name: Schema Design
description: Schema Design is the practice of defining the structure, constraints, and semantics of data models used in APIs, databases, and data exchange formats. It encompasses schema-first API design approaches, data modeling methodologies, type systems, and tooling for creating, validating, and evolving data schemas. Key formats include JSON Schema, OpenAPI components/schemas, GraphQL types, Protocol Buffers, Apache Avro, and database DDL. Good schema design improves API consistency, enables automated validation, supports code generation, and facilitates interoperability between systems.
url: https://github.com/api-evangelist/schema-design
x-type: topic
tags:
- Schema Design
- Data Modeling
- API Design
- JSON Schema
- OpenAPI
- GraphQL
- Data Validation
- Type Systems
created: '2026-05-02'
modified: '2026-05-02'
apis:
- name: JSON Schema Specification
  description: JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It is the foundation for defining request and response body schemas in OpenAPI specifications and is used across many API tooling platforms for validation, documentation, and code generation.
  humanURL: https://json-schema.org
  baseURL: https://json-schema.org
  tags:
  - JSON Schema
  - Validation
  - Specification
  properties:
  - type: Documentation
    url: https://json-schema.org/learn/
  - type: Reference
    url: https://json-schema.org/specification

- name: OpenAPI Schema Objects
  description: OpenAPI uses a subset of JSON Schema (with extensions) to define the schema of request bodies, parameters, and response payloads. Understanding OpenAPI schema design is essential for building well-documented, machine-readable REST APIs.
  humanURL: https://spec.openapis.org/oas/v3.1.0#schema-object
  baseURL: https://spec.openapis.org
  tags:
  - OpenAPI
  - REST
  - API Design
  - Schema
  properties:
  - type: Documentation
    url: https://spec.openapis.org/oas/v3.1.0#schema-object
  - type: Reference
    url: https://swagger.io/specification/

- name: GraphQL Type System
  description: GraphQL uses a strong type system to define the shape of data that can be queried. GraphQL schemas define types, queries, mutations, and subscriptions that form the contract between clients and servers.
  humanURL: https://graphql.org/learn/schema/
  baseURL: https://graphql.org
  tags:
  - GraphQL
  - Type System
  - API Design
  - Schema
  properties:
  - type: Documentation
    url: https://graphql.org/learn/schema/
  - type: Reference
    url: https://spec.graphql.org/

- name: Apache Avro Schema
  description: Apache Avro is a data serialization system that uses JSON for schema definition. Avro schemas are widely used in event streaming with Apache Kafka and provide rich schema evolution support including backward and forward compatibility.
  humanURL: https://avro.apache.org/docs/current/spec.html
  baseURL: https://avro.apache.org
  tags:
  - Avro
  - Event Streaming
  - Kafka
  - Serialization
  properties:
  - type: Documentation
    url: https://avro.apache.org/docs/current/spec.html

- name: Protocol Buffers (Protobuf) Schema
  description: Protocol Buffers is Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data. Proto schemas (.proto files) define messages and services, and are used heavily in gRPC APIs.
  humanURL: https://protobuf.dev/programming-guides/proto3/
  baseURL: https://protobuf.dev
  tags:
  - Protobuf
  - gRPC
  - Serialization
  - API Design
  properties:
  - type: Documentation
    url: https://protobuf.dev/programming-guides/proto3/

common:
- type: Website
  url: https://json-schema.org
- type: JSONSchema
  url: json-schema/schema-design-api-schema-schema.json
- type: JSONStructure
  url: json-structure/schema-design-api-schema-structure.json
- type: JSONLDContext
  url: json-ld/schema-design-context.jsonld
- type: Vocabulary
  url: vocabulary/schema-design-vocabulary.yml
maintainers:
- FN: API Evangelist
  email: info@apievangelist.com