RESTful API Design Guide

A comprehensive, battle-tested reference for designing robust REST APIs. Covers design principles, versioning strategies, pagination, filtering, error handling, idempotency, caching, and includes a co

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Key features of RESTful API Design Guide

Code

• **REST Design Principles** -- Resource naming, HTTP method semantics, HATEOAS, content negotiation, and the Richardson Maturity Model with concrete before/after examples.
• **Versioning Strategies** -- URI path, query param, header, and content-type versioning compared with migration playbooks.
• **Pagination & Filtering** -- Offset, cursor, keyset, and time-based pagination with Python implementations. Field filtering, sorting, full-text search patterns.
• **Error Handling** -- RFC 7807 Problem Details, error envelopes, retry-friendly status codes, and a complete error response catalog in JSON.
• **Idempotency & Caching** -- Idempotency keys, conditional requests (ETags, If-Match, If-None-Match), Cache-Control strategies, and stale-while-revalidate patterns.
• **OpenAPI 3.1 Spec** -- A complete, realistic Orders API specification with 12 endpoints, request/response schemas, error definitions, and security schemes.

**REST Design Principles** -- Resource naming, HTTP method semantics, HATEOAS, content negotiation, and the Richardson Maturity Model with concrete before/after examples.

**Versioning Strategies** -- URI path, query param, header, and content-type versioning compared with migration playbooks.

**Pagination & Filtering** -- Offset, cursor, keyset, and time-based pagination with Python implementations. Field filtering, sorting, full-text search patterns.

**Error Handling** -- RFC 7807 Problem Details, error envelopes, retry-friendly status codes, and a complete error response catalog in JSON.

**Idempotency & Caching** -- Idempotency keys, conditional requests (ETags, If-Match, If-None-Match), Cache-Control strategies, and stale-while-revalidate patterns.

**OpenAPI 3.1 Spec** -- A complete, realistic Orders API specification with 12 endpoints, request/response schemas, error definitions, and security schemes.

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Design Principles Resource Richardson Maturity Model

Quick Start:

# Pagination helpers -- see offset + cursor pagination in action
python3 src/pagination.py

# RFC 7807 error envelopes -- generate Problem Details JSON
python3 src/error_envelope.py

# ETag utilities -- generate and validate entity tags
python3 src/etag.py

Key Features:

**REST Design Principles** -- Resource naming, HTTP method semantics, HATEOAS, content negotiation, and the Richardson Maturity Model with concrete before/after examples.
**Versioning Strategies** -- URI path, query param, header, and content-type versioning compared with migration playbooks.
**Pagination & Filtering** -- Offset, cursor, keyset, and time-based pagination with Python implementations. Field filtering, sorting, full-text search patterns.
**Error Handling** -- RFC 7807 Problem Details, error envelopes, retry-friendly status codes, and a complete error response catalog in JSON.
**Idempotency & Caching** -- Idempotency keys, conditional requests (ETags, If-Match, If-None-Match), Cache-Control strategies, and stale-while-revalidate patterns.

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