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Candid Specification

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Summary of the Candid interface description language. Cover the type system (primitive types, composite types, service types), binary encoding format, subtyping rules for safe interface evolution, and links to the full specification. This page serves as a developer-friendly overview, not a duplication of the full spec.

  • Portal: references/candid-spec
  • guides/canister-calls/candid — practical Candid usage
  • reference/ic-interface-spec — Candid in the IC spec context
  • guides/canister-calls/binding-generation — generating code from Candid