Somewhere in a database column, a log file or an environment variable sits a perfectly good JSON object wearing a string costume: "{\"name\":\"Ana\"}". Unstringify JSON removes the costume — decoding the escaped quotes and backslashes — and returns the real, formatted JSON you can read, edit and reuse.
It is the exact inverse of the Stringify JSON tool. Paste the wrapped value, and the tool detects it as a string, unescapes it, and re-parses the contents as JSON so you know the result is valid. Everything happens locally in your browser.