JSON: why are forward slashes escaped?

by

JSON doesn’t require you to do that, it allows you to do that. It also allows you to use “\u0061” for “A”, but it’s not required, like Harold L points out:

The JSON spec says you CAN escape forward slash, but you don’t have to.

Harold L answered Oct 16 ’09 at 21:59

Allowing \/ helps when embedding JSON in a <script> tag, which doesn’t allow </ inside strings, like Seb points out:

This is because HTML does not allow a string inside a <script> tag to contain </, so in case that substring’s there, you should escape every forward slash.

Seb answered Oct 16 ’09 at 22:00 (#1580667)

Some of Microsoft’s ASP.NET Ajax/JSON API’s use this loophole to add extra information, e.g., a datetime will be sent as "\/Date(milliseconds)\/". (Yuck)

More Related Contents:

  1. Convert JS object to JSON string
  2. Loading local JSON file
  3. Finding the max value of an attribute in an array of objects
  4. Converting JavaScript object with numeric keys into array
  5. Unexpected token colon JSON after jQuery.ajax#get
  6. Parsing JSON objects for HTML table
  7. How can I beautify JSON programmatically? [duplicate]
  8. Why is it a bad practice to return generated HTML instead of JSON? Or is it?
  9. Array.push() if does not exist?
  10. Why does JavaScript’s eval need parentheses to eval JSON data?
  11. How to stringify event object?
  12. Get JSON data from external URL and display it in a div as plain text
  13. Convert javascript object or array to json for ajax data
  14. Using Fetch API to Access JSON
  15. Removing duplicate objects with Underscore for Javascript
  16. How to access nested JSON data
  17. Javascript search inside a JSON object
  18. How to get json key and value in javascript?
  19. Parsing JSON from XmlHttpRequest.responseJSON
  20. Express and ejs
  21. Nested JSON objects – do I have to use arrays for everything?
  22. Separate Angular2 TypeScript files and JavaScript files into different folders, maybe ‘dist‘
  23. JS Object this.method() breaks via jQuery
  24. D3 – how to deal with JSON data structures?
  25. Chrome and IE sorts JSON Object automatically, how to disable this?
  26. Pass Json to karate-config.js file
  27. Passing JSON data from php to html-data attribute and then to Javascript
  28. How to make javascript fetch synchronous?
  29. Why does JSON.stringify return empty object notation “{}” for an object that seems to have properties?
  30. Recursive tree search in a nested object structure in JavaScript

Leave a Comment