential secrets or credentials included
  • Sponsor or Lead sign-off obtained
WORKED SCENARIO SHOWCASE

API Contract Specification - Worked Case Study

Fictional Entity: Nexus / Hyperion Systems

Production scenario demonstrating end-to-end artifact completion.

Key Highlights & Outputs:
  • •Concrete data points
  • •Real-world decision trade-offs
  • •Tested formulas and structures

Frequently Asked Questions

Why is RFC 7807 mandated for error responses?

It provides a standardized, machine-readable format for reporting errors, preventing disparate JSON schemas across teams.

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TPL-ARC-004-API-Contract-Specification-Blank-EN.docxdocx
all11.6 KB
TPL-ARC-004-API-Contract-Specification-Blank-EN.pdfpdf
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TPL-ARC-004-API-Contract-Specification-Example-EN.docxdocx
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TPL-ARC-004-API-Contract-Specification-Example-EN.pdfpdf
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TPL-ARC-004-API-Contract-OpenAPI-Spec-Example-EN.yamlyaml
all0.6 KB
TPL-ARC-004-API-Sozlesme-Sartnamesi-Bos-TR.docxdocx
all11.0 KB
TPL-ARC-004-API-Sozlesme-Sartnamesi-Bos-TR.pdfpdf
all132.3 KB
TPL-ARC-004-API-Sozlesme-Sartnamesi-Ornek-TR.docxdocx
all11.1 KB
TPL-ARC-004-API-Sozlesme-Sartnamesi-Ornek-TR.pdfpdf
all136.6 KB
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Authoritative Sources

Related Tech Document Templates

TPL-ARC-001Software Architecture Document (SAD)TPL-PPM-001Gantt & PERT/CPM Planning Pack