Use pdoMenu for generate JSON tree of resources.

pdoJSON.modx

[[pdoMenu:striptags:htmlentities:strip?
  &lastClass=`last`
  &firstClass=``
  &hereClass=``
  &parentClass=``
  &rowClass=``
  &outerClass=``
  &innerClass=``
  &levelClass=``
  &selfClass=``
  &webLinkClass=``
  &tplOuter=`@INLINE [ {$wrapper} ]`
  &tplInner=`@INLINE {$wrapper}`
  &tplParentRow=`@INLINE { "{$alias}": {
    "title"     : "{$pagetitle}"
  , "parent"    : "{$id}"
  , "subfolder" : { {$wrapper} }
  } } {$classes | match : '*last*' ? '' : ','} `
  &tpl=`@INLINE "shop_{$id}" : {
    "name"      : "{$pagetitle}"
  , "title"     : "{$longtitle}"
  , "address"   : "{$description}"
  , "workTime"  : "{$introtext}"
  , "phoneCode" : "{$alias}"
  , "phone"     : "{$menutitle}"
  , "pickup"    : "{$published}"
  } {$classes | match : '*last*' ? '' : ','} `
]]