@uekichinos/quire

@uekichinos/quire

A small, dependency-light .xlsx reader + writer for Node and the browser.

• One runtime dependency — fflate for zip packaging
• Write: worksheets · typed cells (string / number / boolean / Date / formula) · a de-duplicated style pool · merged cells · column widths · freeze panes · auto-filter · row heights. Deterministic Uint8Array / Blob output
• Read: values, dates, formulas (+ cached result), merges — via an in-house strict XML tokenizer, not a dependency, so the DOCTYPE / entity-expansion class behind most XML-parser CVEs doesn't apply
• Identical in Node and the browser

Install

npm install @uekichinos/quire

Usage

import { createWorkbook } from '@uekichinos/quire'

const wb = createWorkbook()
const sheet = wb.addWorksheet('Sales')

const header = { font: { bold: true, color: 'FFFFFF' }, fill: '2F5597' }
sheet.addRow(
  [
    { value: 'Product', style: header },
    { value: 'Revenue', style: header },
    { value: 'Updated', style: header },
  ],
)

sheet.addRow(['Widget', { value: 15003.4, style: { numFmt: '#,##0.00' } }, new Date(2024, 2, 1)])
sheet.addRow(['Gadget', { value: 2450, style: { numFmt: '#,##0.00' } }, new Date(2024, 2, 3)])

sheet.addRow(
  ['Total', { value: { formula: 'SUM(B2:B3)', result: 17453.4 } }],
  { style: { font: { bold: true }, border: { top: { style: 'thin' } } } },
)

// layout
sheet.merge('A1:C1')
sheet.setColumn(1, { width: 24 })
sheet.freeze({ ySplit: 1 })
sheet.autoFilter('A1:C1')
sheet.addRow(['tall row'], { height: 30 })
sheet.setCell('E1', 'note', { align: { wrapText: true } })

// …or up front
wb.addWorksheet('Q2', { columns: [{ width: 20 }], freeze: { ySplit: 1 }, autoFilter: 'A1:C1' })

const bytes = wb.xlsx() // Uint8Array

// Node
import { writeFileSync } from 'node:fs'
writeFileSync('sales.xlsx', bytes)

// Browser
const url = URL.createObjectURL(wb.blob())

API

createWorkbook(): Workbook

Workbook
addWorksheet(name, options?)	options: { columns?, freeze?, autoFilter? }. Name: 1–31 chars, unique, no \ / ? * [ ] :
xlsx() → Uint8Array	deterministic
blob() → Blob	spreadsheetml.sheet mime

Worksheet (all chainable)
addRow(values, { style?, height? })	values: CellInput[] — a bare value or { value, style }
setCell(ref, value, style?)	write to any A1 reference
setRow(i, { style?, height? })	style/size a row even with no cells
setColumn(i, { width?, hidden?, style? })	1-based; column style resolves column < row < cell
merge(range)	'A1:C1'; rejects single-cell / backwards / overlapping
freeze({ xSplit?, ySplit? })	frozen panes; freeze({}) clears
autoFilter(range)	header filter dropdowns

Cell values: string · number · boolean · Date · { formula, result? } · null. Dates use the 1900 serial system (default format yyyy-mm-dd). null / undefined cells are skipped but keep column position. Non-finite numbers and pre-1900 dates throw.

CellStyle: font (name, size, bold, italic, underline, color) · fill ('RRGGBB' / 'AARRGGBB') · align (horizontal, vertical, wrapText, indent) · border (top/right/bottom/left/all → { style, color? }) · numFmt (format code or built-in id). Every distinct style is interned once. Cell style merges over row style over column style, one nested level deep.

Run node examples/hello.mjs (after pnpm build) for a full example.

Reading (0.2.0)

import { readWorkbook } from '@uekichinos/quire'

const wb = readWorkbook(bytes)          // Uint8Array | ArrayBuffer

wb.sheetNames                            // ['Sales', …]
const s = wb.sheet('Sales')             // by name or index

s.dimension                              // { rows, cols }
s.merges                                 // ['A1:C1', …]
s.cell('B2')                             // { ref, row, col, type, value, formula? }
s.values()                               // (string|number|boolean|Date|null)[][]

for (const row of s.rows()) {            // sparse: row[col-1]
  console.log(row.map((c) => c?.value))
}

ReadCell.type is 'string' | 'number' | 'boolean' | 'date' | 'formula' | 'error' | 'empty'. Numbers with a date format become Date (opt out with readWorkbook(bytes, { dates: false })). Every cell also carries .numFmt (the resolved format code) when it has one. Formula cells carry both .formula (no leading =) and .value (the cached result). { sheets: [name|index] } loads a subset.

readWorkbookAsync(bytes, options?) returns the same ReadWorkbook but yields to the event loop between sheets, so a large import doesn't block. s.values({ ragged: true }) keeps each row's own length instead of padding to the sheet width.

Limits. readWorkbook(bytes, { limits }) caps maxTotalBytes (100 MB), maxPartBytes (50 MB), maxCells (5 000 000) and maxSheets (256); the archive is inflated part-by-part and aborted mid-stream when a cap trips. Over the limit throws QuireError.

Styles on read — readWorkbook(bytes, { styles: true }) resolves a ReadStyle onto each cell (font, fill, border, align, numFmt), mirror of the writer's CellStyle. rgb colours resolve exactly; indexed colours use the standard palette; theme colours are read from xl/theme (with the 0/1 swap and an approximate tint). Off by default — most imports only need values.

Deliberately strict and small. The XML is parsed by a ~200-line in-house tokenizer (not a dependency) that rejects <!DOCTYPE>, <!ENTITY>, <![CDATA[> and unknown entities outright — the DOCTYPE / entity-expansion class that accounts for most XML-parser CVEs does not apply. Only an allow-list of parts is extracted, with uncompressed-size caps enforced before and after inflation. Still: parse untrusted uploads inside a worker with an overall time/memory limit.

Not read: data validation, conditional formatting, images, charts, pivot tables, hyperlinks, defined names, column/row-level styles. Reading is aimed at files from mainstream tools (Excel, Google Sheets, LibreOffice, openpyxl, exceljs, quire) — not corrupt files or every vendor quirk. See PLAN-READER.md.

Scope

quire is not a drop-in ExcelJS replacement. The writer covers the common "export a styled spreadsheet" case; the reader covers "import the values from a normal .xlsx". Out of scope for both (see PLAN.md and PLAN-READER.md): images, charts, pivot tables, rich text, a streaming mode, .xls / .xlsb.

Performance

In-memory. Writing ~100k rows × 5 cols takes ~1 s; reading is comparable. For millions of rows, chunk across sheets or wait for a streaming mode.

License

MIT © uekichinos. Portions adapted from ExcelJS (MIT) — see NOTICE.