data.json

[
    {
        "class": "number",
        "html": "1"
    },
    {
        "class": "number",
        "html": "2"
    },
    {
        "class": "number",
        "html": "3"
    },
    {
        "class": "operator",
        "html": "+"
    },
    {
        "class": "number",
        "html": "4"
    },
    {
        "class": "number",
        "html": "5"
    },
    {
        "class": "number",
        "html": "6"
    },
    {
        "class": "operator",
        "html": "-"
    },
    {
        "class": "number",
        "html": "7"
    },
    {
        "class": "number",
        "html": "8"
    },
    {
        "class": "number",
        "html": "9"
    },
    {
        "class": "operator",
        "html": "*"
    },
    {
        "class": "operator",
        "html": "."
    },
    {
        "class": "number",
        "html": "0"
    },
    {
        "class": "operator",
        "html": "="
    },
    {
        "class": "operator",
        "html": "/"
    }
]