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Validate or identify JSON objects and potential decoding issues using struct definitions.
License: Other
This project forked from clbanning/checkjson
Validate or identify JSON objects and potential decoding issues using struct definitions.
License: Other
Check that a JSON object's keys correspond to a struct's exported members or JSON tags. ANNOUNCEMENTS 2018.03.14 - Add ExistingJSONKeys() 2018.02.16 - Add test example of using go v1.10 (*Decoder)DisallowUnknownFields() 2017.02.13 - Handle "-" and "omitempty" JSON tags in struct definitions. 2017.02.08 - UnknownJSONKeys lists all JSON object keys that won't be decoded. 2016.11.18 - MissingJSONKeys lists all struct members that won't be set by JSON object. USAGE https://godoc.org/github.com/clbanning/checkjson Example: data := ` { "elem1":"a simple element", "elem2": { "subelem":"something more complex", "notes":"take a look at this" } "elem4":"extraneous" }` type sub struct { Subelem string `json:"subelem,omitempty"` Another string `json:"another"` } type elem struct { Elem1 string `json:"elem1"` Elem2 sub `json:"elem2"` Elem3 bool `json:"elem3"` } e := new(elem) result, _ := MissingJSONKeys([]byte(data), e) // result: [elem2.another elem3] result, _ = UnknownJSONKeys([]byte(data), e) // result: [elem2.notes elem4] // NOTE: using the stdlib json.Decoder with (*Decoder)DisallowUnknownFields() set // will error on the first unknown key; it does not return a slice of all // unknown keys - see: unknownfieldserr_test.go. LIMITATION This package does not support recursive struct definitions. MOTIVATION I make extensive use of JSON configuration files. Sometimes the files are large or complex and JSON keys can be prone to typos or case errors. The "encoding/json" decoder just ignores JSON keys that do not correspond to struct member names/tags; this can result in unexpected initialization errors or the failure to override defaults. The checkjson.Validate() function identifies JSON object keys that cannot be decoded to a member of the struct using the "encoding/json" package. RELATED There is a similar package for validating XML tags against structs in https://github.com/clbanning/checkxml.
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