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I get fields of type String with some Unicode characters instead of the usual

My problem is that I am getting strings where some characters are Unicode.
"fieldName": "Ac6jHguQjKKUxx6MSOpjO2kOLKPAdjStVs1pgTGNSU8\u003d"
Then I immediately send such a string to another API and the server returns me an error with a code of 500. If I use this string in postman and replace the unicode with a normal one, then the code 200 is returned from the server.
I thought there was a problem in the server, but they checked it and said that they were sending it as expected.
How do I translate Unicode?

The easiest way is to use URLDecoder. Here is an example.
String str = "Ac6jHguQjKKUxx6MSOpjO2kOLKPAdjStVs1pgTGNSU8\u003d";
String decode = URLDecoder.decode(str, "UTF-8");
System.out.println(decode);
//Ac6jHguQjKKUxx6MSOpjO2kOLKPAdjStVs1pgTGNSU8=

How to add travel word to JSON?

my json is
{[{"key1":"value1","key2":"valu2"},{“ key3":"value3","key4":"valu4”}]}
How to change the above text as follows. Thank you for helping my friends
{"travel": [{"key1":"value1","key2":"valu2"},{ key3":"value3","key4":"value4}]}

Your original String is not a valid JSON for two reasons:
1 we can see some invalid quotes
2 elements inside a json object must have keys.
so assuming that your String is correct to achieve what you need in java you can do the following:
String string="{[{\"key1\":\"value1\",\"key2\":\"valu2\"},{\" key3\":\"value3\",\"key4\":\"valu4\"}]}";
StringBuilder stringBuilder=new StringBuilder(string);
stringBuilder.insert(1,"\"travel\":");
String json=stringBuilder.toString();
You just insert your key after the first character. Hope this will help.

Put String to JSONObject wrong value

I try to put image saved in base64 to JSONObject. Everything is ok but when I put String to jsonobject: verificationDataPersonal.put("file_data", imageObj.getFile_data()); before every "/" i get sign "\". So in String I have value: /9j/4AAQSkZJRg... and when i put string to json I get: \/9j\/4AAQSkZJRg... There is any way to prevent this?

I think it is not a problem, maybe the first "\" is an escape sequence, isn't it?
Have you proved to convert it back from JSON to String to see if it comes back ok?

How do i parse and format Google Directions JSON?

I am trying to parse the "html_instructions" string from the "steps" array at this link:
I have no trouble parsing the string, but it returns with bits of code mixed in. For Example, the parsed string of:
"html_instructions" : "Head \u003cb\u003esouthwest\u003c/b\u003e toward \u003cb\u003eCapitol Square SW\u003c/b\u003e",
Appears as:
Head<br>southwest"</br>"towards<br>...
Instead of appearing simply as:
Head southwest towards...
Is there a way i can format the string to remove the "breaks"? Any help is greatly appreciated.

You can use a regex to remove HTML tags from your content.
String htmlString = "Head<br>southwest</br>towards<br>...";
String noHtml = htmlString.replaceAll("<[^>]*>", "");

Look into answer for this question.
How to convert unicode in JavaScript?
Basically the response is in Unicode, hence the < is represented by \u003c & > by \u003e you can use String manipulation to replace these strings with appropriate charterers.
Try doing something like this
String parseResponse = response.replaceAll("\u003c","<");
This will get your string in the proper html format.

Android reading cookies

Hey, how can I read a value of a cookie?
Example:
String cs = CookieManager.getInstance().getCookie();
System.out.println("Cookies string: "+cs);
This will give me a string which has to be parsed with split on ';' and '='. Is there a "cookie string reader" or smth? Is there any other way of reading the value of only one particular cookie in the webview?
Thx!

Well, I suggest that you parse the string into an Array yourself. That would then be something along these lines in standard Java:
String[] x = Pattern.compile(";").split(CookieManager.getInstance().getCookie());
Now you have an Array of name - value pairs, which you can further parse and then store.