Use plain javascript to generate bmp file.

index.js

function drawArray(arr) {
    /*
    Thanks original author @vukicevic
    Usage:
    Pass a two-dimensional arrary.
    The first dimonsion is rows, the second one is columns.
    Note that in columns, each pixel is represented by four nums as BGRA, so the columns' length is four times as image's length.

    return image's base64 code.
    */
    var offset, height, width, size, data, image;

    function bytes2(num) {
        return String.fromCharCode(num & 0xff, (num >> 8) & 0xff);
    }

    function bytes4(num) {
        return String.fromCharCode(num & 0xff, (num >> 8) & 0xff, (num >> 16) & 0xff, (num >> 24) & 0xff);
    }

    offset = 54;
    height = arr.length;
    width = Math.floor(arr[0].length / 4);
    size = height * width;

    //BMP Header
    data = 'BM';                       // ID field
    data += bytes4(offset + size);     // BMP size
    data += bytes4(0);                 // unused
    data += bytes4(offset);            // pixel data offset

    //DIB Header
    data += bytes4(40);                // DIB header length
    data += bytes4(width);             // image width
    data += bytes4(height);            // image height
    data += bytes2(1);                 // colour panes
    data += bytes2(32);                // bits per pixel
    data += bytes4(0);                 // compression method
    data += bytes4(size);              // size of the raw data
    data += bytes4(0);                 // horizontal print resolution
    data += bytes4(0);                 // vertical print resolution
    data += bytes4(0);                 // colour palette, 0 == 2^n
    data += bytes4(0);                 // important colours

    //Pixel data
    for (var h_pixel = height - 1; h_pixel >= 0; h_pixel--) {
        data += String.fromCharCode.apply(null, arr[h_pixel]);
    }

    //Image element
    image = 'data:image/bmp;base64,' + btoa(data);

    return image;
}


// test case, a random 200x200 image.
for (var a = [], i = 0; i < 200; i++) {
    for (var b = [], j = 0; j < 800; j++) {
        b[j] = Math.floor(Math.random() * 256);
    }
    a[i] = b;
}

drawArray(a)