I have a small crack in my front window of my car. Can someone do window repair or do I need to replace the entire window?

Genrally repairs are just for holes like when a rock first hits. sometimes small cracks can be fixed. You will probably have to replace it.

If the crack in your windshield is small enough you may be able to fix it yourself. There are windshield repair kits that inject a resin material into the crack, if it's too large for that it can be repaired by a professional without having to replace the entire windshield.