core

name	core
description	Use TanStack Table v9 as a headless data-grid state and row-processing engine. Load for first-table architecture, stable data and columns, row numbering with getDisplayIndex, semantic rendering, framework adapter choice, or deciding what Table owns versus the renderer.
metadata	{"type":"core","library":"@tanstack/table-core","library_version":"9.0.0-beta.43"}
sources	["TanStack/table:docs/overview.md","TanStack/table:docs/guide/tables.md","TanStack/table:docs/guide/data.md","TanStack/table:docs/guide/rows.md","TanStack/table:packages/table-core/src/index.ts"]

TanStack Table Core

TanStack Table creates a table instance, state, and row models. It does not render a component, choose a component library, apply CSS, or supply interaction accessibility. Use a framework adapter in UI code; use constructTable only for framework-neutral integrations.

Setup

import {
  constructTable,
  createColumnHelper,
  tableFeatures,
} from '@tanstack/table-core'
import { storeReactivityBindings } from '@tanstack/table-core/store-reactivity-bindings'

type Person = { id: string; name: string }
const features = tableFeatures({
  coreReactivityFeature: storeReactivityBindings(),
})
const helper = createColumnHelper<typeof features, Person>()
const columns = helper.columns([helper.accessor('name', { header: 'Name' })])
const data: Person[] = [{ id: '1', name: 'Ada' }]
const table = constructTable({
  features,
  columns,
  data,
  getRowId: (row) => row.id,
})

for (const row of table.getRowModel().rows) {
  console.log(row.getAllCells().map((cell) => cell.getValue()))
}

Core Patterns

Start with core, add only behavior used

const features = tableFeatures({
  coreReactivityFeature: storeReactivityBindings(),
})

The core row model is automatic; filtering, sorting, pagination, and other optional behavior require their feature plugins.

Keep model inputs stable

const data: Person[] = [{ id: '1', name: 'Ada' }]
const columns = helper.columns([helper.accessor('name', { header: 'Name' })])

Define static inputs once and preserve query/store references when data has not changed.

Number rows in current display order

const rowNumberColumn = helper.display({
  id: 'rowNumber',
  header: '#',
  cell: ({ row }) => {
    const displayIndex = row.getDisplayIndex()
    return displayIndex === -1 ? '' : displayIndex + 1
  },
})

row.getDisplayIndex() follows the current filtering, grouping, sorting, and expansion order before pagination. row.index remains the row's creation-time position within its parent array.

Common Mistakes

[HIGH] Expecting Table to render a grid

Wrong:

document.body.append(table as unknown as Node)

Correct:

const names = table
  .getRowModel()
  .rows.map((row) => row.getValue<string>('name'))
document.body.textContent = names.join(', ')

The table instance is a model; markup, CSS, semantics, and accessibility are renderer responsibilities.

Source: docs/overview.md

[HIGH] Recreating model inputs repeatedly

Wrong:

const options = () => ({
  data: source.map((item) => item),
  columns: helper.columns([]),
})

Correct:

const data = source.map((item) => item)
const columns = helper.columns([])
const options = () => ({ data, columns })

New references invalidate memoized row and column work and can create adapter render loops.

Source: docs/guide/data.md

[HIGH] Detaching prototype-bound methods

Wrong:

const { getValue } = table.getRowModel().rows[0]!
getValue('name')

Correct:

const row = table.getRowModel().rows[0]!
row.getValue('name')

V9 row, cell, column, and header methods use their instance as this.

Source: docs/framework/react/guide/migrating.md#instance-methods-must-be-called-on-their-instance

[HIGH] Reading the display-index cache directly

Wrong:

const rowNumber = row._displayIndexCache + 1

Correct:

const displayIndex = row.getDisplayIndex()
const rowNumber = displayIndex === -1 ? undefined : displayIndex + 1

_displayIndexCache is internal and may be stale until display order is recomputed. The public method refreshes display order, validates that the cached slot still contains the row, and returns -1 when it does not.

Source: docs/guide/rows.md#row-numbers-and-display-indexes, packages/table-core/src/core/rows/coreRowsFeature.utils.ts

API Discovery

Inspect node_modules/@tanstack/table-core/src/index.ts, then follow the exported implementation. For UI creation and rendering, inspect node_modules/@tanstack/<framework>-table/src/index.ts and load that adapter's getting-started skill.