VSVverkeerskunde/gvq-api

// https://gist.github.com/mathewbyrne/1280286#gistcomment-2588056
function slugify(text) {
    text = text.toString().toLowerCase().trim();

    const sets = [
        {to: 'a', from: '[ÀÁÂÃÄÅÆĀĂĄẠẢẤẦẨẪẬẮẰẲẴẶ]'},
        {to: 'c', from: '[ÇĆĈČ]'},
        {to: 'd', from: '[ÐĎĐÞ]'},
        {to: 'e', from: '[ÈÉÊËĒĔĖĘĚẸẺẼẾỀỂỄỆ]'},
        {to: 'g', from: '[ĜĞĢǴ]'},
        {to: 'h', from: '[ĤḦ]'},
        {to: 'i', from: '[ÌÍÎÏĨĪĮİỈỊ]'},
        {to: 'j', from: '[Ĵ]'},
        {to: 'ij', from: '[IJ]'},
        {to: 'k', from: '[Ķ]'},
        {to: 'l', from: '[ĹĻĽŁ]'},
        {to: 'm', from: '[Ḿ]'},
        {to: 'n', from: '[ÑŃŅŇ]'},
        {to: 'o', from: '[ÒÓÔÕÖØŌŎŐỌỎỐỒỔỖỘỚỜỞỠỢǪǬƠ]'},
        {to: 'oe', from: '[Œ]'},
        {to: 'p', from: '[ṕ]'},
        {to: 'r', from: '[ŔŖŘ]'},
        {to: 's', from: '[ߌŜŞŠ]'},
        {to: 't', from: '[ŢŤ]'},
        {to: 'u', from: '[ÙÚÛÜŨŪŬŮŰŲỤỦỨỪỬỮỰƯ]'},
        {to: 'w', from: '[ẂŴẀẄ]'},
        {to: 'x', from: '[ẍ]'},
        {to: 'y', from: '[ÝŶŸỲỴỶỸ]'},
        {to: 'z', from: '[ŹŻŽ]'},
        {to: '-', from: '[·/_,:;\']'}
    ];

    for (let i = 0; i < sets.length; i++) {
        text = text.replace(new RegExp(sets[i].from, 'gi'), sets[i].to);
    }

    return text
        .replace(/\s+/g, '-')    // Replace spaces with -
        .replace(/[^\w-]+/g, '') // Remove all non-word chars
        .replace(/--+/g, '-')    // Replace multiple - with single -
        .replace(/^-+/, '')      // Trim - from start of text
        .replace(/-+$/, '')      // Trim - from end of text
}