Recommendations for best JSON lib?

[Arjan]

On Sunday, 21 April 2019 at 02:09:29 UTC, evilrat wrote:
> On Saturday, 20 April 2019 at 20:44:22 UTC, Guillaume Piolat 
> wrote:
>> On Saturday, 20 April 2019 at 18:49:07 UTC, Nick Sabalausky
>
> I also tried experimental std json, asdf and vibe.d.
> The only one that worked for me is vibe.d JSON subpackage, and

What was the problem with asdf? I've succesfully used it in the 
past.