Web / Caddy Server Interview questions
Why do we use the Caddyfile instead of writing JSON directly?
Every Caddy feature exists in JSON first, so technically nothing requires a Caddyfile. Teams reach for it anyway because it removes repetitive boilerplate: a two-line Caddyfile site block can expand into dozens of lines of nested JSON once matchers, handlers, and routes are spelled out explicitly.
The Caddyfile is also easier to review in a pull request, easier to template with environment placeholders, and closer to what most operators are used to from Nginx or Apache config files. It compiles down to the same JSON structure Caddy runs internally, via caddy adapt, so there's no functional gap for common use cases.
JSON becomes the better choice when you need a feature that has no Caddyfile directive yet, when config is generated programmatically by another system, or when you're pushing partial updates through the admin API's structured endpoints rather than reloading a whole file.
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