jdx/mise · error

--stdin reads the value from stdin; do not provide a value…

Error message

--stdin reads the value from stdin; do not provide a value with KEY=VALUE syntax

What it means

When --stdin is used, the value must come exclusively from standard input. If the user also supplies KEY=VALUE syntax, the value field is already populated, which is contradictory, so mise bails before reading stdin.

Solutions

1. Drop the =value part: `echo value | mise set --stdin KEY`
2. Drop --stdin if you want the inline value: `mise set KEY=value`

Example fix

// before
mise set --stdin API_KEY=abc123   # error
// after
mise set API_KEY=abc123   # or: echo abc123 | mise set --stdin API_KEY

[[ "$1" != *=* ]] || { echo 'with --stdin pass only KEY, not KEY=VALUE'; exit 1; }

When it happens

Trigger: `mise set --stdin KEY=value` — providing an inline value together with the --stdin flag.

Common situations: Copy-pasting a normal `mise set KEY=value` command and appending --stdin; scripted commands mixing both forms.

Understand the failure class

Background: "mutually exclusive" flag errors: what "can't supply both nx and xx", "--raw is not compatible with -i" and "cannot be used with" mean, and how to fix them — this error's family across 29 libraries.

Related errors

• --stdin requires exactly one environment variable key
• Environment variable
• failed to open the editor
• has no value
• not connected: stdin ended before an answer; choose --sync…

AI-assisted analysis of jdx/mise@533346cc37 (2026-09-17). Data as JSON: /api/errors/e57857cd4e7455ac. Report an issue: GitHub.

Appendix: source

Thrown at src/cli/set.rs:192

                    if ev.value.is_none() {
                        let prompt_msg = format!("Enter value for {}", ev.key);
                        let value = Input::new(&prompt_msg)
                            .password(self.age_encrypt) // Mask input if encrypting
                            .theme(&theme)
                            .run()?;
                        ev.value = Some(value);
                    }
                }
            }

            // Read value from stdin if requested
            if self.stdin {
                if env_vars.len() != 1 {
                    bail!("--stdin requires exactly one environment variable key");
                }
                let ev = &mut env_vars[0];
                if ev.value.is_some() {
                    bail!(
                        "--stdin reads the value from stdin; do not provide a value with KEY=VALUE syntax"
                    );
                }
                let mut value = String::new();
                std::io::stdin().read_to_string(&mut value)?;
                // Strip a single trailing newline (matches `gh secret set` behavior)
                if value.ends_with("\r\n") {
                    value.truncate(value.len() - 2);
                } else if value.ends_with('\n') {
                    value.truncate(value.len() - 1);
                }
                ev.value = Some(value);
            }

            // Handle age encryption if requested
            if self.age_encrypt {
                Settings::get().ensure_experimental("age encryption")?;
                // Collect recipients once before the loop to avoid repeated I/O

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