What are the best practices for securely using JSON.stringify in JavaScript?

When I use JSON.stringify on a string that includes <script> tags, the script tags somehow escape and show up in the body of my document, causing unexpected results with the "injected" data.

I'm puzzled by how they manage to escape, considering that quotation marks are escaped when using JSON.stringify. I even tried using JSON2.stringify but it didn't solve the issue.

Answer №1

When utilizing a JSON string as code, such as an object literal, it is important to be cautious of the script tags in order to avoid any potential issues.

The script tags are treated as HTML elements before the JavaScript content within them is processed. This means that even if the script tag is enclosed within a string in the code, it will still be detected by the HTML parser. It's not limited to just JSON strings; whenever a script tag is placed within a string in JavaScript code, this behavior occurs.

To prevent script tags from being recognized as HTML tags, additional characters can be inserted within them. For instance, altering them to <scr\ipt> or <scr"+"ipt> can help mitigate this issue.

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