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Countries standards like ISO3166, flags (png, svg in 4x3 and 1x1), phone prefix and currency codes packed in a JSON... something like:
    [
    ...
    {
        "name": "Tuvalu",
        "prefix": "688",
        "currency": "Australian Dollar",
        "alpha2": "TV",
        "alpha3": "TUV",
        "images": {
            "svg_square": "./build/flags/svg/1x1/tv.svg",
            "svg": "./build/flags/svg/4x3/tv.svg",
            "png_square": "./build/flags/png/1x1/tv.png",
            "png": "./build/flags/png/4x3/tv.png"
        }
    },
    ...
    ]

Example: Countries badge with d3js & topojson