Didn't like the other Delphi JSON parsers out there. They seemed too complicated for the simple task i had for JSON.
So this is my go at it.
This version is only tested on Delphi XE 3, Delphi XE 6 (Android) and Delphi 10 but should work for all Delphi versions that support generics and TStringHelper.
- Exception if the JSON text is not valid.
- Convert to string
- Serialization and deserialization from/to objects.
Just include the djson.pas file in your uses list for this to work.
{
"username": "thomas",
"name": "Thomas",
"photos": [
{
"title": "Photo 1",
"urls": {
"small": "http://example.com/photo1_small.jpg",
"large": "http://example.com/photo1_large.jpg"
}
},
{
"title": "Photo 2",
"urls": {
"small": "http://example.com/photo2_small.jpg",
"large": "http://example.com/photo2_large.jpg"
}
}
],
"int_list": [
1,
2,
3
]
}var
user: TdJSON;
photo: TdJSON;
i: TdJSON;
begin
user := TdJSON.parse({JSON_TEXT});
try
writeln('Username: '+ user['username'].AsString);
writeln('Name: '+ user['name'].AsString);
// Photos
for photo in user['photos'] do
begin
writeln('Title: ' + photo['title'].AsString);
writeln('Small url: ' + photo['urls']['small'].AsString);
writeln('Large url: ' + photo['urls']['large'].AsString);
end;
// Int list
for i in user['int_list'] do
begin
writeln(i.AsInteger);
end;
finally
user.free;
end;
end;[
{
"username": "thomas",
"name": "Thomas"
},
{
"username": "kurt",
"name": "Kurt"
},
{
"username": "bent",
"name": null
}
]var
users: TdJSON;
user: TdJSON;
begin
users := TdJSON.Parse({JSON_TEXT});
try
for user in users do
begin
writeln(user['username'].AsString);
if (not user['name'].IsNull) then
writeln(user['name'].AsString);
end;
finally
users.Free;
end;
end;The MIT License (MIT)
Copyright (c) 2018 Thomas Erlang
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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