The actual data being sent in an HTTP request or response — the "cargo" of the message.
A payload is the actual data being sent in an HTTP request or webhook. When you submit a form, the payload is the form data. When an API returns results, the response payload is the data you asked for (usually JSON).
Payloads travel between frontends and backends through endpoints and REST APIs. Edge Functions process payloads. Middleware can validate payload structure. Understanding payloads helps you debug API issues — checking what data was sent and received.
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