In ReactJS, adding a null value to a table typically involves rendering a cell with a null or undefined value in the table’s JSX code.

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Example:

import React from ‘react’;
import MaterialTable from ‘material-table’;
function CustomMaterialTable(props) {
  // Preprocess data to replace null or empty values with “NULL”
  const processedData = props.data.map((row) => {
    const processedRow = {};
    for (const key in row) {
      processedRow[key] = row[key] || ‘NULL’;
    }
    return processedRow;
  });
  return (
    <MaterialTable
      {…props} // Pass through any other props you want
      data={processedData}
    />
  );
}
function MyTable() {
  // Your actual data (replace this with your data)
  const data = [
    { column1: null, column2: ‘Value2’, column3: null },
    { column1: ‘Value1’, column2: null, column3: ‘Value3’ },
    // Add more rows as needed
  ];
  const columns = [
    { title: ‘Column 1’, field: ‘column1’ },
    { title: ‘Column 2’, field: ‘column2’ },
    { title: ‘Column 3’, field: ‘column3’ },
  ];
  return (
    <CustomMaterialTable
      columns={columns}
      data={data}
      title=”My Table”
    />
  );
}
export default MyTable;