Best Format for API Response Payloads

JSON is the default for most APIs; Proto is best for strict contracts and high-throughput services.

Recommended Default

JSON (Document)

JSON has universal tooling and easy debugging in API workflows.

Files available: 4

application/json

Open Samples Open Hub Manifest

Alternatives

PROTO (Data)

Files: 4

Use Proto for typed schemas and compact transport.

Samples Hub

GRAPHQL (Data)

Files: 4

Use GraphQL schema contracts where query flexibility is required.

Samples Hub

Related Comparisons

Protocol Buffers vs JSON

Compare schema-first .proto contracts against flexible JSON payloads.

Open Comparison

GraphQL Schema vs JSON

Contrast GraphQL type definitions with JSON document payload structures.

Open Comparison

Explore Related Pages

Format FAQs

GRAPHQL FAQ JSON FAQ PROTO FAQ

Comparisons

CSV vs JSON JSON vs JSONL Protocol Buffers vs JSON GraphQL Schema vs JSON Access Log vs JSON Log

Best Format Guides

Best Data Format for APIs Best Log Format for Observability

Use-Case Recommendations

Best Format for Realtime Event Streams Best Format for Spreadsheet Data Export Best Format for Analytics Event Ingestion Best Format for Server Access Log Pipelines Best Format for SIEM-Friendly Operational Logs

How to Convert

How to Convert ACCESSLOG to JSON How to Convert CSV to JSON How to Convert GRAPHQL to JSON How to Convert JSON to ACCESSLOG How to Convert JSON to CSV How to Convert JSON to GRAPHQL How to Convert JSON to JSONL How to Convert JSON to PROTO