REST API Data Formats: JSON, XML, and CSV Response Best Practices
Design REST APIs that return JSON, XML, or CSV. Use Accept headers for content negotiation, version your schema, and document response shapes clearly.
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Tags: api, rest, data-formats
REST API Data Formats: JSON, XML, and CSV Response Best Practices Choosing a response format for your REST API is not a "pick JSON and move on" decision once you serve enterprise clients, bulk data exports, or legacy systems that predate JSON dominance. Getting this right means fewer integrations that break, fewer bespoke client adapters, and response payloads that stay reasonably sized as your dataset grows. This guide covers the practical tradeoffs, the mechanics of content negotiation, and the envelope patterns that hold up across formats. XML: When You Cannot Avoid It XML is heavier than JSON — more bytes, more parsing overhead, and more tooling ceremony. But several contexts make it the right choice: SOAP integrations with older enterprise systems (banking, insurance, government) EDI…
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