TryCF Gist

trycf-gist-1649448238741-9561c764-3391-4869-b0ec-d7569546366b.cfm

<cfscript>
// Single parents
//apiData = [{"id":13},{"id":16},{"id":17},{"id":18},{"id":14},{"id":15}];

// parents with one nested level of children
//apiData = [{"id":16},{"id":13,"children":[{"id":14}]},{"id":17,"children":[{"id":15}]},{"id":18}];

// parents with two nested levels of children
apidata =  [{"id":10},{"id":13,"children":[{"id":14,"children":[{"id":15}]}]},{"id":2,"children":[{"id":5,"value":"Item 5 value","foo":"Bar","children":[{"id":6},{"id":7},{"id":8}]},{"id":3},{"id":4}]},{"id":9},{"id":1},{"id":16},{"id":17}];

function printTree(data, indent="", result=""){
    for (child in data) { // First level
        if(len(indent)) result &= indent & "└"; //only add the indent if a child
        
        result &= child.id & "<br>"; //print id with a break
        
        if(structKeyExists(child,"children")) //if there are children recurse with a deeper indent
            result &= printTree(child["children"], indent & "&nbsp;&nbsp;"); 
    }
    return result;
}
echo(printTree(apidata));
</cfscript>