JavaScript associative array to JSON

by

Arrays should only have entries with numerical keys (arrays are also objects but you really should not mix these).

If you convert an array to JSON, the process will only take numerical properties into account. Other properties are simply ignored and that’s why you get an empty array as result. Maybe this more obvious if you look at the length of the array:

> AssocArray.length
0

What is often referred to as “associative array” is actually just an object in JS:

var AssocArray = {};  // <- initialize an object, not an array
AssocArray["a"] = "The letter A"

console.log("a = " + AssocArray["a"]); // "a = The letter A"
JSON.stringify(AssocArray); // "{"a":"The letter A"}"

Properties of objects can be accessed via array notation or dot notation (if the key is not a reserved keyword). Thus AssocArray.a is the same as AssocArray['a'].

More Related Contents:

  1. Convert JS object to JSON string
  2. Post data to JsonP
  3. How to send JSON instead of a query string with $.ajax?
  4. Browser-native JSON support (window.JSON)
  5. Chrome sendrequest error: TypeError: Converting circular structure to JSON
  6. How to parse JSON to receive a Date object in JavaScript?
  7. Why is it a bad practice to return generated HTML instead of JSON? Or is it?
  8. Array.push() if does not exist?
  9. Why does JavaScript’s eval need parentheses to eval JSON data?
  10. How to stringify event object?
  11. Get JSON data from external URL and display it in a div as plain text
  12. Convert javascript object or array to json for ajax data
  13. Using Fetch API to Access JSON
  14. How to access nested JSON data
  15. How do I remove objects from a JavaScript associative array?
  16. Javascript search inside a JSON object
  17. Parsing JSON from XmlHttpRequest.responseJSON
  18. Express and ejs
  19. Separate Angular2 TypeScript files and JavaScript files into different folders, maybe ‘dist‘
  20. D3 – how to deal with JSON data structures?
  21. Chrome and IE sorts JSON Object automatically, how to disable this?
  22. JSON.stringify output to div in pretty print way
  23. Pass Json to karate-config.js file
  24. Passing JSON data from php to html-data attribute and then to Javascript
  25. Remove key-value pair from JSON object
  26. How to restore original object/type from JSON?
  27. Cross-Origin resource sharing and file://
  28. sending data as JSON object from Python to Javascript with Jinja [duplicate]
  29. Process a continuous stream of JSON
  30. Push JSON Objects to array in localStorage

Leave a Comment