Json Encode Pure

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Like json_encode_with_error but has pure coeffects

function json_encode_pure(
  mixed $value,
  inout ?(int, string) $error,
  int $options = 0,
  int $depth = 512,
): mixed;

Encoding objects implementing JsonSerializable with an impure jsonSerialize will result in coeffect violations.

Parameters

• mixed $value
• inout ?(int, string) $error
• int $options = 0
• int $depth = 512

Returns

• mixed