CompressionStream: CompressionStream() constructor
Baseline 2023Newly available
Since May 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
Note: This feature is available in Web Workers.
The CompressionStream() constructor creates a new CompressionStream object which compresses a stream of data.
Syntax
new CompressionStream(format)
Parameters
format-
One of the following allowed compression formats:
"gzip"-
Compresses the stream using the GZIP format.
"deflate"-
Compresses the stream using the DEFLATE algorithm in ZLIB Compressed Data Format. The ZLIB format includes a header with information about the compression method and the uncompressed size of the data, and a trailing checksum for verifying the integrity of the data
"deflate-raw"-
Compresses the stream using the DEFLATE algorithm without a header and trailing checksum.
Exceptions
TypeError-
Thrown if the format passed to the constructor is not supported.
Examples
In this example a stream is compressed using gzip compression.
const compressedReadableStream = inputReadableStream.pipeThrough(
new CompressionStream("gzip"),
);
Specifications
| Specification |
|---|
| Compression # dom-compressionstream-compressionstream |
Browser compatibility
| desktop | mobile | server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CompressionStream() constructor | ||||||||||||||
"deflate" compression | ||||||||||||||
"deflate-raw" compression | ||||||||||||||
"gzip" compression | ||||||||||||||