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Personal biais: the mORMot 2 Open Source framework has a very efficient JSON library, and several ways to use it: - from RTTI, using classes, records, collections, dynamic arrays, mORMot generics... - from variants, and a custom "document" variant type to store JSON objects or arrays... - from high-level IDocList / IDocDict holders. See https://blog.synopse.info/?post/2024/02/01/Easy-JSON-with-Delphi-and-FPC It is perhaps the fastest library available, working on Delphi and FPC, with unique features, like: list := DocList('[{"a":10,"b":20},{"a":1,"b":21},{"a":11,"b":20}]'); // sort a list/array by the nested objects field(s) list.SortByKeyValue(['b', 'a']); assert(list.Json = '[{"a":10,"b":20},{"a":11,"b":20},{"a":1,"b":21}]'); // create a dictionary from key:value pairs supplied from code dict := DocDict(['one', 1, 'two', 2, 'three', _Arr([5, 6, 7, 'huit'])]); assert(dict.Len = 3); // one dictionary with 3 elements assert(dict.Json = '{"one":1,"two":2,"three":[5,6,7,"huit"]}'); // convert to JSON with nice formatting (line feeds and spaces) Memo1.Caption := dic.ToString(jsonHumanReadable); // integrated search / filter assert(DocList('[{ab:1,cd:{ef:"two"}}]').First('ab<>0').cd.ef = 'two');