Question 1

How to encode a nested map to JSON in Elixir?

Accepted Answer

Use `JSON.encode/1` with your nested map; it recursively converts Elixir maps and lists to JSON objects and arrays. For instance, `JSON.encode(%{data: %{nested: true}})` outputs a valid JSON string with nested structure.

Question 2

Elixir JSON or Jason: which is better for my project?

Accepted Answer

Elixir JSON is simpler and native, good for basic JSON tasks, while Jason offers more features and better performance via NIFs. If you need speed or advanced parsing, Jason is typically preferred; otherwise, Elixir JSON works for straightforward use.

Question 3

How to handle errors when JSON decoding fails?

Accepted Answer

The `JSON.decode/1` function returns a tuple like {:ok, result} or {:error, reason}, so you can pattern match to manage errors. For example, use case statements to log issues or provide fallback data in your application.

Question 4

Can I use Elixir JSON with Phoenix for building APIs?

Accepted Answer

Yes, it integrates well with Phoenix by encoding responses and decoding requests in controllers. Add it as a dependency in mix.exs and call the encode/decode functions in your action handlers to handle JSON payloads.

Question 5

How to enable verbose logging for JSON library debugging?

Accepted Answer

Add `config :json, log_level: :debug` to your application's config file, along with setting the logger level, as shown in the README. This provides detailed logs specific to JSON operations for troubleshooting.

Question 6

Does Elixir JSON support streaming large JSON files?

Accepted Answer

No, Elixir JSON does not support streaming; it's designed for complete JSON strings. For streaming large datasets, consider libraries like Jason or implement custom chunked parsing, as this library lacks built-in streaming capabilities.

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