Perhaps not everyone will accept the judgment of Media Bias Fact Check, but I find their ratings mostly fair and based more on verifiably failed fact checks and the like than editorial opinion.
They rate NPR as having a left-center bias and high factual reporting. The bias is based on story selection rather than the reporting itself containing substantial bias.
They rate Fox News as having a right bias and mixed factual reporting. The bias based is on editorial positions and they note that news reports are generally accurate, but commentary often isn't.
If that seems unfair, consider that they rate MSNBC comparably to Fox with left bias and mixed factual reporting, though they do give it a slightly higher overall credibility rating.
They rate NPR as having a left-center bias and high factual reporting. The bias is based on story selection rather than the reporting itself containing substantial bias.
They rate Fox News as having a right bias and mixed factual reporting. The bias based is on editorial positions and they note that news reports are generally accurate, but commentary often isn't.
If that seems unfair, consider that they rate MSNBC comparably to Fox with left bias and mixed factual reporting, though they do give it a slightly higher overall credibility rating.
https://mediabiasfactcheck.com/npr
https://mediabiasfactcheck.com/fox-news
https://mediabiasfactcheck.com/msnbc/