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web api instance method

WorkerGlobalScope: atob() method

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Available in workers

The atob() method of the WorkerGlobalScope interface decodes a string of data which has been encoded using Base64 encoding. You can use the btoa() method to encode and transmit data which may otherwise cause communication problems, then transmit it and use the atob() method to decode the data again. For example, you can encode, transmit, and decode control characters such as ASCII values 0 through 31.

Syntax

atob(encodedData)

Parameters

  • encodedData
    • : A binary string (i.e., a string in which each character in the string is treated as a byte of binary data) containing base64-encoded data.

Return value

An ASCII string containing decoded data from encodedData.

Exceptions

  • InvalidCharacterError DOMException
    • : Thrown if encodedData is not valid base64.

Examples

const encodedData = self.btoa("Hello, world"); // encode a string
const decodedData = self.atob(encodedData); // decode the string

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also