I have a field of type char into which a string with json code will be inserted from parsing:

custom_data = fields.Char()

and I need to display this json in the form of html. It is reliably known that the json code will contain only the key, value, lang fields, for example:

[{"key":"rdhh","value":"sdasd","lang":"sada"},{"key":"rd123hh","value":"sd123asd","lang":"sad123a"},{"key":"rdh111h","value": "s111dasd","lang":"sa11da"},{"key":"rd44hh","value":"42sdasd","lang":"s4ada"},{"key":"rdhh6","value":"sd5asd","lang":"sa7da"}]

I did this with numpy, pandas libraries but I keep getting the message that my json code is equal to a binary value, even after I set it to default="[]".

Here is the code of my implementation:

personalization_html = fields.Html(string="Product property", compute='_json_conf')

def _json_conf(self):
    cd = self.custom_data
    names = ["key", "value", "lang"]

    if cd == "[]":
        df = pd.DataFrame(columns=names)
    else:
        z = json.dumps(cd)
        y = json.loads(z)

        arrs = []
        for i in y:
            value = []
            value.append(i["key"])
            value.append(i["value"])
            value.append(i["lang"])

            arrs.append(value)

            a = np.array(arrs)

            df = pd.DataFrame(a, columns=names)

    return df.to_html(index=False)

I've been struggling with this for a week now, I've tried everything, but still nothing works...