Add is valid json Twig test

[qdequippe]

Add is valid json Twig test using json_validate PHP function

[stof]

What is the use case for having this in Twig templates ?

And this looks like a good candidate for a Twig test instead, exposing an API like value is valid json instead of json_validate(value)

[qdequippe]

What is the use case for having this in Twig templates ?

My use case is when I want to display http response content, if content is a valid json a CSS class is applied

And this looks like a good candidate for a Twig test instead, exposing an API like value is valid json instead of json_validate(value)

Good point Twig test is a better choice for this, I will update the PR

[stof]

I'm not sure this use case is common enough to ship that in Twig itself. I will let @fabpot give his opinion on this too.

However, this does not prevent registering a Twig test in your own project needing this.

[qdequippe]

I'm not sure this use case is common enough to ship that in Twig itself. I will let @fabpot give his opinion on this too.

Of course it's just a proposal :)

[stof]

this won't accept strings

[fabpot]

I don't think it should be part of core.