Page 13 - REST-API

Upload endpoints are a common source of errors in REST APIs. Incorrectly documented content types, missing validation and incomplete tests turn them into a black box. This guide shows how to correctly describe Symfony upload endpoints with OpenAPI 3.1, secure them on the server side and test them fully with PHPUnit.

Replacing an existing REST API with GraphQL in one shot is the surest way to trigger production outages. With a BFF layer, the strangler fig pattern, and a clear rollout plan, you can migrate REST to GraphQL while both protocols coexist safely, side by side, for months.

The category page is the most important performance hotspot in almost every Magento shop. Too many fields, resolver chains that run too deep, and missing caching strategies make it slower than it needs to be. The lever is in the query, not the server.

Nested resources such as order items under an order look intuitive at first glance, but if used without thought they quickly lead to cluttered URL structures and duplicated authorization logic. This article shows how to cleanly model subresources in API Platform through uriTemplate and when a standalone resource is the better choice.

A REST API that never makes breaking changes is an API that never truly evolves. Teams that plan deprecations, sunset dates and migration paths from the start can evolve their APIs deliberately, without losing integrators or breaking them without warning.

Poor API documentation costs frontend teams hours on follow-up questions that never needed to be asked. A consistent response structure, machine-readable error formats and complete typing turn an API specification into a tool that frontend developers can use productively from day one.

For years webhooks were described outside the actual API documentation, in separate Markdown files that nobody kept up to date. OpenAPI 3.1 brings the new webhooks object, which anchors webhook payload schemas, security requirements and retry behavior directly in the specification.

Anyone who implements an API before the design is settled blocks frontend teams and forces QA engineers into manual follow-up. API-first reverses the order: the OpenAPI specification comes first, enabling mocking for the frontend and contract tests for QA, so all teams can develop in parallel without waiting on each other.

Unlimited APIs are an open door for abuse, scraping and accidental overload caused by misbehaving clients. This article explains how fixed window, sliding window and token bucket algorithms work, how to configure sensible rate limits per IP address or API key and how gateway layer and application logic can be combined in Magento environments with Redis to keep systems stable and fair.

CSV exports from ERP systems, inventory management, or legacy databases almost always need to become JSON before they can be imported into modern APIs. A CSV to JSON pipeline built from mlr, jq, and Bash glue code handles type coercion, nesting, and validation without a single line of Python.