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C.Decode and C.Encode - Encoding and Decoding

C.Decode – Data Decoding Methods
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C.Decode.base64()
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C.Decode.base64(val: string, resultEnc: string = 'utf8'): string | Buffer | undefined

Performs base64 decoding of the given string.

Returns a string or Buffer, depending on the resultEnc value.

ParameterTypeDescription
valstringValue to decode.
resultEnc'utf8' | 'utf8-valid' | 'buffer'Encoding to use to convert the binary data to a string. Use 'utf8‑valid' to validate that result is valid UTF8; use 'buffer' if you need the binary data in a Buffer. Defaults to 'utf8'.

Examples
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To decode an encoded field and return the decoded value as a Buffer, use:

C.Decode.base64(encoded, 'buffer')

C.Decode.gzip()
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C.Decode.gzip(value: Buffer | string, encoding?: BufferEncoding) : string

Gunzips the supplied value.

ParameterTypeDescription
valueanyValue to gunzip.
encodingstringEncoding of value, for example: 'base64', 'hex', 'utf-8', 'binary'. Default is 'base64'. If data is received as Buffer (from gzip with encoding:'none'), decoding is skipped.

Examples
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To decode a hostname field which had been encoded using hex, run:

C.Decode.gzip(hostname, 'hex')

C.Decode.hex()
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C.Decode.hex(val: string): number

Performs hex to number conversion. Returns NaN if value cannot be converted to a number.

ParameterTypeDescription
valstringHex string to parse to a number (for example, 0xcafe).

C.Decode.uri()
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C.Decode.uri(val: string): string

Performs URI-decoding of the given string.

ParameterTypeDescription
valstringValue to decode.

C.Decode.inflate()
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C.Decode.inflate(value: Buffer | string, encoding: BufferEncoding = 'base64', isRaw = false): string

Inflates the supplied value.

ParameterTypeDescription
valuestring | BufferThe value to inflate. May be a Buffer or a string.
encodingstringIf a string value is provided, this specifies how it has been encoded. If no encoding is provided, base64 is used. This parameter is ignored if value is already a Buffer.
isRawbooleanIndicates whether the data is in raw deflate format (without zlib headers). Default value is false.

Examples
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To base64-decode and inflate the value contained in a _raw field, you can use:

C.Decode.inflate(_raw)

To additionally specify a different encoding to use, run:

C.Decode.inflate(_raw, 'hex')

C.Encode – Data Encoding Methods
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C.Encode.base64()
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C.Encode.base64(val: string | Buffer, trimTrailEq: boolean = false, encoding?: BufferEncoding): string

Returns a base64 representation of the given string or Buffer.

ParameterTypeDescription
valanyValue to encode.
trimTrailEqbooleanWhether to trim any trailing =.
encodingstringOptional parameter that specifies the encoding of the value. Options include base64, hex, utf-8, and binary. The default is utf-8.

Examples
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To base64-encode the username field, and remove the trailing =, use:

C.Encode.base64(username, true)

To base64-encode the hexValue field, where the value of the field is a hex string:

C.Encode.base64('4672616e6b7575757575', undefined, 'hex')

C.Encode.gzip()
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C.Encode.gzip(value: Buffer | string, encoding?: string) : string | Buffer

Gzips, and optionally base64-encodes, the supplied value.

ParameterTypeDescription
valuestringValue to gzip.
encodingstringEncoding of value, for example: 'base64', 'hex', 'utf-8', 'binary', 'none'. Default is 'base64'. If 'none' is specified, data will be returned as a Buffer.

Examples
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To encode the hostname field, for example using hex encoding, run:

C.Encode.gzip(hostname, 'hex')

C.Encode.hex()
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C.Encode.hex(val: string | number): string

Rounds the number to an integer and returns its hex representation (lowercase). If a string is provided, it will be parsed into a number or NaN.

ParameterTypeDescription
valstring | numberValue to convert to hex.

C.Encode.uri()
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C.Encode.uri(val: string): string

Returns the URI-encoded representation of the given string.

ParameterTypeDescription
valstringValue to encode.

C.Encode.deflate()
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C.Encode.deflate(value: Buffer | string, encoding: BufferEncoding | 'none' = 'base64', toRaw = false): string | Buffer

Deflates and optionally base64-encodes the supplied value.

ParameterTypeDescription
valuestring | BufferValue to deflate.
encodingstringEncoding to apply to the deflated result, for example: base64, hex, utf-8, binary, none. Default is base64. If none is specified, data will be returned as a Buffer.
toRawbooleanIndicates whether to return the raw deflated data, without zlib headers. Default is false, which will prepend normal zlib header bytes to the returned value.

Examples
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To deflate and hex-decode the value provided in an inflated field, run:

C.Encode.deflate(inflated, 'hex')