Doerge
(Syntax Error) invalid or reserved Unicode code point
Hey everybody,
I get a response from a (pretty funky) API, and am trying to decode it with HTTPoison.
It fails with something like this:
{:error,
%Poison.ParseError{
data: " { \"config\": ...",
skip: 86293,
value: "\\ud83d"
}}
Toying around with it in IEx also doesn’t work:
iex(1)> tmp = "\ud83d"
** (SyntaxError) iex:1:8: invalid or reserved Unicode code point \u{d83d}. Syntax error after: \u
I’m not really sure how to proceed from here.
How can I clean up my string from invalid code points before decoding it? It’s ok for me to just drop the invalid ones, but I would like to keep the valid ones.
Marked As Solved
al2o3cr
\ud83d is a Unicode “surrogate pair” character; it’s normally followed by another character of the \uDxxx variety to represent a character above \uFFFF in UTF-16 systems. If there’s one in the text by itself (a “lone surrogate”) that string can’t be represented in UTF-8 at all and is invalid.
Jason can parse these (when they are paired):
iex(livebook_ky4n2p4p@Matts-MacBook-Pro-2)22> {:ok, decoded} = Jason.decode("{\"foo\":\"\\uD83D\\uDE04\"}")
{:ok, %{"foo" => "😄"}}
But oddly, doesn’t produce them:
iex(livebook_ky4n2p4p@Matts-MacBook-Pro-2)23> {:ok, encoded} = Jason.encode(decoded)
{:ok, "{\"foo\":\"😄\"}"}
iex(livebook_ky4n2p4p@Matts-MacBook-Pro-2)24> String.to_charlist(encoded)
[123, 34, 102, 111, 111, 34, 58, 34, 128516, 34, 125]
Also Liked
kip
Emoji are definitely part of the Unicode specification.
Doerge
Thanks for explaining, and pointing me to Jason! It works perfectly!
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Develop your skills with books, videos, and courses.
Categories:
Sub Categories:
Forums
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Practical resources that improve the lives of professional developers.
Producing high quality Elixir screencasts since 2017.
The deployment platform built for Elixir: PaaS ease, VPS control.
Courses that'll move you from confusion to "Aha, now I get it!"