Encoding Functions¶

Encoding and decoding functions: Base64, hex, URL encoding, and more.

Summary¶

Function	Signature	Description
`base64_decode`	`string -> string`	Decode base64 string
`base64_encode`	`string -> string`	Encode string to base64
`base64url_decode`	`string -> string`	Decode base64url (RFC 4648 §5) string
`base64url_encode`	`string -> string`	Encode string to base64url (RFC 4648 §5, no padding)
`hex_decode`	`string -> string`	Decode hex string
`hex_encode`	`string -> string`	Encode string to hex
`html_escape`	`string -> string`	Escape HTML special characters
`html_unescape`	`string -> string`	Unescape HTML entities
`jwt_decode`	`string -> object`	Decode JWT payload (claims) without verification
`jwt_header`	`string -> object`	Decode JWT header without verification

Functions¶

base64_decode¶

Decode base64 string

Signature: string -> string

Examples:

# Decode hello
base64_decode('aGVsbG8=') -> \"hello\"
# Decode test
base64_decode('dGVzdA==') -> \"test\"
# Empty string
base64_decode('') -> \"\"

CLI Usage:

echo '{}' | jpx 'base64_decode(`"aGVsbG8="`)'

base64_encode¶

Encode string to base64

Signature: string -> string

Examples:

# Encode hello
base64_encode('hello') -> \"aGVsbG8=\"
# Encode test
base64_encode('test') -> \"dGVzdA==\"
# Empty string
base64_encode('') -> \"\"

CLI Usage:

echo '{}' | jpx 'base64_encode(`"hello"`)'

base64url_decode¶

Decode base64url (RFC 4648 §5) string

Signature: string -> string

Examples:

# Decode hello
base64url_decode('aGVsbG8') -> "hello"
# Decode test
base64url_decode('dGVzdA') -> "test"
# Empty string
base64url_decode('') -> ""

CLI Usage:

echo '{}' | jpx 'base64url_decode(`"aGVsbG8"`)'

base64url_encode¶

Encode string to base64url (RFC 4648 §5, no padding)

Signature: string -> string

Examples:

# Encode hello
base64url_encode('hello') -> "aGVsbG8"
# Encode test
base64url_encode('test') -> "dGVzdA"
# Empty string
base64url_encode('') -> ""

CLI Usage:

echo '{}' | jpx 'base64url_encode(`"hello"`)'

hex_decode¶

Decode hex string

Signature: string -> string

Examples:

# Decode hello
hex_decode('68656c6c6f') -> \"hello\"
# Decode test
hex_decode('74657374') -> \"test\"
# Empty string
hex_decode('') -> \"\"

CLI Usage:

echo '{}' | jpx 'hex_decode(`"68656c6c6f"`)'

hex_encode¶

Encode string to hex

Signature: string -> string

Examples:

# Encode hello
hex_encode('hello') -> \"68656c6c6f\"
# Encode test
hex_encode('test') -> \"74657374\"
# Empty string
hex_encode('') -> \"\"

CLI Usage:

echo '{}' | jpx 'hex_encode(`"hello"`)'

html_escape¶

Escape HTML special characters

Signature: string -> string

Examples:

# Escape tags
html_escape('<div>') -> \"&lt;div&gt;\"
# Escape ampersand
html_escape('a & b') -> \"a &amp; b\"
# Escape quotes
html_escape('\"quoted\"') -> \"&quot;quoted&quot;\"
# Sanitize input
html_escape(user_input) -> safe for HTML

CLI Usage:

echo '{}' | jpx 'html_escape(`"<div>"`)'

html_unescape¶

Unescape HTML entities

Signature: string -> string

Examples:

# Unescape tags
html_unescape('&lt;div&gt;') -> \"<div>\"
# Unescape ampersand
html_unescape('a &amp; b') -> \"a & b\"
# Unescape quotes
html_unescape('&quot;quoted&quot;') -> \"\\\"quoted\\\"\"
# Decode entities
html_unescape(escaped) -> original

CLI Usage:

echo '{}' | jpx 'html_unescape(`"&lt;div&gt;"`)'

jwt_decode¶

Decode JWT payload (claims) without verification

Signature: string -> object

Examples:

# Extract subject claim
jwt_decode('eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2VyXzEyMyJ9.sig').sub -> \"user_123\"
# Extract name claim
jwt_decode('eyJhbGciOiJIUzI1NiJ9.eyJuYW1lIjoiSm9obiJ9.sig').name -> 'John'

CLI Usage:

echo '{}' | jpx 'jwt_decode(`"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2VyXzEyMyJ9.sig"`).sub'

jwt_header¶

Decode JWT header without verification

Signature: string -> object

Examples:

# Extract algorithm
jwt_header('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.payload.sig').alg -> \"HS256\"
# Extract type
jwt_header('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.payload.sig').typ -> \"JWT\"

CLI Usage:

echo '{}' | jpx 'jwt_header(`"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.payload.sig"`).alg'