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Google Spreadsheet JSON Export

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exportjson.js
JavaScript
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// Includes functions for exporting active sheet or all sheets as JSON object (also Python object syntax compatible).
// Tweak the makePrettyJSON_ function to customize what kind of JSON to export.
 
function exportAllSheets() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheets = ss.getSheets();
var sheetsData = {};
for (var i = 0; i < sheets.length; i++) {
var sheet = sheets[i];
var rowsData = getRowsData_(sheet);
var sheetName = sheet.getName();
sheetsData[sheetName] = rowsData;
}
var json = makePrettyJSON_(sheetsData);
displayText_(json);
}
 
function exportSheet() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getActiveSheet();
var rowsData = getRowsData_(sheet);
var json = makePrettyJSON_(rowsData);
displayText_(json);
}
 
// Can either output fully indented JSON, newlined JSON, or single-line JSON
var JSON_STYLE = 'indented';
function makePrettyJSON_(object) {
if (JSON_STYLE == 'indented') {
return JSON.stringify(object, null, 4);
} else if (JSON_STYLE == 'newlines') {
var jsonString = Utilities.jsonStringify(object);
var prettyJSON = jsonString.replace(/},/gi, '},\n');
prettyJSON = prettyJSON.replace(/":\[{"/gi, '":\n[{"');
prettyJSON = prettyJSON.replace(/}\],/gi, '}],\n');
return prettyJSON;
} else {
return Utilities.jsonStringify(object);
}
}
 
function displayText_(text) {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var app = UiApp.createApplication().setTitle('Results');;
var scrollPanel = app.createScrollPanel();
var textArea = app.createTextArea().setText(text).setWidth('100%').setHeight('100%');
scrollPanel.add(textArea);
app.add(scrollPanel);
ss.show(app);
}
 
// getRowsData iterates row by row in the input range and returns an array of objects.
// Each object contains all the data for a given row, indexed by its normalized column name.
// Arguments:
// - sheet: the sheet object that contains the data to be processed
// - range: the exact range of cells where the data is stored
// - columnHeadersRowIndex: specifies the row number where the column names are stored.
// This argument is optional and it defaults to the row immediately above range;
// Returns an Array of objects.
function getRowsData_(sheet) {
var headersRange = sheet.getRange(1, 1, sheet.getFrozenRows(), sheet.getMaxColumns());
var headers = headersRange.getValues()[0];
var dataRange = sheet.getRange(sheet.getFrozenRows()+1, 1, sheet.getMaxRows(), sheet.getMaxColumns());
return getObjects_(dataRange.getValues(), normalizeHeaders_(headers));
}
 
// getColumnsData iterates column by column in the input range and returns an array of objects.
// Each object contains all the data for a given column, indexed by its normalized row name.
// Arguments:
// - sheet: the sheet object that contains the data to be processed
// - range: the exact range of cells where the data is stored
// - rowHeadersColumnIndex: specifies the column number where the row names are stored.
// This argument is optional and it defaults to the column immediately left of the range;
// Returns an Array of objects.
function getColumnsData_(sheet, range, rowHeadersColumnIndex) {
rowHeadersColumnIndex = rowHeadersColumnIndex || range.getColumnIndex() - 1;
var headersTmp = sheet.getRange(range.getRow(), rowHeadersColumnIndex, range.getNumRows(), 1).getValues();
var headers = normalizeHeaders_(arrayTranspose_(headersTmp)[0]);
return getObjects(arrayTranspose_(range.getValues()), headers);
}
 
 
// For every row of data in data, generates an object that contains the data. Names of
// object fields are defined in keys.
// Arguments:
// - data: JavaScript 2d array
// - keys: Array of Strings that define the property names for the objects to create
function getObjects_(data, keys) {
var objects = [];
for (var i = 0; i < data.length; ++i) {
var object = {};
var hasData = false;
for (var j = 0; j < data[i].length; ++j) {
var cellData = data[i][j];
if (isCellEmpty_(cellData)) {
continue;
}
object[keys[j]] = cellData;
hasData = true;
}
if (hasData) {
objects.push(object);
}
}
return objects;
}
 
// Returns an Array of normalized Strings.
// Arguments:
// - headers: Array of Strings to normalize
function normalizeHeaders_(headers) {
var keys = [];
for (var i = 0; i < headers.length; ++i) {
var key = normalizeHeader_(headers[i]);
if (key.length > 0) {
keys.push(key);
}
}
return keys;
}
 
// Normalizes a string, by removing all alphanumeric characters and using mixed case
// to separate words. The output will always start with a lower case letter.
// This function is designed to produce JavaScript object property names.
// Arguments:
// - header: string to normalize
// Examples:
// "First Name" -> "firstName"
// "Market Cap (millions) -> "marketCapMillions
// "1 number at the beginning is ignored" -> "numberAtTheBeginningIsIgnored"
function normalizeHeader_(header) {
var key = "";
var upperCase = false;
for (var i = 0; i < header.length; ++i) {
var letter = header[i];
if (letter == " " && key.length > 0) {
upperCase = true;
continue;
}
if (!isAlnum_(letter)) {
continue;
}
if (key.length == 0 && isDigit_(letter)) {
continue; // first character must be a letter
}
if (upperCase) {
upperCase = false;
key += letter.toUpperCase();
} else {
key += letter.toLowerCase();
}
}
return key;
}
 
// Returns true if the cell where cellData was read from is empty.
// Arguments:
// - cellData: string
function isCellEmpty_(cellData) {
return typeof(cellData) == "string" && cellData == "";
}
 
// Returns true if the character char is alphabetical, false otherwise.
function isAlnum_(char) {
return char >= 'A' && char <= 'Z' ||
char >= 'a' && char <= 'z' ||
isDigit(char);
}
 
// Returns true if the character char is a digit, false otherwise.
function isDigit_(char) {
return char >= '0' && char <= '9';
}
 
// Given a JavaScript 2d Array, this function returns the transposed table.
// Arguments:
// - data: JavaScript 2d Array
// Returns a JavaScript 2d Array
// Example: arrayTranspose([[1,2,3],[4,5,6]]) returns [[1,4],[2,5],[3,6]].
function arrayTranspose_(data) {
if (data.length == 0 || data[0].length == 0) {
return null;
}
 
var ret = [];
for (var i = 0; i < data[0].length; ++i) {
ret.push([]);
}
 
for (var i = 0; i < data.length; ++i) {
for (var j = 0; j < data[i].length; ++j) {
ret[j][i] = data[i][j];
}
}
 
return ret;
}

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