Put on a happy face

This time we are looking on the crossword puzzle clue for: Put on a happy face.
it’s A 19 letters crossword definition.
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Possible Answers:

SMILE.

Last seen on: Wall Street Journal Crossword – June 22 2019 – Terminus

Random information on the term “SMILE”:

Smile is a computer data interchange format based on JSON. It can also be considered as a binary serialization of generic JSON data model, which means that tools that operate on JSON may be used with Smile as well, as long as proper encoder/decoder exists for tool to use.The name comes from first 2 bytes of the 4 byte header, which consist of Smiley “:)” followed by a linefeed: choice made to make it easier to recognize Smile-encoded data files using textual command-line tools.

Compared to JSON, Smile is both more compact and more efficient to process (both to read and write).Part of this is due to more efficient binary encoding (similar to BSON, CBOR and UBJSON), but an additional feature is optional use of back references for property names and values.Back referencing allows replacing of property names and/or short (64 bytes or less) String values with 1- or 2-byte reference ids.

Libraries known to support Smile include:

SMILE on Wikipedia