That's what syntax highlighting is for. I use notepad++ for YAML. Besides coloring what it thinks I'm thinking, it displays vertical lines corresponding to the

That's what syntax highlighting is for. I use notepad++ for YAML. Besides coloring what it thinks I'm thinking, it displays vertical lines corresponding to the indentation levels. (I prefer INI/TOML whenever I can help it; hierarchies in TOML are so counterintuitive that it incentivizes a simple flat structure. But then, some things are irremediably hierarchical)