It really depends on many factors, one important is where in the world you get hired. Salaries are not the same everywhere.

Second is your experience, but I assume it's not much since you say junior? In any case here, the companies will look at how much value you add to their business. Remember that everything in business is the bottom line, so you need to add more value than you cost.

You can look here larajobs.com but I don't think they expose salaries.