Tips on preventing the occurrence of double encoding in raw JSON output from a view

I am encountering a JavaScript error while attempting to parse JSON data obtained from my controller:

Uncaught SyntaxError: Unexpected token & in JSON at position 1 at JSON.parse () at stores:76

This is the code I use to serialize my list of elements (so I can send it as a string to the frontend and then parse it with JSON.parse())

FeatureCollection mapFeatureCollection = new FeatureCollection(mapFeatures); // this is my object

// Use the ToJson method provided by FeatureCollection instances to convert them into JSON strings before sending them to the frontend
string nearbyStoresAsGeoJSON = JsonConvert.SerializeObject(mapFeatureCollection, Formatting.Indented);

// pass the json to view to mark them
ViewBag.nearbyStores = nearbyStoresAsGeoJSON;
return View("Stores");

I suspect the issue arises when I receive the JSON in the frontend and log it to the console, here is what I observe:

{
 ... (the JSON content)...}

Answer №1

If you find yourself in a situation where the JSON is being double-escaped or encoded, it may be due to the Razor Helper @ automatically encoding input and returning HTML entities for certain characters like quotes, ampersands, less/greater signs, etc.

To handle this issue, you can utilize the @Html.Raw method to specify that the input is already an encoded string.

var stores = '@Html.Raw(ViewBag.nearbyStores)';
var geojson = JSON.parse(stores);

It's important to exercise caution as there could be potential injection attacks (such as an unescaped single quote) from the source variable.

For a more streamlined approach, you should consider bypassing the extra parsing step altogether:

var stores = @Html.Raw(ViewBag.nearbyStores);

This assumes that the nearbyStores variable contains valid JSON data.

Instead of serializing data in the controller, you can delegate this task to the view by utilizing JsonHelper.Serialize

//controller 
ViewBag.nearbyStores = mapFeatureCollection;
// view
var stores = @Html.Raw(Json.Serialize(ViewBag.nearbyStores));

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