Check if string is valid base64 javascript

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"Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation."MDN

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Base64 encoding uses only letters a-z, A-Z, 0-9 and plus, slash and equals sign characters. This encoding scheme takes every 6 bits of the input string and assigns one of 64 letters to it. It's easy to calculate that base64 produces a larger output than the original string. As every sextet of bits now takes one character, the overhead is 33%.

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Works fine for type checking within your codebase; Doesn't provide any kind of protection against malformed input (for example, when receiving input from API) Isn't designed to express typical input validation constraints (minimum array length, string matching a certain pattern) that are about more than simple type safetyChecking the type of data such as string vs number for fields such as social security number. Ensuring that the value entered is a valid value such as country, date, and so on. How to set up client side validation

Compared to typeof approach, the try/catch is more precise because it determines solely if the variable is not defined, despite being initialized or uninitialized.. 4. Using window.hasOwnProperty(). Finally, to check for the existence of global variables, you can go with a simpler approach. Each global variable is stored as a property on the global object (window in a browser environment ...The method accepts a base64-encoded string representation of an .xlsx file as an optional parameter. The resulting workbook will be a copy of that file, assuming the string argument is a valid .xlsx file. You can get your add-in's current workbook as a base64-encoded string by using file slicing.