I have encoded some text in C# like below:
var encodedCredential = Convert.ToBase64String(Encoding.Unicode.GetBytes(JsonConvert.SerializeObject("Sample text")));
The encoded String is :IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA=
I want to decode the encoded String in java script.
I have tried the below
decodeURIComponent(atob("IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA="))
decodeURIComponent(atob("IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA=").replace(' ',''))
The result is something different, There are some spaces in each letter. I cant even replace the spaces.
You need to use UTF-8 encoding in C#. Export base64 by this command
Convert.ToBase64String(Encoding.UTF8.GetBytes("Sample text"))
#King_Fisher, you shouldn't be getting additional spaces, also the replace method will replace a single occurrence.
Here's what I did with your code (see attached screenshot)
Related
I'm parsing a Uint8 array that is an HTML document. It contains a script tag which in turn contains JSON data that I would like to parse.
I first converted the array to text:
data = Buffer.from(str).toString('utf8')
I then searched for the script tag, and extracted the string containing the JSON:
... {\"phrase\":\"Go to \"California\"\",\"color\":\"red\",\"html\":\"<div class=\"myclass\">Ok</div>\"} ...
I then did a replace to clean it up.
data = data.replace(/\\"/g, "\"").replace(/\\/g, "").
{"phrase":"Go to "California"","color":"red","html":"<div class="myclass">Ok</div>"}
I tried to parse using JSON.parse() and got an error because the attributes contain quotes. Is there a way to process this further using a regex ? Or perhaps a library? I am working with Cheerio, so can use that if helpful.
The escape characters are necessary if you want to parse the JSON. The embedded quotes would need to be double escaped, so the extracted text isn't even valid JSON.
"{\"phrase\":\"Go to \\\"California\\\"\",\"color\":\"red\",\"html\":\"<div class=\\\"myclass\\\">Ok</div>\"}"
or, using single quotes:
'{"phrase":"Go to \\"California\\"","color":"red","html":"<div class=\\"myclass\\">Ok</div>"}'
Thanks.
After some more tinkering around, I realized that I should have encoded the data to Uint8 at the source (a Lambda function) before transmitting it for further processing. So now, I have:
Text
Encoded text to Uint8
Return from Lambda function.
Decode from Uint8 to text
Process readily as no escape characters.
Before, I was skipping step 2. And so Lambda was encoded the text however it does by default.
I am using an API to compile code, and when there is an error, the response containing the error message uses JSON escape characters, but when outputting it back into the HTML front-end, it just produces garbage characters. How can I either convert the escaped string to a plain text string using Javascript, or output it in HTML correctly?
This is what the string looks like properly outputted (in Powershell):
https://i.imgur.com/tv0BZFl.jpg
This is the escaped string:
\u001b[01m\u001b[K:\u001b[m\u001b[K In function '\u001b[01m\u001b[Kin...
This is what the string looks like if I directly output it in HTML:
[01m[K:[m[K In function '[01m[Kint main()[m[K':
[01m[K:9:1:[m[K [01;31m[Kerror: [m[Kexpected '[01m[K;[m[K' before '[01m[K}[m[K' token
}
[01;32m[K ^[m[K
Looks like you can use the strip-ansi package. Here's an example using your escaped string:
const stripAnsi = require('strip-ansi');
stripAnsi("\u001b[01m\u001b[K:\u001b[m\u001b[K In function '\u001b[01m\u001b[Kin...")
// result => ": In function 'in..."
If you aren't using node.js, or cannot use that package for whatever reason, this Stack Overflow answer has a regular expression you may be able to use instead.
Just found this tool too:
https://www.npmjs.com/package/ansi-to-html
which converts ANSI to html.
Let's say I have a string, called str, which is equal to "Hello, world!"
Is there a way to choose some unicode characters like "azertyuiopqsdfghjklmwxcvbn1234567890-" and return an encoded string that contains only the choosen characters?
It should return something like "hvfebi iehfhe" (well, something encoded and not human readable, but which is decodable)?
Thanks
There's no such a thing as a function that you configure an arbitrary set of characters to enconde and decode, unless you find a library that does that or you implement it yourself.
But, you can use base64 encoding, which uses "A-Z", "a-z", "0-9", "+", "/" and "=" characters to encode the string.
The native browser functions are on window: btoa() to enconde and atob() to decode.
Edit after your comments:
Any function you make up to solve this will be decodable anyway analysing the code, so no point in hiding it. If you don't want to be simply base64, you can make a function that encodes it several times.
I came across this strange JSON which I can't seem to decode.
To simplify things, let's say it's a JSON string:
"\uffffffe2\uffffff94\uffffff94\uffffffe2\uffffff94\uffffff80\uffffffe2\uffffff94\uffffff80 mystring"
After decoding it should look as following:
└── mystring
JS or PHP doesn't seem to convert it correctly.
js> JSON.parse('"\uffffffe2\uffffff94\uffffff94\uffffffe2\uffffff94\uffffff80\uffffffe2\uffffff94\uffffff80 mystring"')
ffe2ff94ff94ffe2ff94ff80ffe2ff94ff80 mystring
PHP behaves the same
php> json_decode('"\uffffffe2\uffffff94\uffffff94\uffffffe2\uffffff94\uffffff80\uffffffe2\uffffff94\uffffff80 mystring"')
ffe2ff94ff94ffe2ff94ff80ffe2ff94ff80 mystring
Any ideas how to properly parse this JSON string would be welcome.
It is not valid JSON string - JSON supports only 4 hex digits after \u. Results from both PHP and JS are correct.
It is not possible decode this using standard functions.
Where did you get this JSON string?
About correct json for string you want to get - it should be "\u2514\u2500\u2500 mystring", or just "└── mystring" (json supports any unicode characters in strings except " and \).
Also if you need to encode some character that require more than two bytes - it will result in two escape codes for example "𩄎" would be "\ud864\udd0e" when escaped.
So, If you really need to decode string above - you can fix it before decoding, replacing \uffffffe2 by \uffff\uffe2 via regexp (for js it would be something like: s.replace(/(\\u[A-Fa-f0-9]{4})([A-Fa-f0-9]{4})/gi,'$1\\u$2') ).
But anyway character codes in string specified above does not look right.
I use the following jquery code to load some date on a specific event from external file:
$("#container").load("/include/data.php?name=" + escape(name));
if the javascript "name" variable contains unicode characters it sends some encoded symbols to data.php file, something like this: %u10E1
How can I deal with this encoded symbols? I need to convert them back to readable one.
When I remove the escape function and leave just "name" variable the code doesn't work any more...
Can anyone please help?
If you want to do this manually, then you should be using encodeURIComponent, not escape (which is deprecated)
The jQuery way, however, would be:
$("#container").load("/include/data.php", { "name": name });
Either way PHP should decode it automatically when it populates $_GET.
This may help you.
javascript - how to convert unicode string to ascii