Flutter JSON encode raw string

Question

So I have this json data that contains strings \r (carriage return) and \n (new line) - It's from Firebase. The problem is when I encode the data using json.encode it add an escaping character. So \r becomes \\r. I'm sending that data to an another server. json.encode works as expected if I do json.encode({'hello': 'world\r\n'}) but it adds \ when I used it on my other string.

Am I missing something? Is there some type of encoding to prevent it from adding \?

It sounds like your JSON data does not contain carriage return and newline characters but contains the literal character sequences '\', 'r' and '\', 'n'. — jamesdlin
– jamesdlin, Commented Feb 23, 2022 at 4:18
It does contains character literal since Firebase only support that. Would a replace all \r with \r do the trick? — SomeCoder
– SomeCoder, Commented Feb 23, 2022 at 4:21
what is the problem with the escaped JSON data? When you decode it'll be removed automatically. There is no such harm. — Omi Shah
– Omi Shah, Commented Feb 23, 2022 at 4:46

jamesdlin · Accepted Answer · 2022-02-23 04:42:47Z

1

It seems that the data you received does not contain CR and LF characters but contains their escape sequences (\ followed by r and \ followed by n). Therefore when you encode that to JSON, it will be escaped again.

You could do:

data = data.replaceAll('\\r', '\r').replaceAll('\\n', '\n');

which probably would work most of the time, but it would have the corner case of undesirably replacing occurrences that were explicitly intended to be escaped. (That is, a string '\\n' would be transformed to a sequence \, LF.)

Since the data is already escaped, you probably could unescape it with json.decode. Of course, decoding the data as JSON just to re-encode it to JSON seems a little silly, so if it's already properly encoded JSON, you ideally should pass it through it unchanged.

answered Feb 23, 2022 at 4:42

jamesdlin

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