Orange juice
In most recipes, orange juice works well as a 1:1 alternative for lemon juice. Add the orange juice to your recipe in the same way that you would add the lemon juice. Compared to lemon juice, it is sweeter, less sour, and less acidic.
Use Seville oranges if you can when substituting orange juice for lemon juice. The bitterness of these oranges is more similar to the lemon flavor. But whatever orange juice you have in the refrigerator can be used if you don't have time to go shopping. If you use orange juice instead of lemon juice in recipes that call for a lot of lemon juice, the flavor may change substantially. But it's not a problem because most of the recipes only call for small amounts of lemon juice, so the juice from one medium-sized orange should be sufficient for your recipe.