R version 4.5.0 RC (2025-04-03 r88103 ucrt) -- "How About a Twenty-Six"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> x = "Open Bar $300 \u5564\u9152\u3001\u6C23\u9152 \u4EFB\u98F2"
> print(x)
[1] "Open Bar $300 啤酒、氣酒 任飲"
> Encoding(x)
[1] "UTF-8"
> library(RJSONIO)
> fromJSON(paste('{"tweet":"', x, '"}', sep = ''))
                          tweet 
"Open Bar $300 啤酒、氣酒 任飲" 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.17    0.06    0.17