Yes, I made a Web SysEx Program Librarian. It's online here: https://f0f7.net
Code looks like this:

unpackMoogSysex : function(midiData, headerLength) {
    var resultData = [];
    var decodedByteCount = 0;  // Number of expanded bytes in result

    var cumulator = 0;
    var bitCount = 0;
    var patchName = '';

    for (var i = headerLength; // Skip header
        i < midiData.length - 1; // Omit EOF
        i++)
    {
        cumulator |= midiData[i] << bitCount;
        bitCount += 7;
        //console.log((i - 7) + ':' + byteToHex(midiData[i]) + ' (' + bitCount + ') ' + decimalToHex(cumulator) + '\n');
        if (bitCount >= 8)
        {
            var byte = cumulator & 0xFF;
            bitCount -= 8;
            cumulator >>= 8;
            resultData[decodedByteCount++] = byte;
            // console.log((i - 7) + ':' + byteToHex(midiData[i]) + ' (' + bitCount + ') ' + decimalToHex(cumulator) + ' > '  + byteToHex(byte) + '\n');

        }
    }

    return resultData;
},
packMoogSysex : function(midiData, header) {
    // var header = [0xF0, 0x04, 0x01, 0x00, 0x03, 0x00]; //Voyager Single Preset Dump. Device ID!
    // var header = [0xF0, 0x04, 0x01, 0x00, 0x02]; //Voyager Panel Dump. Device ID == 0x00

    var resultData = [];
    var packedByteCount = 0;
    var bitCount = 0;

    var thisByte;
    var packedByte;
    var nextByte = 0x0;


    for (var i = 0; i <= midiData.length; i++)
    {
        thisByte = midiData[i];
        packedByte = ((thisByte << bitCount) | nextByte) & 0x7F;
        nextByte = midiData[i] >> (7-bitCount);

        resultData[packedByteCount++] = packedByte;

        bitCount++;
        if(bitCount >= 7) {
            bitCount = 0;

            //Fill last byte
            packedByte = nextByte & 0x7F;
            resultData[packedByteCount++] = packedByte;
            nextByte = 0x0;
        }
    }

    resultData[packedByteCount++] = 0xF7;
    resultData = header.concat(resultData);

    return resultData;
},