Another json4s incompatibility - utf-8 escaping for €

[François ARMAND - Rudder]

Hello, 

We are also testing the migration to lift 4/json4s, and we fumbled upon an escape problem: there is too many UTF-8 symbols escaped, in particular the "€" one, which is a difference from lift-json (and I think most JSON frameworks). 

We found a reference to that fact in that issue message: https://github.com/json4s/json4s/issues/750#issuecomment-761571297 
But it doesn't look to have been followed by an other issue/PR. 
Should I open a ticket in json4s github? 

Thanks, 

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[Andreas Joseph Krogh]

The issue you link to is closed, is this still a problem?

What exactly doesn't work in current master ?

Do you have any sample code showcasing the  problem?

 

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Andreas Joseph Krogh

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[François ARMAND - Rudder]

On 05/02/2026 14:57, Andreas Joseph Krogh wrote:

The issue you link to is closed, is this still a problem?

What exactly doesn't work in current master ?

Do you have any sample code showcasing the  problem?

Yes, sorry I wasn't clear: it's the specific comment on that closed issue, which was dealing with the escaping of € and other utf-8 symbols that should not. I believe an other issue should have been opened, but I didn't find any. 

The test case in the comment still apply: 

scala> println(pretty(render(JString("€"))))
"\u20ac"

In lift-json, we get "€". 

And the following part of the comment still seems to be the case in master: 

The code to determine the target of escaping is as follows, but it is excessive.

(c >= '\u0000' && c <= '\u001f') || (c >= '\u0080' && c < '\u00a0') || (c >= '\u2000' && c < '\u2100')

In particular the intervalle between 2000 and 2100 contains a lot of standard UTF-8 symbol. Perhaps it should be 2070 if the intent was to avoid punctuation and spaces?

To view this discussion visit https://groups.google.com/d/msgid/liftweb/VisenaEmail.8.8c3c2478fec4ce88.19c2e1610d2%40origo-test01.app.internal.visena.net.