1Introduction
1.1. About JavaScript
1.2. HASH files
1.3. JS files in #/API
2General functions
2.1. if(criteria)
2.2. else
2.3. function name, params
2.4. return value
2.5. break
2.6. continue
2.7. typeof value
2.8. switch(value)
2.9. import filename
2.10. try statements, catch, finally
3Directives
3.1. Include directive(file)
3.2. Master directive(file)
4Chapter functions
4.1. Chinit(name)
4.2. Chstep(name)
4.3. Chdestep(name)
4.4. Chpush(name)
4.5. Chpop(name)
5Date and time functions
5.1. dateDiff(date1, date2)
5.2. Formatting dates
5.3. new Date()
5.4. addSeconds(datetime, seconds)
5.5. addMinutes(datetime, minutes)
5.6. addHours(datetime, hours)
5.7. addDays(date, days)
5.8. addMonths(datetime, months)
5.9. addYears(datetime, years)
6Filesystem functions
6.1. getFiles(path, searchPattern, depth, mode)
6.2. getFolder(path)
6.3. fileExists(filePath)
6.4. folderExists(path)
6.5. createFolder(folderPath, folderType, folderData)
6.6. deleteFile(filePath)
6.7. deleteFolder(folderPath)
6.8. getFolderProps(folderPath)
6.9. saveFolderProps(folderPath, properties)
6.10. validateFilename(filename)
6.11. extractBase64Images(html)
6.12. extractAndEmbedBase64Images(filePath, propertyFilter)
6.13. createZip(content)
6.14. getEmbeddedFile(path, id)
6.15. Include(path, template)
6.16. saveEmbeddedFolderFile(folderPath, embeddedFilename, data)
6.17. allowRead(path)
6.18. allowModify(path)
6.19. allowVisit(path)
6.20. getEmbeddedFileSize(path, id)
6.21. getFolders(path, searchPattern, depth)
6.22. getEmbeddedTextFile(path, id, encoding)
6.23. getEmbeddedFolderFile(folderPath, embeddedFilename)
6.24. getFile(filepath, metadata)
6.25. getJson(filepath)
6.26. linkFile(embeddedId, filename)
6.27. listFiles(path, searchPattern, tags, recursive, metaOnly)
6.28. listFolders(path, searchPattern, recursive, includeCounters)
6.29. linkImage(embeddedId, width, height, mode)
6.30. Image scaling
6.31. loadExcel(filename, column, row, sheet)
6.32. moveFile(filePath, toPath)
6.33. moveFolder(folderPath, destinationPath)
6.34. renameFile(filePath, newName)
6.35. saveEmbeddedFile(filePath, embeddedId, data)
6.36. patchFile(filePath, patchData)
6.37. saveFile(filePath, data, schema, ensurePath)
6.38. saveJson(filePath, data, ensurePath)
6.39. logJson(filePath, data)
7Math functions
7.1. Math calculations
7.2. Math.atan
7.3. Math.random
7.4. Math.cos
7.5. Math.PI
7.6. Math.sin(value)
7.7. Math.sqrt(value)
7.8. Math.tan(angle)
7.9. Math.abs(value)
7.10. Math.pow(base, exponent)
7.11. Math.ceil(value)
7.12. Math.floor(value)
7.13. Math.round(value)
8Array functions
8.1. Array.concat(list)
8.2. Array.every(callback)
8.3. Array.filter(filter)
8.4. Array.find(filter)
8.5. Array.forEach(callback)
8.6. Array.groupBy(key)
8.7. Array.indexOf(item)
8.8. Array.join(seperator)
8.9. Array.length
8.10. Array.pop
8.11. Array.push(item)
8.12. Array.reverse
8.13. Array.shift
8.14. Array.isArray
8.15. Array.slice(start, end)
8.16. Array.some(evaluator)
8.17. Array.sort(sorter)
8.18. Array.splice(start, deleteCount, item1...N)
9Network functions
9.1. getRemoteIp
9.2. downloadFromUrl(url)
9.3. downloadFromUrl64(url)
9.4. httpGet(url, headers)
9.5. httpPut(url, data, headers)
9.6. httpPost(url, data, headers)
9.7. httpFormPost(url, data, headers)
9.8. getUploadBase64(filename)
9.9. getUploads
10Output functions
10.1. process(script, cursor)
10.2. console.assert(condition, message)
10.3. setContentDisposition(type, filename)
10.4. htmlToXlsx(filename, html)
10.5. htmlToPdf(filename, html, usePrintCss)
10.6. base64(data)
10.7. setMime(mime)
10.8. write(text)
10.9. setResultCode(code)
10.10. getHeader(name)
10.11. setHeader(name, value)
10.12. request
10.13. format(value, format)
10.14. Formatting numbers
10.15. HTML.format(html)
10.16. JSON.format(json)
10.17. redirect(url)
10.18. JSON.parse(json)
10.19. JSON.stringify(value)
10.20. console.log(text)
10.21. setCulture(culture)
10.22. textToHtml(text)
10.23. Chr(code, ...)
10.24. setExecutionTimeout(timeout)
11String functions
11.1. guid
11.2. guid2
11.3. md5(text)
11.4. sha256(text)
11.5. Template literal (template strings)
11.6. textDecode(bytes, encoding)
11.7. textEncode(text, encoding)
11.8. toHtml(text, text2, ...)
11.9. encodeFilename(filename)
11.10. decodeFilename(filename)
11.11. encodeURI(text)
11.12. encodeURIComponent(text)
11.13. htmlAttributeEncode(text)
11.14. htmlEncode(text)
11.15. removeEmptyLines(text)
11.16. String.concat(string1, string2, ...)
11.17. String.includes(search)
11.18. String.substring(start, end)
11.19. String.indexOf(text)
11.20. String.lastIndexOf(text)
11.21. String.normalize
11.22. String.repeat(times)
11.23. String.replace(find, replace)
11.24. String.split(seperator)
11.25. String.endsWith(text)
11.26. String.startsWith(text)
11.27. String.trim
11.28. stripTags(html)
11.29. urlEncode(text)
12Validation functions
12.1. isNumber(value, minValue, maxValue)
12.2. isString(value, minLength, maxLength)
12.3. areEqual(value1, value2)
12.4. areNotEqual(value1, value2)
12.5. isNull(value)
12.6. isNotNull(value)
12.7. isName(value)
12.8. isEmail(value)
12.9. assert(description, resultCode)
12.10. isDate(value)
12.11. isDateTime(value)
13Share functions
13.1. download(file, template, preview)
13.2. getFileShares(path)
13.3. addFileShare(file, user, access, message)
13.4. removeFileShare(file, user)
13.5. sendEmail(file, template, receiver, subject, message)
13.6. downloadEmbedded(file, embeddedId, filename)
13.7. generateDocument(file, template)
13.8. sendForm(form, subject, sendTo, smtp, subjectPrefix, addSenderInfo)
13.9. addFolderShare(path, user, access, message)
13.10. getFolderShares(path)
13.11. removeFolderShare(path, user)
13.12. downloadBytes(data, filename, preview)
14Authentication
14.1. writeJwt(userinfo)
14.2. denyAccess
14.3. flagActivity
14.4. deleteJwt
14.5. getProfilePictureUrl(user)
15Mail functions
15.1. pop3.pop(options)
15.2. pop3.delete(options, identifier)
15.3. pop3.get(options, identifier)
15.4. pop3.getHeader(options, identifier)
15.5. smtp.send(config, message)
15.6. imap.connect(config)
15.7. imap.getCount(session, folder)
15.8. imap.delete(session, message)
15.9. imap.getMessage(session, index / uid, headersOnly, folder)
15.10. imap.disconnect(connection)
16Counter functions
16.1. counters.set(name, value, counterFile)
16.2. counters.get(name, counterFile)
16.3. counters.inc(name, value, counterFile)

Home
JavaScript
Validation functions
IsNull

isNull(value) Last updated: 04. Mar 2025

Checks if specified value is null.

Parameters

Name	Type	Description
value	object

Returns

True if null, otherwise false.

Example

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