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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.
 
var FORMAT_ONELINE = 'One-line';
var FORMAT_MULTILINE = 'Multi-line';
var FORMAT_PRETTY = 'Pretty';
 
var LANGUAGE_JS = 'JavaScript';
var LANGUAGE_PYTHON = 'Python';
 
var STRUCTURE_LIST = 'List';
var STRUCTURE_HASH = 'Hash (keyed by "id" column)';
 
/* Defaults for this particular spreadsheet, change as desired */
var DEFAULT_FORMAT = FORMAT_PRETTY;
var DEFAULT_LANGUAGE = LANGUAGE_JS;
var DEFAULT_STRUCTURE = STRUCTURE_LIST;
 
 
function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var menuEntries = [
{name: "Export JSON for this sheet", functionName: "exportSheet"},
{name: "Export JSON for all sheets", functionName: "exportAllSheets"},
{name: "Configure export", functionName: "exportOptions"},
];
ss.addMenu("Export JSON", menuEntries);
}
function exportOptions() {
var doc = SpreadsheetApp.getActiveSpreadsheet();
var app = UiApp.createApplication().setTitle('Export JSON');
var grid = app.createGrid(4, 2);
grid.setWidget(0, 0, makeLabel(app, 'Language:'));
grid.setWidget(0, 1, makeListBox(app, 'language', [LANGUAGE_JS, LANGUAGE_PYTHON]));
grid.setWidget(1, 0, makeLabel(app, 'Format:'));
grid.setWidget(1, 1, makeListBox(app, 'format', [FORMAT_PRETTY, FORMAT_MULTILINE, FORMAT_ONELINE]));
grid.setWidget(2, 0, makeLabel(app, 'Structure:'));
grid.setWidget(2, 1, makeListBox(app, 'structure', [STRUCTURE_LIST, STRUCTURE_HASH]));
grid.setWidget(3, 0, makeButton(app, grid, 'Export Active Sheet', 'exportSheet'));
grid.setWidget(3, 1, makeButton(app, grid, 'Export All Sheets', 'exportAllSheets'));
app.add(grid);
doc.show(app);
}
 
function makeLabel(app, text, id) {
var lb = app.createLabel(text);
if (id) lb.setId(id);
return lb;
}
 
function makeListBox(app, name, items) {
var listBox = app.createListBox().setId(name).setName(name);
listBox.setVisibleItemCount(1);
var cache = CacheService.getPublicCache();
var selectedValue = cache.get(name);
Logger.log(selectedValue);
for (var i = 0; i < items.length; i++) {
listBox.addItem(items[i]);
if (items[1] == selectedValue) {
listBox.setSelectedIndex(i);
}
}
return listBox;
}
 
function makeButton(app, parent, name, callback) {
var button = app.createButton(name);
app.add(button);
var handler = app.createServerClickHandler(callback).addCallbackElement(parent);;
button.addClickHandler(handler);
return button;
}
 
function makeTextBox(app, name) {
var textArea = app.createTextArea().setWidth('100%').setHeight('200px').setId(name).setName(name);
return textArea;
}
 
function exportAllSheets(e) {
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, getExportOptions(e));
var sheetName = sheet.getName();
sheetsData[sheetName] = rowsData;
}
var json = makeJSON_(sheetsData, getExportOptions(e));
return displayText_(json);
}
 
function exportSheet(e) {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getActiveSheet();
var rowsData = getRowsData_(sheet, getExportOptions(e));
var json = makeJSON_(rowsData, getExportOptions(e));
return displayText_(json);
}
function getExportOptions(e) {
var options = {};
options.language = e && e.parameter.language || DEFAULT_LANGUAGE;
options.format = e && e.parameter.format || DEFAULT_FORMAT;
options.structure = e && e.parameter.structure || DEFAULT_STRUCTURE;
var cache = CacheService.getPublicCache();
cache.put('language', options.language);
cache.put('format', options.format);
cache.put('structure', options.structure);
Logger.log(options);
return options;
}
 
function makeJSON_(object, options) {
if (options.format == FORMAT_PRETTY) {
var jsonString = JSON.stringify(object, null, 4);
} else if (options.format == FORMAT_MULTILINE) {
var jsonString = Utilities.jsonStringify(object);
jsonString = jsonString.replace(/},/gi, '},\n');
jsonString = prettyJSON.replace(/":\[{"/gi, '":\n[{"');
jsonString = prettyJSON.replace(/}\],/gi, '}],\n');
} else {
var jsonString = Utilities.jsonStringify(object);
}
if (options.language == LANGUAGE_PYTHON) {
// add unicode markers
jsonString = jsonString.replace(/"([a-zA-Z]*)":\s+"/gi, '"$1": u"');
}
return jsonString;
}
 
function displayText_(text) {
var app = UiApp.createApplication().setTitle('Exported JSON');
app.add(makeTextBox(app, 'json'));
app.getElementById('json').setText(text);
var ss = SpreadsheetApp.getActiveSpreadsheet();
ss.show(app);
return 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, options) {
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());
var objects = getObjects_(dataRange.getValues(), normalizeHeaders_(headers));
if (options.structure == STRUCTURE_HASH) {
var objectsById = {};
objects.forEach(function(object) {
objectsById[object.id] = object;
});
return objectsById;
} else {
return objects;
}
}
 
// 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;
}

Found this reading the article about you on lifehacker (http://lifehacker.com/5985434/im-pamela-fox-product-engineer-at-coursera-and-this-is-how-i-work). I have used Coursera once, and hope to have that pleasure again in the near future. Coursera blows away the online course management system used at the university in which I am currently enrolled (Kennesaw State University, GA). I love your coding style. A couple of colleagues and I are making a move towards naturally-documented code, of which I feel this is a great example. Keep up the great work. It is awesome to find another developer who is not dead set on making their code impossible to understand by mere humans!

Not sure if there's a nice way to notify you on this (doesn't seem like there are pull requests for gists) but I added a quick error message at https://gist.github.com/ralfharing/5810205/revisions .

Hi, is it possible to export a sheet to XML?

This has been very useful! Thanks a lot :)

mmm - getting an error "The coordinates or dimensions of the range are invalid. Details Dismiss" and details are 'Message details
The coordinates or dimensions of the range are invalid.' Tried selecting just a few rows or all of them but the same error comes up.

@pamelafox A million thank yous for this awesome script.

@v3nt I had the same "The coordinates or dimensions of the range are invalid." error, but it went away when I marked the top row as a header by freezing it. (View > Freeze Rows > Freeze Row 1)

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