docs.sheetjs.com/docz/docs/06-solutions/03-processing.md

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---
title: Data Processing
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sidebar_position: 3
---
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The ["Common Spreadsheet Format"](/docs/csf/general) is a simple object
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representation of the core concepts of a workbook. The utility functions work
with the object representation and are intended to handle common use cases.
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The [Data Input](/docs/solutions/input) and [Data Output](/docs/solutions/output) sections cover how to
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read from data sources and write to data sources.
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## Workbook
### Worksheets
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:::note pass
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Worksheet names are case-sensitive.
:::
_List the Worksheet names in tab order_
```js
var wsnames = workbook.SheetNames;
```
The `SheetNames` property of the workbook object is a list of the worksheet
names in "tab order". API functions will look at this array.
_Access a Worksheet by name_
```js
var worksheet = workbook.Sheets[sheet_name];
```
The workbook object's `Sheets` property is an object whose keys are sheet names
and whose values are worksheet objects.
_Access the first Worksheet_
```js
var first_ws = workbook.Sheets[workbook.SheetNames[0]];
```
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Combining the previous examples, `workbook.Sheets[workbook.SheetNames[0]]` is
the first worksheet if it exists in the workbook.
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_Replace a Worksheet in place_
```js
workbook.Sheets[sheet_name] = new_worksheet;
```
The `Sheets` property of the workbook object is an object whose keys are names
and whose values are worksheet objects. By reassigning to a property of the
`Sheets` object, the worksheet object can be changed without disrupting the
rest of the worksheet structure.
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_Append a Worksheet to a Workbook_
```js
XLSX.utils.book_append_sheet(workbook, worksheet, sheet_name);
```
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The [`book_append_sheet`](/docs/api/utilities/wb) utility function appends a
worksheet to the workbook.
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_Append a Worksheet to a Workbook and find a unique name_
```js
var new_name = XLSX.utils.book_append_sheet(workbook, worksheet, name, true);
```
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If the fourth argument is `true`, the function will try to find a new worksheet
name in case of a collision.
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#### Examples
```js
var ws_name = "SheetJS";
/* Create worksheet */
var ws_data = [
[ "S", "h", "e", "e", "t", "J", "S" ],
[ 1 , 2 , 3 , 4 , 5 ]
];
var ws = XLSX.utils.aoa_to_sheet(ws_data);
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/* Create workbook */
var wb = XLSX.utils.book_new();
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/* Add the worksheet to the workbook */
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// highlight-next-line
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XLSX.utils.book_append_sheet(wb, ws, ws_name);
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/* Write to file */
XLSX.writeFile(wb, "SheetJS.xlsx");
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```
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### Other Properties
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_Add a Defined Name_
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```js
if(!workbook.Workbook) workbook.Workbook = {};
if(!workbook.Workbook.Names) workbook.Workbook.Names = [];
workbook.Workbook.Names.push({
Name: "SourceData",
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Ref: "Sheet1!$A$1:$D$12"
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});
```
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This is described in more detail in ["Defined Names"](/docs/csf/features/names).
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_Set Workbook Properties_
```js
if(!wb.Props) wb.Props = {};
wb.Props["Company"] = "SheetJS LLC";
```
The full set of property names, and their mapping to the Excel UI, is included
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in ["File Properties"](/docs/csf/book#file-properties)
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## Worksheet
### Cells
_Modify a single cell value in a Worksheet_
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```js
XLSX.utils.sheet_add_aoa(worksheet, [[new_value]], { origin: address });
```
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_Modify multiple cell values in a Worksheet_
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```js
XLSX.utils.sheet_add_aoa(worksheet, aoa, opts);
```
The `sheet_add_aoa` utility function modifies cell values in a worksheet. The
first argument is the worksheet object. The second argument is an array of
arrays of values. The `origin` key of the third argument controls where cells
will be written. The following snippet sets `B3=1` and `E5="abc"`:
```js
XLSX.utils.sheet_add_aoa(worksheet, [
[1], // <-- Write 1 to cell B3
, // <-- Do nothing in row 4
[/*B5*/, /*C5*/, /*D5*/, "abc"] // <-- Write "abc" to cell E5
], { origin: "B3" });
```
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["Array of Arrays Input"](/docs/api/utilities/array#array-of-arrays-input) describes the
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function and the optional `opts` argument in more detail.
#### Examples
The special origin value `-1` instructs `sheet_add_aoa` to start in column A of
the row after the last row in the range, appending the data:
```js
XLSX.utils.sheet_add_aoa(worksheet, [
["first row after data", 1],
["second row after data", 2]
], { origin: -1 });
```
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### Other Properties
_Merge a group of cells_
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**[The exposition has been moved to a separate page.](/docs/csf/features/merges)**