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Learn how to control JSON output from Go structs using struct tags and the encoding/json package in this 10-minute tutorial. Discover how struct field names affect JSON encoding by default and master the use of JSON tags to customize the encoded result. Explore why only exported fields appear in JSON output and understand how the encoding/json package converts structs to JSON with json.Marshal. Master JSON tag syntax like `json:"fieldname"` to set custom key names, which is essential when building APIs that require lowercase or snake_case formatting. Understand the omitempty option to automatically remove fields with zero values from the output, making it perfect for handling optional fields in API responses. Build on your existing struct knowledge to prepare for creating JSON responses in HTTP handlers and working with external services that expect specific JSON formats. Practice with the included challenge to reinforce your understanding of struct tags, field visibility rules, and JSON encoding behavior in Go.
