How do you compare large JSON responses, logs, and configuration files

While debugging applications, I often find myself comparing:

• API responses before and after code changes

• JSON payloads from different environments

• Configuration files

• Generated HTML output

• Log files

Git is great for tracking committed changes, but many of these comparisons happen outside a repository or involve temporary snippets copied from browsers, terminals, or API tools.

I've experimented with several approaches, including IDE diff tools, command-line utilities, and online comparison tools.
I'm curious how others handle this.

• What tools do you use for comparing text or code?

• Do you prefer IDE integrations, command-line tools, or web-based tools?

• Are there any features that you consider essential when comparing large files or API responses?