record json response into an array

Or to step back one step further, consider just using the data from the Slurper result directly.

In your case, your JSON is a bit unusual because it labels the objects as "1" and "2" etc

        "responseRecherche": {
            "1": { ... },
            "2": { ... },

Instead of just giving a list as I would normally have expected:

        "responseRecherche": [
            { ... },
            { ... },

So, yes, in this case it might make sense to partially transform it, into a proper list (not unlike what Rao has suggested):

dumeAcheteurs = new groovy.json.JsonSlurper()
 .parseText(jsonString)
 .response
 .responseRecherche
 .collect { keyName, keyValue -> keyValue } // creates a list from the values behind "1" and "2", ignoring those names for them
 .collect { it.dumeAcheteur }

Here you're still keeping the whole objects rather than only pulling out a specific subset. And you can just access what you need directly:

assert dumeAcheteurs[0].Id == "azertyui"
assert dumeAcheteurs[1]."Date de création" == "2018-03-21 10:41:05"
// etc

Hello

thank you for your answers :smileyhappy:

yesterday we didnt work in france. so i look this morning. 

I tried quick code with $i but it doesnt' work :(

After, i try last code with collect function, and it runs very good. 

i can check all dates before or after a given date, i am very happy to that. thank you so much.

jhunt, yes, this json is a little weak format json, but it is maken by a junior, so ok. in fact, your are a genius :smileywink: