Managing backslashes during the processing of JSON

I am currently facing an issue with a JSON string that I am trying to parse using the JSON.parse method. The problem seems to be related to the presence of backslashes and parentheses in the string, which results in an 'invalid character' error.

While online parsers handle the string correctly, my JavaScript code fails to parse it. I have attempted to clean the string in various ways, such as replacing backslashes, but have been unsuccessful in getting it to parse.

var cleanData = data.replace(/\\"/, /\\\\/);

Below is a snippet of the JSON file that is causing the parsing issue. Removing this portion allows the JSON.parse method to work, leading me to believe the problem is isolated to this specific part. Can anyone suggest a general clean method that could help me parse this successfully?

'{"Properties" : {
    "GenerationId" : 9223372036854776000,
    "indexSystem" : "",
    "ExecutionTimeMs" : 109,
    "QueryModification" : "path:\"https://mysite.sharepoint.com/sites/Test\"  (IsDocument:\"True\" OR contentclass:\"STS_ListItem\") ContentTypeId:0x0120D5200098CBB075E51C8C4398ECCB4B4928912D*",
    "RenderTemplateId" : "~sitecollection/_catalogs/masterpage/Display Templates/Search/Group_Default.js",
    "StartRecord" : 0,
    "piPageImpressionBlockType" : 2
}}

Any suggestions on how to tackle this issue would be greatly appreciated. Thank you.

javascriptjson

Answer №1

The issue here is that the backslash is being interpreted as an escape character in the string:

'\"' === '"' // true

To resolve this, you need to properly escape the backslashes so that the JSON parser recognizes them. Here's an example to illustrate:

var unencoded = 'string with "quotes"';

'"string with \"quotes\""'   === JSON.stringify(unencoded); // false
'"string with \\"quotes\\""' === JSON.stringify(unencoded); // true

It's important to consider where the escaping should be handled based on how the JSON data is being utilized in JavaScript. When the JSON is embedded within the page by a server-side script, using JSON.parse may not be necessary as valid JSON is also valid JavaScript:

// If JsonData is valid JSON, it can be directly assigned as a JavaScript object
var data = <%= JsonData %>;

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