JSON is the default API lingua franca, but inconsistent formatting, ambiguous types, and leaky errors cause integration bugs. These best practices cover schema discipline, logging hygiene, validation, and using JSON Formatter during development.
주요 시사점
- Use consistent key naming (camelCase vs snake_case) per API surface and document it.
- Represent dates as ISO-8601 strings in UTC unless epoch milliseconds is explicitly standardized.
- Avoid breaking changes — additive fields are safer than renaming or type flips.
- Never return stack traces in production JSON error bodies.
- Validate payloads with JSON Schema or OpenAPI-generated validators at boundaries.
Structural conventions
Wrap collections with clear envelope keys (data, meta, errors) for pagination metadata. Include version headers or schema_version fields when mobile clients lag server deploys.
Null vs omitted fields communicate different semantics — document whether absent means “unknown” or “not applicable.”
Types, numbers, and booleans
JSON numbers are doubles — large integers (Twitter snowflakes) should be strings to avoid IEEE precision loss in JavaScript clients.
Booleans must be true/false, not "true" strings. Enums should be explicit string constants, not magic integers, unless protobuf-style int enums are documented.
Error JSON done right
Return machine-readable codes (USER_NOT_FOUND) plus human messages and optional field-level validation arrays. Map HTTP status codes consistently: 422 for validation, 409 for conflicts.
Debugging with JSON Formatter
Paste staging responses to collapse noise during triage. Minify before signing HMAC webhooks to match server canonicalization rules.
Pair with JWT Decoder when errors embed token claims in nested error.details objects.
Security considerations
Disable verbose JSON errors in production. Redact PII in logs — pretty-printed JSON in log aggregators becomes a compliance liability.
자주 묻는 질문
Should APIs pretty-print JSON responses?
Optional in dev; gzip-compressed minified JSON is standard in production for latency.
JSON or XML in 2026 greenfield APIs?
JSON default; XML for legacy enterprise integrations only.
How do I document JSON APIs?
OpenAPI 3.1 with examples and JSON Schema components; generate clients where possible.
What about JSON Lines for logs?
NDJSON suits streaming logs and ETL — different from REST response bodies.
Trailing commas in JSON?
Invalid per spec — JSON Formatter flags them before they break mobile parsers.
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