vercel/next.js · error

Unknown style {} for font {}. Available styles: {}

Error message

Unknown style {} for font {}.
Available styles: {}

What it means

Thrown by options_from_request() when a requested style (e.g. 'italic', 'normal') is not in the font's available styles list. The validator iterates requested styles and bails on the first one not found in font_data.styles, printing the valid set.

Source

Thrown at crates/next-core/src/next_font/google/options.rs:155

        let mut weights = vec![];
        for weight in requested_weights {
            weights.push(weight.parse()?);
        }

        FontWeights::Fixed(weights)
    };

    if styles.is_empty() {
        if font_data.styles.len() == 1 {
            styles.push(font_data.styles[0].clone());
        } else {
            styles.push(rcstr!("normal"));
        }
    }

    for requested_style in &styles {
        if !font_data.styles.contains(requested_style) {
            anyhow::bail!(
                "Unknown style {} for font {}.\nAvailable styles: {}",
                requested_style,
                font_family,
                font_data.styles.join(", ")
            )
        }
    }

    let display = argument.display.unwrap_or_else(|| rcstr!("swap"));

    if !ALLOWED_DISPLAY_VALUES.contains(&display.as_str()) {
        anyhow::bail!(
            "Invalid display value {} for font {}.\nAvailable display values: {}",
            display,
            font_family,
            ALLOWED_DISPLAY_VALUES.join(", ")
        )
    }

View on GitHub (pinned to 0ae8c72462)

Solutions

1. Use a style from the 'Available styles' in the error message.
2. Omit the style property to accept the default (the single available style, or 'normal').
3. Switch to a font family that ships the style you need.

Example fix

// before
const font = Archivo({ subsets: ['latin'], style: 'italic' }) // Archivo may lack italic
// after
const font = Archivo({ subsets: ['latin'] })

When it happens

Trigger: Passing `style: 'italic'` to a font that only supports 'normal', or a typo'd/invalid style string.

Common situations: Assuming a font has an italic variant when it doesn't; copy-pasting style from another font; case or spelling mistake.

Related errors

• Only zero or one arguments to font functions are currently s
• Missing weight for {}. Available weights: {}
• Unexpected `variable` in weight array for font {}. You only
• Unknown weight {} for font {}. Available weights: {}
• Invalid display value {} for font {}. Available display valu

AI-assisted analysis of vercel/next.js@0ae8c72462 (2026-08-06). Data as JSON: /api/errors/b3f7af6e7d9d7d50. Report an issue: GitHub.