SourceExpression is a string expression.

Target should be a memo, or string large enough to contain the result.

Encoding is type HTTP percent encoding type, as WebOutput:

• 4 JSON UTF-8 - see below
• 3 The string is first base64 encoded, then encoded as 2
• 2 The string is made safe to insert in a URI: everything is encoded except alphanumerics and -._~
• 1 The string is assumed to be a URI:everything is encoded except alphanumerics and reserved characters acccording to RFC 3986 section 2.3 !*'();:@&=+$,/?#[]

If Encoding is set to 4, Equinox creates a UTF-8 string compatible with JavaScript Object Notation (JSON). See RFC 4627 section 2.5 for full details; non-printable characters are converted to "\u00XX", and other characters are escaped, for example linefeed becomes "\n".

This example outputs a data uri containing a picture encoded in base64:

memo m, mb

m = MyPicture
WebEncode mid(m, 4), mb, 3
weboutput $ $