When transferring a file path from a Xamarin Forms C# app to JavaScript, watch out for missing escape characters

I am facing an issue with my Xamarin Forms app where JavaScript is being called and a JSON string containing a path is sent as a parameter. The problem arises when the backslashes get double-escaped in C#, but only single backslashes remain when it reaches the JavaScript function, causing the JSON parsing to fail.

"myreturnfunc('', '{\"statusCode\":\"200\",\"path\":\"\\\\temp\\\\Uploads\\\\100650\\\\IMG_20200107_094705_5.jpg\"}');"

My question is, how can I ensure that the escaped backslashes are correctly retained? Interestingly, when the method is called from another JavaScript function, the format remains intact:

{"path":"\\temp\\Uploads\\100650\\IMG_20200107_094705_5.jpg","statusCode":"200"}
javascriptjsonformsxamarin

Answer №1

Json.parse often faces double escapes when the parameter of json.parse contains special characters, with the first escape being for the string itself and the second escape for the actual JavaScript object.

For instance, in the string 

\"path\":\"\\\\temp\\\\Uploads\\\\100650\\\\IMG_20200107_094705_5.jpg\"
provided above,

The initial parser interprets the backslashes as escaping each other, resulting in an output like 

"path":"\\temp\\Uploads\\100650\\IMG_20200107_094705_5.jpg"
(which can be confirmed using console.log).

However, another escape is required when converting it into a JavaScript object officially, leading to the final result of 

"path":"\temp\Uploads\100650\IMG_20200107_094705_5.jpg"
.

In conclusion, if you want a single backslash in a JavaScript object, you need to use four backslashes in a JSON string.

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