encoding/json: Marshaling Issue When Struct Tag Starts with Lower Case Letters

[pTpTk]

Go version

go version go1.23.6 linux/amd64

Output of go env in your module/workspace:

GO111MODULE='on'
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/zeyu/.cache/go-build'
GOENV='/home/zeyu/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/zeyu/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/zeyu/go'
GOPRIVATE=''
GOPROXY='https://goproxy.cn,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.23.6'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/zeyu/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/zeyu/Documents/test/v2/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3984750311=/tmp/go-build -gno-record-gcc-switches'

What did you do?

playground example

I had a struct with tag email, and another struct with tag Email. Then I marshaled them.

What did you see happen?

I got an empty raw message with the struct tagged email, but the other struct behaves normally.

What did you expect to see?

Both structs should've marshalled.

[gabyhelp]

Related Issues

• encoding/json Unmarshal function does not work with lowercase struct fields of go type #61335 (closed)
• encoding/json does not unmarshal my struct properly #63161 (closed)
• encoding/json: bug in json.Unmarshal if keys in JSON differ only by case #26687 (closed)
• encoding/json: document behaviour of json.Marshal() with non-pointer elements with MarshalJSON() defined for pointers #68919 (closed)
• Order of tags 'json' and 'gorm' in struct changes marshalling output #49430 (closed)
• UnmarshalJSON returns error because of case sensitive tag fields #30124 (closed)
• encoding/json: Marshal fails when we define struct variables in lower case: go version go1.4. #11926 (closed)
• json.Marshal returns {} for a struct when struct vars start with lowercase #2131 (closed)
• encoding/json: Error in Marshalling Slice of Struct type -> affected/package: json #61710 (closed)

Related Discussions

• need to fix json marshal on lower-cased attributes?

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions