How does the story of Jonah relate to God's judgment?

The narrative of Jonah serves as a poignant reminder of God's judgment against sin, as well as His incredible mercy towards those who turn from their wickedness. In Jonah 1, God commands Jonah to preach against Nineveh for their great wickedness. This illustrates that God does not overlook sin; judgment is certain for those who remain unrepentant. However, in Jonah 3, when the people of Nineveh respond to the warning with repentance, God relents from bringing the calamity He had pronounced (Jonah 3:10). This dynamic showcases God's character: He is just, and He rightfully judges sin, yet He is also merciful, willing to forgive those who humbly turn to Him. The ultimate fulfillment of God's justice and mercy culminates in the person and work of Jesus Christ, making it clear that repentance leads to mercy and grace.