DioxusLabs/dioxus · error

keyword argument repeated: `encoding`

Error message

keyword argument repeated: `encoding`

What it means

Parse guard in the server-macro attribute parser: the same keyword argument `encoding` appeared more than once in one #[server(...)] attribute list, and the parser rejects duplicate keyword assignments (each may be set only once). The input at fault is the macro invocation's argument list, with the span pointing at the repeated key.

Solutions

1. Remove the duplicate `encoding` keyword argument; each keyword may only be specified once.

When it happens

Trigger: Thrown at packages/fullstack-macro/src/lib.rs:1574 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/079a3530810f7689. Report an issue: GitHub.

Appendix: source

Thrown at packages/fullstack-macro/src/lib.rs:1574

                    if key == "name" {
                        if struct_name.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `name`",
                            ));
                        }
                        struct_name = Some(stream.parse()?);
                    } else if key == "prefix" {
                        if prefix.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `prefix`",
                            ));
                        }
                        prefix = Some(stream.parse()?);
                    } else if key == "encoding" {
                        if encoding.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `encoding`",
                            ));
                        }
                        encoding = Some(stream.parse()?);
                    } else if key == "endpoint" {
                        if fn_path.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `endpoint`",
                            ));
                        }
                        fn_path = Some(stream.parse()?);
                    } else if key == "input" {
                        if encoding.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "`encoding` and `input` should not both be \

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