CODEWITHSUNDEEP
javascriptjsonreplace
Miggoh
Miggoh

Reputation: 3

How to use string.replace() with JSON strings?

I have a backend that's sending invalid JSON strings. It escapes vertical tabs as \v which is not valid in JSON and ends up being rejected by the parser.

I am trying to remedy the problem in the frontend JSON decoder:

function fromJson(json) {
  if(typeof json === "string") {
    var jsonString = json.replace(/\v/g, "\u000B");
    return JSON.parse(jsonString)
  }
  else {
    return json
  }
}

Expected output: new string with all instances of \v replaced with the unicode line tabulation.

Actual output:

JSON.parse: SyntaxError: Unexpected token v in JSON at position...

Upvotes: 0

Views: 393

Answers (1)

D Malan
D Malan

Reputation: 11414

Javascript interprets \ characters as special characters in regular expressions. It expects the character after the \ to have a special meaning, but v isn't one of the special characters. Hence the exception Unexpected token v in JSON.

To fix your issue you need to escape the \ character in your regex with another \, e.g. json.replace(/\\v/g, "\u000B");

Upvotes: 1

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