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How to fix the “Bad escape sequence in string” error in Schemas

March 14, 2023
How to fix the Bad escape sequence in string error message

Here are some general tips that can help you avoid errors when writing a schema:

  1. Understand the syntax: Before you start writing your schema, make sure you understand the syntax rules and conventions for the schema language you are using. This will help you avoid common errors and ensure that your schema is well-formed.
  2. Use a schema validator: Many schema languages have tools or libraries that can help you validate your schema and detect errors before you try to use it. Use these tools to check your schema for syntax errors, missing or invalid properties, and other issues.
  3. Use escaping where necessary: If your schema includes special characters, such as quotes or backslashes, you may need to use escaping to avoid parsing errors. Check the documentation for your schema language to see what characters need to be escaped and how to do it properly.
  4. Keep it simple: Try to keep your schema as simple as possible. Complex schemas can be more difficult to parse and validate and are more prone to errors. Use only the properties and features that you need, and avoid unnecessary complexity.
  5. Test your schema: Once you have written your schema, test it thoroughly to ensure that it is working as expected. Use sample data to test your schema and validate that it is producing the correct results.

Other errors you might encounter

  • Bad JSON escape sequence: \’.
  • After parsing a value an unexpected character was encountered: s.
  • Error parsing comment. Expected: *, got a.

Remove all of the unnecessary elements from the Schema. For example:

{
  "@context": "https://schema.org",
  "@type": "FAQPage",
  "mainEntity": [
    {
      "@type": "Question",
      "name": "What is Projects Engine?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "<p>Projects Engine's primary purpose is to give high-quality WordPress tips, tricks, hacks, and other tools to help WordPress developers improve their skills.</p>"
      }
    },
    {
      "@type": "Question",
      "name": "How to edit the WooCommerce single product template programmatically?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "You may use a variety of WooCommerce hooks to delete any feature from a single product template. Each one can operate for a particular set of items, so make sure you use the right hook, WooCommerce callback function, and a priority value."
      }
    }
  ]
}

Use this function to filter the text:

function pe_filter_schema_content( $answer ) {
    $answer = preg_replace(
        array(
            '/ {2,}/',
            '/<!--.*?-->|\t|(?:\r?\n[ \t]*)+/s'
        ),
        array(
            ' ',
            ''
        ),
        $answer 
    );

    return strip_tags( $answer );
}

The will be replaced with \u2019 and the p tag will be removed. That way we reduce the chance of having any errors in our Schema.

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