In Vim how do I efficiently search and replace “ and ” with normal double quotes "

Question

I got this code snippet from a tutorial and I would like to search and replace all occurrences of “ and ”, with normal double quote ". How can I efficiently do it in Vim?

{
  “runtime”: {
  “DDP_DEFAULT_CONNECTION_URL”: “http://127.0.0.1:8100”
  },
  “import”: [
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”,
    “[email protected]”
  ]
}

Thank you.

Answer 1

You can show ascii code of character using ga in normal mode.
You can also put arbitrary utf8 code using Ctrl+vuhhhh for characters with code 0000 <= hhhh <= FFFF and Ctrl+vUhhhhhhhh for the rest in insert mode and command mode so when starting in normal mode you need to type, similar to @shash678 answer:

:%s/Ctrl+vu201c/"/g

Answer 2

In command-line mode you can use the following command to find each occurrence of “ and ” (in all lines), and replace them with ":

:%s/[“”]/"/g 

EDIT:

To do this, (assuming you have the file open in vim):

1) hit the ESC key to ensure you are Normal mode.

2) hit : , you will notice : has appeared in box at the bottom of vim (that is the command line).

3) type the rest of the command for finding each occurrence of “ and ” (in all lines), and replacing both with ".

4) hit the ENTER key.

5) your done! The command line will say something like made 56 substitutions on 13 lines.