Awesome

Tagliatelle

A linter that handles struct tags.

Supported string casing:

• camel
• pascal
• kebab
• snake
• upperSnake
• goCamel Respects Go's common initialisms (e.g. HttpResponse -> HTTPResponse).
• goPascal Respects Go's common initialisms (e.g. HttpResponse -> HTTPResponse).
• goKebab Respects Go's common initialisms (e.g. HttpResponse -> HTTPResponse).
• goSnake Respects Go's common initialisms (e.g. HttpResponse -> HTTPResponse).
• header
• upper
• lower

Examples

// json and camel case
type Foo struct {
    ID     string `json:"ID"` // must be "id"
    UserID string `json:"UserID"`// must be "userId"
    Name   string `json:"name"`
    Value  string `json:"val,omitempty"`// must be "value"
}

What this tool is about

This tool is about validating tags according to rules you define. The tool also allows to fix tags according to the rules you defined.

This tool is not intended to validate the fact a tag in valid or not. To do that, you can use go vet, or use golangci-lint "go vet" linter.

How to use the tool

As a golangci-lint linter

Define the rules, you want via your golangci-lint configuration file:

linters-settings:
  tagliatelle:
    # Check the struck tag name case.
    case:
      # Use the struct field name to check the name of the struct tag.
      # Default: false
      use-field-name: true
      rules:
        # Any struct tag type can be used.
        # Support string case: `camel`, `pascal`, `kebab`, `snake`, `upperSnake`, `goCamel`, `goPascal`, `goKebab`, `goSnake`, `upper`, `lower`, `header`.
        json: camel
        yaml: camel
        xml: camel
        toml: camel
        bson: camel
        avro: snake
        mapstructure: kebab
        env: upperSnake
        envconfig: upperSnake

More information here https://golangci-lint.run/usage/linters/#tagliatelle

Install and run it from the binary

Not recommended.

go install github.com/ldez/tagliatelle/cmd/tagliatelle@latest

then launch it manually.

Rules

Here are the default rules for the well known and used tags, when using tagliatelle as a binary or golangci-lint linter:

• json: camel
• yaml: camel
• xml: camel
• bson: camel
• avro: snake
• header: header
• env: upperSnake
• envconfig: upperSnake

Custom Rules

The tool is not limited to the tags used in example, you can use it to validate any tag.

You can add your own tag, for example whatever and tells the tool you want to use kebab.

This option is only available via golangci-lint.

linters-settings:
  tagliatelle:
    # Check the struck tag name case.
    case:
      # Use the struct field name to check the name of the struct tag.
      # Default: false
      use-field-name: true
      rules:
        # Any struct tag type can be used.
        # Support string case: `camel`, `pascal`, `kebab`, `snake`, `goCamel`, `goPascal`, `goKebab`, `goSnake`, `upper`, `lower`
        json: camel
        yaml: camel
        xml: camel
        toml: camel
        whatever: kebab