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Json Encode Pure

hphp/hack/manual/apis/Functions/json_encode_pure.md

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:::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

Hack
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
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