props.propName in the setup() function, this.propName outside the setup function, or simply propName in the template.nuxt.config.ts file. The Nuxt documentation on custom routing provides examples of how to properly configure routes.nuxt.config.ts file. The Stack Overflow post about dynamic routing with i18n shows an example of how to set up i18n with custom routes.nuxt.config.ts file. This would allow for a more precise diagnosis of the problem.props.propNamesetup()this.propNamepropName