Sheet Management

Create, delete, rename, copy, and navigate sheets.

Rust

let mut wb = Workbook::new();

// Create a new sheet (returns 0-based index)
let idx: usize = wb.new_sheet("Sales")?;

// Delete a sheet by name
wb.delete_sheet("Sales")?;

// Rename a sheet
wb.set_sheet_name("Sheet1", "Main")?;

// Copy a sheet (returns new sheet's 0-based index)
let idx: usize = wb.copy_sheet("Main", "Main_Copy")?;

// Get the index of a sheet (None if not found)
let idx: Option<usize> = wb.get_sheet_index("Main");

// Get/set the active sheet
let active: &str = wb.get_active_sheet();
wb.set_active_sheet("Main")?;

TypeScript

const wb = new Workbook();

// Create a new sheet (returns 0-based index)
const idx: number = wb.newSheet('Sales');

// Delete a sheet
wb.deleteSheet('Sales');

// Rename a sheet
wb.setSheetName('Sheet1', 'Main');

// Copy a sheet (returns new sheet's 0-based index)
const copyIdx: number = wb.copySheet('Main', 'Main_Copy');

// Get the index of a sheet (null if not found)
const sheetIdx: number | null = wb.getSheetIndex('Main');

// Get/set the active sheet
const active: string = wb.getActiveSheet();
wb.setActiveSheet('Main');

---

Row and Column Operations

Insert, delete, and configure rows and columns.

Rust

let mut wb = Workbook::new();

// -- Rows (1-based row numbers) --

// Insert 3 empty rows starting at row 2
wb.insert_rows("Sheet1", 2, 3)?;

// Remove row 5
wb.remove_row("Sheet1", 5)?;

// Duplicate row 1 (inserts copy below)
wb.duplicate_row("Sheet1", 1)?;

// Set/get row height
wb.set_row_height("Sheet1", 1, 25.0)?;
let height: Option<f64> = wb.get_row_height("Sheet1", 1)?;

// Show/hide a row
wb.set_row_visible("Sheet1", 3, false)?;

// -- Columns (letter-based, e.g., "A", "B", "AA") --

// Set/get column width
wb.set_col_width("Sheet1", "A", 20.0)?;
let width: Option<f64> = wb.get_col_width("Sheet1", "A")?;

// Show/hide a column
wb.set_col_visible("Sheet1", "B", false)?;

// Insert 2 empty columns starting at column "C"
wb.insert_cols("Sheet1", "C", 2)?;

// Remove column "D"
wb.remove_col("Sheet1", "D")?;

TypeScript

const wb = new Workbook();

// -- Rows (1-based row numbers) --
wb.insertRows('Sheet1', 2, 3);
wb.removeRow('Sheet1', 5);
wb.duplicateRow('Sheet1', 1);
wb.setRowHeight('Sheet1', 1, 25);
const height: number | null = wb.getRowHeight('Sheet1', 1);
wb.setRowVisible('Sheet1', 3, false);

// -- Columns (letter-based) --
wb.setColWidth('Sheet1', 'A', 20);
const width: number | null = wb.getColWidth('Sheet1', 'A');
wb.setColVisible('Sheet1', 'B', false);
wb.insertCols('Sheet1', 'C', 2);
wb.removeCol('Sheet1', 'D');

---

Row/Column Iterators

Read all populated rows or columns from a sheet. Empty rows and columns are omitted.

Rust

let mut wb = Workbook::open("data.xlsx")?;

let rows = wb.get_rows("Sheet1")?;
for (row_num, cells) in &rows {
    for (col_name, value) in cells {
        println!("Row {row_num}, Col {col_name}: {value}");
    }
}

let cols = wb.get_cols("Sheet1")?;

TypeScript

const rows = wb.getRows('Sheet1');
for (const row of rows) {
    for (const cell of row.cells) {
        console.log(`${cell.column}${row.row}: ${cell.value}`);
    }
}

const cols = wb.getCols('Sheet1');

---

Row/Column Outline Levels and Styles

Group rows or columns into collapsible outline levels (0-7), and apply styles to entire rows or columns.

Rust

let mut wb = Workbook::new();

// Outline levels
wb.set_row_outline_level("Sheet1", 3, 1)?;
let level: u8 = wb.get_row_outline_level("Sheet1", 3)?;

wb.set_col_outline_level("Sheet1", "B", 2)?;
let col_level: u8 = wb.get_col_outline_level("Sheet1", "B")?;

// Row/column styles
let style_id = wb.add_style(&style)?;
wb.set_row_style("Sheet1", 1, style_id)?;
let current: u32 = wb.get_row_style("Sheet1", 1)?;

wb.set_col_style("Sheet1", "A", style_id)?;
let col_style: u32 = wb.get_col_style("Sheet1", "A")?;

TypeScript

const wb = new Workbook();

// Outline levels
wb.setRowOutlineLevel('Sheet1', 3, 1);
const level: number = wb.getRowOutlineLevel('Sheet1', 3);

wb.setColOutlineLevel('Sheet1', 'B', 2);
const colLevel: number = wb.getColOutlineLevel('Sheet1', 'B');

// Row/column styles
const styleId = wb.addStyle({ font: { bold: true } });
wb.setRowStyle('Sheet1', 1, styleId);
const current: number = wb.getRowStyle('Sheet1', 1);

wb.setColStyle('Sheet1', 'A', styleId);
const colStyle: number = wb.getColStyle('Sheet1', 'A');

---

Styles

Styles control the visual presentation of cells. Register a style definition to get a style ID, then apply that ID to cells. Identical style definitions are deduplicated automatically.

A Style can include any combination of: font, fill, border, alignment, number format, and protection.

Rust

use sheetkit::{
    AlignmentStyle, BorderLineStyle, BorderSideStyle, BorderStyle,
    FillStyle, FontStyle, HorizontalAlign, PatternType, Style,
    StyleColor, VerticalAlign, Workbook,
};

let mut wb = Workbook::new();

// Register a style
let style_id = wb.add_style(&Style {
    font: Some(FontStyle {
        name: Some("Arial".into()),
        size: Some(14.0),
        bold: true,
        italic: false,
        underline: false,
        strikethrough: false,
        color: Some(StyleColor::Rgb("#FFFFFF".into())),
    }),
    fill: Some(FillStyle {
        pattern: PatternType::Solid,
        fg_color: Some(StyleColor::Rgb("#4472C4".into())),
        bg_color: None,
    }),
    border: Some(BorderStyle {
        bottom: Some(BorderSideStyle {
            style: BorderLineStyle::Thin,
            color: Some(StyleColor::Rgb("#000000".into())),
        }),
        ..Default::default()
    }),
    alignment: Some(AlignmentStyle {
        horizontal: Some(HorizontalAlign::Center),
        vertical: Some(VerticalAlign::Center),
        wrap_text: true,
        ..Default::default()
    }),
    ..Default::default()
})?;

// Apply the style to a cell
wb.set_cell_style("Sheet1", "A1", style_id)?;

// Read the style ID of a cell (None if default)
let current_style: Option<u32> = wb.get_cell_style("Sheet1", "A1")?;

TypeScript

// Register a style
const styleId = wb.addStyle({
    font: {
        name: 'Arial',
        size: 14,
        bold: true,
        color: '#FFFFFF',
    },
    fill: {
        pattern: 'solid',
        fgColor: '#4472C4',
    },
    border: {
        bottom: { style: 'thin', color: '#000000' },
    },
    alignment: {
        horizontal: 'center',
        vertical: 'center',
        wrapText: true,
    },
});

// Apply the style to a cell
wb.setCellStyle('Sheet1', 'A1', styleId);

// Read the style ID of a cell (null if default)
const currentStyle: number | null = wb.getCellStyle('Sheet1', 'A1');

Style Components Reference

FontStyle

Field	Rust Type	TS Type	Description
name	Option<String>	string?	Font family (e.g., "Calibri")
size	Option<f64>	number?	Font size in points
bold	bool	boolean?	Bold text
italic	bool	boolean?	Italic text
underline	bool	boolean?	Underline text
strikethrough	bool	boolean?	Strikethrough text
color	Option<StyleColor>	string?	Font color (hex string in TS)

FillStyle

Field	Rust Type	TS Type	Description
pattern	PatternType	string?	Pattern type (see values below)
fg_color	Option<StyleColor>	string?	Foreground color
bg_color	Option<StyleColor>	string?	Background color

PatternType values: None, Solid, Gray125, DarkGray, MediumGray, LightGray. In TypeScript, use lowercase strings: "none", "solid", "gray125", "darkGray", "mediumGray", "lightGray".

BorderStyle

Each side (left, right, top, bottom, diagonal) accepts a BorderSideStyle with:

• style: one of Thin, Medium, Thick, Dashed, Dotted, Double, Hair, MediumDashed, DashDot, MediumDashDot, DashDotDot, MediumDashDotDot, SlantDashDot
• color: optional color

In TypeScript, use lowercase strings for border style: "thin", "medium", "thick", etc.

AlignmentStyle

Field	Rust Type	TS Type	Description
horizontal	Option<HorizontalAlign>	string?	Horizontal alignment
vertical	Option<VerticalAlign>	string?	Vertical alignment
wrap_text	bool	boolean?	Wrap text
text_rotation	Option<u32>	number?	Text rotation in degrees
indent	Option<u32>	number?	Indentation level
shrink_to_fit	bool	boolean?	Shrink text to fit cell

HorizontalAlign values: General, Left, Center, Right, Fill, Justify, CenterContinuous, Distributed. VerticalAlign values: Top, Center, Bottom, Justify, Distributed.

NumFmtStyle (Rust only)

use sheetkit::style::NumFmtStyle;

// Built-in format (e.g., percent, date, currency)
NumFmtStyle::Builtin(9)  // 0%

// Custom format string
NumFmtStyle::Custom("#,##0.00".to_string())

In TypeScript, use numFmtId (built-in format ID) or customNumFmt (custom format string) on the style object.

ProtectionStyle

Field	Rust Type	TS Type	Description
locked	bool	boolean?	Lock the cell (default: true)
hidden	bool	boolean?	Hide formulas in protected view

---

Charts

Add charts to worksheets. Charts are anchored between two cells (top-left and bottom-right) and render data from specified cell ranges.

Supported Chart Types (43 types)

Column charts:

Rust Variant	TS String	Description
ChartType::Col	"col"	Clustered column
ChartType::ColStacked	"colStacked"	Stacked column
ChartType::ColPercentStacked	"colPercentStacked"	100% stacked column
ChartType::Col3D	"col3D"	3D clustered column
ChartType::Col3DStacked	"col3DStacked"	3D stacked column
ChartType::Col3DPercentStacked	"col3DPercentStacked"	3D 100% stacked column

Bar charts:

Rust Variant	TS String	Description
ChartType::Bar	"bar"	Clustered bar
ChartType::BarStacked	"barStacked"	Stacked bar
ChartType::BarPercentStacked	"barPercentStacked"	100% stacked bar
ChartType::Bar3D	"bar3D"	3D clustered bar
ChartType::Bar3DStacked	"bar3DStacked"	3D stacked bar
ChartType::Bar3DPercentStacked	"bar3DPercentStacked"	3D 100% stacked bar

Line charts:

Rust Variant	TS String	Description
ChartType::Line	"line"	Line
ChartType::LineStacked	"lineStacked"	Stacked line
ChartType::LinePercentStacked	"linePercentStacked"	100% stacked line
ChartType::Line3D	"line3D"	3D line

Pie charts:

Rust Variant	TS String	Description
ChartType::Pie	"pie"	Pie
ChartType::Pie3D	"pie3D"	3D pie
ChartType::Doughnut	"doughnut"	Doughnut

Area charts:

Rust Variant	TS String	Description
ChartType::Area	"area"	Area
ChartType::AreaStacked	"areaStacked"	Stacked area
ChartType::AreaPercentStacked	"areaPercentStacked"	100% stacked area
ChartType::Area3D	"area3D"	3D area
ChartType::Area3DStacked	"area3DStacked"	3D stacked area
ChartType::Area3DPercentStacked	"area3DPercentStacked"	3D 100% stacked area

Scatter charts:

Rust Variant	TS String	Description
ChartType::Scatter	"scatter"	Scatter (markers only)
ChartType::ScatterSmooth	"scatterSmooth"	Scatter with smooth lines
ChartType::ScatterLine	"scatterLine"	Scatter with straight lines

Radar charts:

Rust Variant	TS String	Description
ChartType::Radar	"radar"	Radar
ChartType::RadarFilled	"radarFilled"	Filled radar
ChartType::RadarMarker	"radarMarker"	Radar with markers

Stock charts:

Rust Variant	TS String	Description
ChartType::StockHLC	"stockHLC"	High-Low-Close
ChartType::StockOHLC	"stockOHLC"	Open-High-Low-Close
ChartType::StockVHLC	"stockVHLC"	Volume-High-Low-Close
ChartType::StockVOHLC	"stockVOHLC"	Volume-Open-High-Low-Close

Surface charts:

Rust Variant	TS String	Description
ChartType::Surface	"surface"	3D surface
ChartType::Surface3D	"surface3D"	3D surface (top view)
ChartType::SurfaceWireframe	"surfaceWireframe"	Wireframe surface
ChartType::SurfaceWireframe3D	"surfaceWireframe3D"	Wireframe surface (top view)

Other charts:

Rust Variant	TS String	Description
ChartType::Bubble	"bubble"	Bubble

Combo charts:

Rust Variant	TS String	Description
ChartType::ColLine	"colLine"	Column + line combo
ChartType::ColLineStacked	"colLineStacked"	Stacked column + line
ChartType::ColLinePercentStacked	"colLinePercentStacked"	100% stacked column + line

Rust

use sheetkit::{ChartConfig, ChartSeries, ChartType, Workbook};

let mut wb = Workbook::new();

// Populate data first...
wb.set_cell_value("Sheet1", "A1", CellValue::String("Q1".into()))?;
wb.set_cell_value("Sheet1", "B1", CellValue::Number(1500.0))?;
// ... more data rows ...

// Add a chart anchored from D1 to K15
wb.add_chart(
    "Sheet1",
    "D1",   // top-left anchor cell
    "K15",  // bottom-right anchor cell
    &ChartConfig {
        chart_type: ChartType::Col,
        title: Some("Quarterly Revenue".into()),
        series: vec![ChartSeries {
            name: "Revenue".into(),
            categories: "Sheet1!$A$1:$A$4".into(),
            values: "Sheet1!$B$1:$B$4".into(),
        }],
        show_legend: true,
    },
)?;

TypeScript

wb.addChart('Sheet1', 'D1', 'K15', {
    chartType: 'col',
    title: 'Quarterly Revenue',
    series: [
        {
            name: 'Revenue',
            categories: 'Sheet1!$A$1:$A$4',
            values: 'Sheet1!$B$1:$B$4',
        },
    ],
    showLegend: true,
});

---

Images

Embed images into worksheets. Supports 11 formats: PNG, JPEG, GIF, BMP, ICO, TIFF, SVG, EMF, EMZ, WMF, WMZ. Images are anchored to a cell and sized by pixel dimensions.

Rust

use sheetkit::{ImageConfig, ImageFormat, Workbook};

let mut wb = Workbook::new();

let image_bytes = std::fs::read("logo.png").unwrap();

wb.add_image(
    "Sheet1",
    &ImageConfig {
        data: image_bytes,
        format: ImageFormat::Png,
        from_cell: "B2".into(),
        width_px: 200,
        height_px: 100,
    },
)?;

TypeScript

import { readFileSync } from 'fs';

const imageData = readFileSync('logo.png');

wb.addImage('Sheet1', {
    data: imageData,
    format: 'png',        // "png" | "jpeg" | "jpg" | "gif" | "bmp" | "ico" | "tiff" | "tif" | "svg" | "emf" | "emz" | "wmf" | "wmz"
    fromCell: 'B2',
    widthPx: 200,
    heightPx: 100,
});

---

Data Validation

Add data validation rules to cell ranges to restrict what values users can enter.

Validation Types

Rust Variant	TS String	Description
ValidationType::None	"none"	No constraint (prompt/message only)
ValidationType::Whole	"whole"	Whole number constraint
ValidationType::Decimal	"decimal"	Decimal number constraint
ValidationType::List	"list"	Dropdown list
ValidationType::Date	"date"	Date constraint
ValidationType::Time	"time"	Time constraint
ValidationType::TextLength	"textLength"	Text length constraint
ValidationType::Custom	"custom"	Custom formula constraint

Operators

Between, NotBetween, Equal, NotEqual, LessThan, LessThanOrEqual, GreaterThan, GreaterThanOrEqual.

In TypeScript, input is case-insensitive; output uses camelCase: "between", "notBetween", "lessThan", etc.

The sqref must be a valid cell range reference. For types other than none, formula1 is required. For between/notBetween operators, formula2 is also required.

Error Styles

Stop, Warning, Information -- controls the severity of the error dialog shown when invalid data is entered.

Rust

use sheetkit::{DataValidationConfig, ErrorStyle, ValidationType, Workbook};

let mut wb = Workbook::new();

// Dropdown list validation
wb.add_data_validation(
    "Sheet1",
    &DataValidationConfig {
        sqref: "C2:C100".into(),
        validation_type: ValidationType::List,
        operator: None,
        formula1: Some("\"Achieved,Not Achieved,In Progress\"".into()),
        formula2: None,
        allow_blank: true,
        show_input_message: true,
        prompt_title: Some("Select Status".into()),
        prompt_message: Some("Choose from the dropdown".into()),
        show_error_message: true,
        error_style: Some(ErrorStyle::Stop),
        error_title: Some("Invalid".into()),
        error_message: Some("Please select from the list".into()),
    },
)?;

// Get all validations on a sheet
let validations = wb.get_data_validations("Sheet1")?;

// Remove a validation by cell range reference
wb.remove_data_validation("Sheet1", "C2:C100")?;

TypeScript

// Dropdown list validation
wb.addDataValidation('Sheet1', {
    sqref: 'C2:C100',
    validationType: 'list',
    formula1: '"Achieved,Not Achieved,In Progress"',
    allowBlank: true,
    showInputMessage: true,
    promptTitle: 'Select Status',
    promptMessage: 'Choose from the dropdown',
    showErrorMessage: true,
    errorStyle: 'stop',
    errorTitle: 'Invalid',
    errorMessage: 'Please select from the list',
});

// Get all validations on a sheet
const validations = wb.getDataValidations('Sheet1');

// Remove a validation by cell range reference
wb.removeDataValidation('Sheet1', 'C2:C100');

---

Merge Cells

Merge a rectangular range of cells into a single visual cell. The value of the top-left cell is displayed across the merged area.

Rust

let mut wb = Workbook::new();

wb.set_cell_value("Sheet1", "A1", CellValue::from("Report Header"))?;
wb.merge_cells("Sheet1", "A1", "C1")?;

let merged = wb.get_merge_cells("Sheet1")?;

wb.unmerge_cell("Sheet1", "A1:C1")?;

TypeScript

const wb = new Workbook();

wb.setCellValue('Sheet1', 'A1', 'Report Header');
wb.mergeCells('Sheet1', 'A1', 'C1');

const merged: string[] = wb.getMergeCells('Sheet1');

wb.unmergeCell('Sheet1', 'A1:C1');

---

Hyperlinks

Attach hyperlinks to cells. Three types are supported: external URLs, internal sheet references, and email addresses.

Rust

use sheetkit::hyperlink::HyperlinkType;

let mut wb = Workbook::new();

// External URL
wb.set_cell_hyperlink("Sheet1", "A1",
    HyperlinkType::External("https://example.com".into()),
    Some("Example"), Some("Click to visit"))?;

// Internal sheet reference
wb.set_cell_hyperlink("Sheet1", "A2",
    HyperlinkType::Internal("Sheet2!A1".into()), None, None)?;

// Email
wb.set_cell_hyperlink("Sheet1", "A3",
    HyperlinkType::Email("mailto:user@example.com".into()),
    None, None)?;

// Read and delete
let info = wb.get_cell_hyperlink("Sheet1", "A1")?;
wb.delete_cell_hyperlink("Sheet1", "A1")?;

TypeScript

// External URL
wb.setCellHyperlink('Sheet1', 'A1', {
    linkType: 'external',
    target: 'https://example.com',
    display: 'Example',
    tooltip: 'Click to visit',
});

// Internal sheet reference
wb.setCellHyperlink('Sheet1', 'A2', {
    linkType: 'internal',
    target: 'Sheet2!A1',
});

// Email
wb.setCellHyperlink('Sheet1', 'A3', {
    linkType: 'email',
    target: 'mailto:user@example.com',
});

// Read and delete
const info = wb.getCellHyperlink('Sheet1', 'A1');
wb.deleteCellHyperlink('Sheet1', 'A1');

---

Conditional Formatting

Change cell appearance based on rules applied to their values. Supports 17 rule types including cell value comparisons, color scales, data bars, and text matching.

Rust

use sheetkit::conditional::*;
use sheetkit::style::*;

let mut wb = Workbook::new();

// Highlight cells greater than 100
let rules = vec![ConditionalFormatRule {
    rule_type: ConditionalFormatType::CellIs {
        operator: CfOperator::GreaterThan,
        formula: "100".to_string(),
        formula2: None,
    },
    format: Some(ConditionalStyle {
        font: Some(FontStyle {
            color: Some(StyleColor::Rgb("#FF0000".into())),
            ..Default::default()
        }),
        fill: Some(FillStyle {
            pattern: PatternType::Solid,
            fg_color: Some(StyleColor::Rgb("#FFCCCC".into())),
            bg_color: None,
        }),
        border: None,
        num_fmt: None,
    }),
    priority: Some(1),
    stop_if_true: false,
}];
wb.set_conditional_format("Sheet1", "A1:A100", &rules)?;

let formats = wb.get_conditional_formats("Sheet1")?;
wb.delete_conditional_format("Sheet1", "A1:A100")?;

TypeScript

// Highlight cells greater than 100
wb.setConditionalFormat('Sheet1', 'A1:A100', [{
    ruleType: 'cellIs',
    operator: 'greaterThan',
    formula: '100',
    format: {
        font: { color: '#FF0000' },
        fill: { pattern: 'solid', fgColor: '#FFCCCC' },
    },
    priority: 1,
}]);

// Color scale (green to red)
wb.setConditionalFormat('Sheet1', 'B2:B50', [{
    ruleType: 'colorScale',
    minType: 'min',
    minColor: '#63BE7B',
    maxType: 'max',
    maxColor: '#F8696B',
}]);

// Data bar
wb.setConditionalFormat('Sheet1', 'C2:C50', [{
    ruleType: 'dataBar',
    barColor: '#638EC6',
    showValue: true,
}]);

const formats = wb.getConditionalFormats('Sheet1');
wb.deleteConditionalFormat('Sheet1', 'A1:A100');

---

Tables

Tables are structured data ranges with column headers, styling, and optional auto-filter. Tables are stored as separate OOXML parts and support full round-trip through save and open.

Rust

use sheetkit::table::{TableConfig, TableColumn};

let mut wb = Workbook::new();

// Create a table
let config = TableConfig {
    name: "EmployeeList".to_string(),
    display_name: "EmployeeList".to_string(),
    range: "A1:C5".to_string(),
    columns: vec![
        TableColumn { name: "Name".to_string(), totals_row_function: None, totals_row_label: None },
        TableColumn { name: "Department".to_string(), totals_row_function: None, totals_row_label: None },
        TableColumn { name: "Salary".to_string(), totals_row_function: None, totals_row_label: None },
    ],
    style_name: Some("TableStyleMedium2".to_string()),
    ..TableConfig::default()
};
wb.add_table("Sheet1", &config)?;

// List tables
let tables = wb.get_tables("Sheet1")?;

// Delete a table
wb.delete_table("Sheet1", "EmployeeList")?;

TypeScript

const wb = new Workbook();

// Create a table
wb.addTable("Sheet1", {
    name: "EmployeeList",
    displayName: "EmployeeList",
    range: "A1:C5",
    columns: [
        { name: "Name" },
        { name: "Department" },
        { name: "Salary" },
    ],
    styleName: "TableStyleMedium2",
});

// List tables
const tables = wb.getTables("Sheet1");

// Delete a table
wb.deleteTable("Sheet1", "EmployeeList");

For full API details including all config fields, see the API Reference.

---

Data Conversion Utilities (Node.js only)

SheetKit provides convenience methods for converting between sheet data and common formats like JSON, CSV, and HTML. These are available only in the TypeScript/Node.js bindings.

JSON conversion

import { Workbook } from '@sheetkit/node';

// Read sheet as array of objects
const wb = await Workbook.open("data.xlsx");
const records = wb.toJSON("Sheet1");
// [{ Name: "Alice", Age: 30 }, { Name: "Bob", Age: 25 }, ...]

// Write objects to a sheet
const wb2 = new Workbook();
wb2.fromJSON("Sheet1", [
    { Name: "Alice", Age: 30, City: "Seoul" },
    { Name: "Bob", Age: 25, City: "Busan" },
]);
await wb2.save("output.xlsx");

CSV export

const csv = wb.toCSV("Sheet1");
// "Name,Age,City\nAlice,30,Seoul\n..."

// Tab-separated values
const tsv = wb.toCSV("Sheet1", { separator: "\t" });

HTML export

const html = wb.toHTML("Sheet1");
// "<table><thead><tr><th>Name</th>..."

const html2 = wb.toHTML("Sheet1", { tableClass: "data-table" });

For full API details including all options, see the API Reference.

---

Freeze/Split Panes