Google comes up with this: json2excel.
Or write your own little application.
EDIT
I decided to be nice and write a python3 application for you. Use on the command line like this python jsontoxml.py infile1.json infile2.json and it will output infile1.json.xml and infile2.json.xml.
#!/usr/bin/env python3
import json
import sys
import re
from xml.dom.minidom import parseString
if len(sys.argv) < 2:
    print("Need to specify at least one file.")
    sys.exit()
ident = " " * 4
for infile in sys.argv[1:]:
    orig = json.load(open(infile))
    def parseitem(item, document):
        if type(item) == dict:
            parsedict(item, document)
        elif type(item) == list:
            for listitem in item:
                parseitem(listitem, document)
        else:
            document.append(str(item))
    def parsedict(jsondict, document):
        for name, value in jsondict.items():
            document.append("<%s>" % name)
            parseitem(value, document)
            document.append("</%s>" % name)
    document = []
    parsedict(orig, document)
    outfile = open(infile + ".xml", "w")
    xmlcontent = parseString("".join(document)).toprettyxml(ident)
     #http://stackoverflow.com/questions/749796/pretty-printing-xml-in-python/3367423#3367423
    xmlcontent = re.sub(">\n\s+([^<>\s].*?)\n\s+</", ">\g<1></", xmlcontent, flags=re.DOTALL)
    outfile.write(xmlcontent)
Sample input
{"widget": {
    "debug": "on",
    "window": {
        "title": "Sample Konfabulator Widget",
        "name": "main_window",
        "width": 500,
        "height": 500
    },
    "image": { 
        "src": "Images/Sun.png",
        "name": "sun1",
        "hOffset": 250,
        "vOffset": 250,
        "alignment": "center"
    },
    "text": {
        "data": "Click Here",
        "size": 36,
        "style": "bold",
        "name": "text1",
        "hOffset": 250,
        "vOffset": 100,
        "alignment": "center",
        "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
    }
}}
Sample output
<widget>
    <debug>on</debug>
    <window title="Sample Konfabulator Widget">
        <name>main_window</name>
        <width>500</width>
        <height>500</height>
    </window>
    <image src="Images/Sun.png" name="sun1">
        <hOffset>250</hOffset>
        <vOffset>250</vOffset>
        <alignment>center</alignment>
    </image>
    <text data="Click Here" size="36" style="bold">
        <name>text1</name>
        <hOffset>250</hOffset>
        <vOffset>100</vOffset>
        <alignment>center</alignment>
        <onMouseUp>
            sun1.opacity = (sun1.opacity / 100) * 90;
        </onMouseUp>
    </text>
</widget>