bug: Formatter 'oxfmt' error: Error: --stdin-filepath is not expected in this context #865

Neovim version (nvim -v)

NVIM v0.12.0-dev-825+gd4c8e8df1c

Operating system/version

debian12

Read debugging tips

• I have read through the debugging tips.

Add the debug logs

• I have set log_level = vim.log.levels.DEBUG and pasted the log contents below.

Log file

2026-03-31 20:41:13[DEBUG] Running formatters on /home/linux/.config/nvim/test.json: { "oxfmt" }
2026-03-31 20:41:13[INFO] Run oxfmt on /home/linux/.config/nvim/test.json
2026-03-31 20:41:13[DEBUG] Run command: { "/home/linux/anydev/app/x86_64/bin/oxfmt", "--stdin-filepath", "/home/linux/.config/nvim/test.json" }
2026-03-31 20:41:13[DEBUG] Run default CWD: /home/linux/.config/nvim
2026-03-31 20:41:13[INFO] oxfmt exited with code 1
2026-03-31 20:41:13[DEBUG] oxfmt stdout: { "" }
2026-03-31 20:41:13[DEBUG] oxfmt stderr: { "Error: --stdin-filepath is not expected in this context", "" }
2026-03-31 20:41:13[ERROR] Formatter 'oxfmt' error: Error: --stdin-filepath is not expected in this context

Describe the bug

Hi, I got this error with oxfmt, on formatting json file.

My config:

require("conform").setup({
  log_level = vim.log.levels.DEBUG,
  formatters_by_ft = {
    json = { "oxfmt" },
  },
})

conform version: master
oxfmt version: 0.43.0

What is the severity of this bug?

tolerable (can work around it)

Steps To Reproduce

1. Install oxfmt 0.43.0, the latest
2. format a json file.

Expected Behavior

Not failed

Minimal example file

No response

Minimal init.lua

require("conform").setup({
  log_level = vim.log.levels.DEBUG,
  formatters_by_ft = {
    json = { "oxfmt" },
  },
})

Additional context

No response