Is Jesus the Creator?
No. As we usually see when this question is asked in a variety of ways, the same verses are usually referred to - however they are usually misapplied or misunderstood.
Let's examine the ones used by OP. We'll get to Jesus' role in creation shortly.
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made…and the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth. John 1:1-14
John is not talking about Jesus here. The logos is not yet Jesus because Jesus was not yet born. While that may sound odd, it is true if we allow scripture to speak freely unburdened by traditional interpretations. Jesus was born ~4BC so could not possibly be 'in the beginning' or the Creator.
For by him (Jesus Christ) were all things created, that are in heaven, and that are in earth, visible and invisible, whether thrones, or dominions, or principalities, or powers: all things were created by him, and for him. Col 1:16
Notice the easy give away if we are looking to read the text or believe what we are told it says. "in heaven" and "in (or on) earth" This cannot be talking about a Genesis creation -
In the beginning God created the heavens and the earth Gen 1:1
God doesn't inspire the wrong words, clumsy words or confusing words. Colossians' context is of the new creation and the church. Keep reading
all things have been created through Him and for Him
Not BY him! Jesus will come to have first place in everything. Why? Because he didn't have first place before he was born in anything except as the key to God's plan of salvation for all men.
He is before all things, and in Him all things hold together. 18 He is also the head of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will come to have first place in everything.
That's why he said to the Jews - 'before Abraham was, I am'. Not because he was God, but because God had planned for him to come "in these last days" (Heb 1:1) well before Abraham existed.
Jesus' role in God's plan was far more important than Abraham's.
and to enlighten all people as to what the plan of the mystery is which for ages has been hidden in God, who created all things Eph 3:9
Note: "through Jesus Christ" in OP quote is an addition in the KJV and a couple others. So God created, we know from many places that Jesus isn't God - he is the image and form of God, but Jesus is not the Creator of Genesis. This understanding can only be obtained by inference, speculation, addition and mis-reading the word God has provided. Paul and Jesus have been quite clear about who God is and who Jesus is. Creation is not attributed to Jesus - he wasn't born yet. But all things realise their eternal destiny, just as God planed, through Jesus.
Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent. John 17:3
yet for us there is but one God, the Father, from whom all things came and for whom we live; and there is but one Lord, Jesus Christ, through whom all things came and through whom we live. 1 Cor 8:6