In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through Him, and without Him nothing was made that was made. In Him was life, and the life was the light of men. And the light shines in the darkness, and the darkness did not comprehend it.
There was a man sent from God, whose name was John. This man came for a witness, to bear witness of the Light, that all through him might believe. He was not that Light, but was sent to bear witness of that Light. That was the true Light which gives light to every man coming into the world.
He was in the world, and the world was made through Him, and the world did not know Him. He came to His own, and His own did not receive Him. But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
And the Word became 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 bore witness of Him and cried out, saying, “This was He of whom I said, ‘He who comes after me is preferred before me, for He was before me.’”
And of His fullness we have all received, and grace for grace. For the law was given through Moses, but grace and truth came through Jesus Christ. No one has seen God at any time. The only begotten Son, who is in the bosom of the Father, He has declared Him. - John 1:1-18
The "logos" (Word) that was with God from the beginning and is God, became flesh and dwelt among us. This is of course referring to the incarnation of Jesus Christ, and unequivocally and beyond any shadow of a doubt confirms that Jesus is God.
So all this was done that it might be fulfilled which was spoken by the Lord through the prophet, saying: “Behold, the virgin shall be with child, and bear a Son, and they shall call His name Immanuel,” which is translated, “God with us.” - Matthew 1:22-23
Then the Jews said to Him, “You are not yet fifty years old, and have You seen Abraham?”
Jesus said to them, “Most assuredly, I say to you, before Abraham was, I AM.” - John 8:57-58
Everyone who has read Scripture understands what Jesus saying "I AM" means. (Which is why they tried to stone Him when He said those words)
And God said to Moses, “I AM WHO I AM.” And He said, “Thus you shall say to the children of Israel, ‘I AM has sent me to you.’” - Exodus 3:14