Is N and O ionic or covalent?

1. Nitrogen and oxygen exist as a molecule$\left({\mathrm{N}}_2\mathrm{and}{\mathrm{O}}_2\right)$ and they form bonds by sharing electrons with other atoms or themselves.
2. Nitrogen forms a triple covalent bond with another nitrogen atom$\left(\mathrm{N}\equiv \mathrm{N}\right)$ and oxygen forms a double covalent bond with another oxygen atom$\left(\mathrm{O}=\mathrm{O}\right)$.

Hence, nitrogen$\left(\mathrm{N}\right)$ and oxygen$\left(\mathrm{O}\right)$ are covalent.