How to check whether a string is Base64 encoded or not Except if you're trying to see if a char array with objects that only have toString()'s or multi-byte characters, in which case there's no other way to check except to make the string, and count characters the bytes make up, respectively. decodeURIComponent(decodeURIComponent(encod Here are more tests because I'm a completionist: Implementation from lodash library v4.0.0. When working with strings in JavaScript, you may want to check if a given string contains all values from a list of candidates. How to decode url-encoded string in javascript, Can't determine how data is being encoded, Decode url which has been encoded in javascript, Decode UTF16 encoded string (URL) in Java Script. Any concerns about executing URLDecoder against a URL that was not encoded? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why can clocks not be compared unless they are meeting? Do large language models know what they are talking about? Not reliably, especially in the case where a string may be encoded twice: In essence, if you were to try and detect the string encoding when the passed argument is not actually encoded but has qualities of an encoded string, you'd be decoding something you shouldn't. Adverb for when a person has never questioned something they believe. Why are lights very bright in most passenger trains, especially at night? You Assuming constant operation cost, are we guaranteed that computational complexity calculated from high level code is "correct"? How to get MIME type base64 encoded string in nodejs? To learn more, see our tips on writing great answers. It'll fail when where's something only partially encoded, like. How to check that byte array is Base64 encoded? So I know there is no query string like value="%..". @svth I remembered. No, the purpose of Base64 encoding is to ensure that binary information can safely be represented as ASCII charset (see here for more details). A java String is a list of characters. (If you see one, just fix it!). It is about encoding. If it doesn't differ, original isn't encoded. How can I determine whether a variable is a string or something else in JavaScript? If it throws an error, then the string is not base64 encoded. Use the parseInt () Function to Check Whether a Given String Is a Number or Not in JavaScript. Many times you don't even care about its type. These aren't questions about should the above work, the point is they do. So I give the point to him. Use the less-than and greater-than operators to compare strings: js. Not the answer you're looking for? Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? This solution has absolutely nothing to do with trying to determine which of escape() or encodeURIComponent() something has been encoded with.. If you really want to try to figure out exactly how something was encoded, you can try to look for some of the characters that escape() and encodeURI() do not encode. if ( str.match(/[_\. dmitri shostakovich vs Dimitri Schostakowitch vs Shostakovitch. It will be a simpler solution. Why are lights very bright in most passenger trains, especially at night? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. new String (Base64.getDecoder ().decode (inputStr), if (str.length % 8 === 0) { /* then ok */ }. It Do large language models know what they are talking about? In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? When did a Prime Minister last miss two, consecutive Prime Minister's Questions? I guess the point I was trying to make is that in a (JS) world where monkey patching is still common practice, relying on such technique is fraught with danger and one shouldn't expose themselves to it when the (simpler) alternative is guaranteed to always work (AFAIK you cannot monkey patch. I hope one can't write a quine in urlencode, or this algorithm would get stuck. Why did CJ Roberts apply the Fourteenth Amendment to Harvard, a private school? Just to expand on @DRAX's answer, I'd do this: It will account also for nulls and undefined types, and it will take care of non-string types, such as 0. isString() checks whether the passed argument is a string or not, using optional chaining and the latest standards: A code to have only string without any numbers, Than we can use isNaN(parseInt()) to have only the string. How do laws against computer intrusion handle the modern situation of devices routinely being under the de facto control of non-owners? Making statements based on opinion; back them up with references or personal experience. All characters are encoded. You are right of course. Plot multiple lines along with converging dotted line. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Detect whether JavasScript string has been encoded using encodeURIComponent. How do I distinguish between chords going 'up' and chords going 'down' when writing a harmony? What syntax could be used to implement both an exponentiation operator and XOR? Should I disclose my academic dishonesty on grad applications? Sometimes the extra, extreme clauses are just not worth the effort and the overhead. Since encodeURIComponent() uses UTF-8 encoding of characters >= 128, you can at the server side check for valid UTF-8 sequences. L, Below snippet presents differences between solutions. Developers use AI tools, they just dont trust them (Ep. Example: FWIW; Arguing against a solution because it could be broken by monkey-patching the Object prototype is a weak argument. No. Sometimes Base64 is used together with encryption: you first encrypt a message, then you encode it with Base64: because sending ASCII chars over a network is less complicated compared to sending arbitrary binary data. rev2023.7.3.43523. How is that different from Cody's answer, 4 years later? Validate string is base64 format using RegEx? I also found that this works fine too, and its a lot shorter than the other examples. In the first example, there is a function call to Object's toString method. Hello I am looking for a way to detect if a string has being encoded. To learn more, see our tips on writing great answers. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned, Check if all elements in array are strings. but that part of the specification is intended for JS engine programmers, and not people who write JS for use in browsers - in fact, I'd say it's safe to asume that within a web-browser, any-and-all JS string values will always be valid strings that can always be serialized out to UTF-8 and UTF-16, and also that JS scripts should not be concerned with the actual in-memory encoding of the string's content. @RafaWrzeszcz These libraries are fairly widely used and provide much useful (and tested) functionality. Confining signal using stitching vias on a 2 layer PCB. Does the DM need to declare a Natural 20? Is {toString:()=>('hello there')} a string? K rev2023.7.3.43523. Developers use AI tools, they just dont trust them (Ep. That is not knowable. WARNING: This is not a perfect solution. Now I am taking the value of the callBackUrl in my js method, then decoding it and firing window.open() with that decoded URL. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. That seems a bit expensive to me when compared with, I find this approach distasteful. To illustrate this more concretely, lets consider an OTel collector positioned at the output of a production environment, receiving a telemetry data stream produced by a How is that different from @Orwellophile's answer? Developers use AI tools, they just dont trust them (Ep. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Base32 uses A-Z and 2-7 for the encoding, and adds a padding character = to get a multiple of 8 characters, so you can create a regex to see if the candidate string I think you misunderstand what "UTF-8 characters" means; UTF-8 is an encoding of Unicode which can represent any character, glyph, and grapheme that is defined in the (ever growing) Unicode standard. Should I disclose my academic dishonesty on grad applications? Someone could easily alter all native prototypes and nothing would work anymore. Asking for help, clarification, or responding to other answers. Developers use AI tools, they just dont trust them (Ep. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned, How to detect if a string is encoded with escape() or encodeURIComponent(). See the tests: https://jsperf.com/isstringtype, I find this simple technique useful to type-check for String -, The same technique works for Number too -. Same problem as the accepted answer, and one that tempts additional poor design flaws, such as ignoring unknown exception types. But as said, the two example strings are pure ASCII, therefore decoding will not give you an error, and you always end up with result true. str = dec_str; Is 7 a string? Does "myVar instanceof String" do anything above and beyond "typeof myVar == 'string'" ? With respect to the HTML textboxes in your post, both the and elements in HTML only respect plaintext, so any RTF formatting will be automatically stripped when pasted by a user, hence why JS-heavy "rich-edit" and contenteditable components are notuncommon in web-applications, though in this answer I assume you're not using a rich-edit component in a web-page). Scottish idiom for people talking too much. yep - I run test multiple times in past - I also run It now - and you have right - now result for I is much better (I have 674M for "i") - I will update this (in free time) - thank you, @jwatkins - I update table with results - thanks for you comment :). Find centralized, trusted content and collaborate around the technologies you use most. Is there any political terminology for the leaders who behave like the agents of a bigger power? Connect and share knowledge within a single location that is structured and easy to search. It will just ignore non-base64 characters. How to check if entered TOTP secret key format is correct? how to give credit for a picture I modified from a scientific article? All of these comments are valid but, manonly with JS would the suggestion of using a third-party library to. I don't think it is possible, you can encode a string twice. List of candidates: WHITE_SPACE ,", < , > , { , } , | , \ , ^ , ~ , [ , ] , . In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Should i refrigerate or freeze unopened canned food items? well, true except of a case where "good enough" is enough; if the 0.01% of users really want the program not to work, it won't work for them. JS supports monkey patching, so it's possible to re-define the. Not the answer you're looking for? I'm passing a URL as the url encrypted string, so I did an REFind(':', str) and it returns 6 (https:) whether the string is encrypted or not. The test link is dead, but I believe you. Connect and share knowledge within a single location that is structured and easy to search. IMHO this should be, if not the most upvoted answer, at least the most upvoted comment on the current leading answer. @BenjaminGruenbaum I came looking for the answer to the OP's question, and didn't like any of the answers. To learn more, see our tips on writing great answers. But since you either have to check if the character was encoded or not then you should use a meta data flag to keep it in check. A What are the pros and cons of allowing keywords to be abbreviated? Comparing strings. <a href="https://stackoverflow.com/questions/1275948/how-to-detect-if-a-string-is-encoded-with-escape-or-encodeuricomponent">javascript - How to detect if a string is encoded with </a> Asking for help, clarification, or responding to other answers. @JonathanH - if you look at the edit history of Orwellophile's answer, at the time. What are the pros and cons of allowing keywords to be abbreviated? Thanks for contributing an answer to Stack Overflow! @SF. Java: url encoding leaving 'allowed' character intact, Java difference between two URL Encoded strings, URL Encoding Strings that aren't valid URIs, Java getting url with the correct encoding, String url-encoded twice, I can't get the initial string. D Take the initial string and compare it with the result of decoding it. <a href="https://futurestud.io/tutorials/check-if-a-string-includes-all-strings-in-javascript-or-node-js">Check If a String Includes All Strings in </a> You can use this function to determine the type of anything: https://codepen.io/patodiblasi/pen/NQXPwY?editors=0012. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For example, we can check to see if it ends with a Is there a way to detect the encoding used to escape the data? @DamaRamesh See my update, I added a link to another existing question that should answer that part. Attention! Find centralized, trusted content and collaborate around the technologies you use most. Why did only Pinchas (knew how to) respond? But I could not figure out any way to validate if the string is already base64 format. I don't know for input parameters, what will they be - encoded or not, so I have to know if I have to encode or decode them before search. If the data contains invalid UTF-8 sequences the data has been produced with escape() and you probably have to assume it is ISO-8859-1 encoded. How do laws against computer intrusion handle the modern situation of devices routinely being under the de facto control of non-owners? Then why does /\d/.test(7) work? But, checking for Array is a bit different -, This technique does not work for Functions however -, Works for both string literals let s = 'blah' and for Object Strings let s = new String('blah'). Does this change how I list it on my CV? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Awesome! This won't work as expected in the case of strings created with new String(), but this is seldom used and recommended against[1][2]. Hello I am looking for a way to detect if a string has being encoded. Comic about an AI that equips its robot soldiers with spears and swords. I'm going to agree with Rafal. Now you can split that nasty hair between null & 0! Not the answer you're looking for? @ling Just curious, why do you put parenthesis around. Each of these has been constructed by its appropriate class function, like "new Object()" etc. This code is just a character corruption bug. Making statements based on opinion; back them up with references or personal experience. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. The range 0x20-0x7E works because Unicode's first 127 codepoints are identical to ASCII and can be seen here: http://www.asciitable.com/. But still it says nothing about whether the newly decoded version isn't still encoded. In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? The argument against it is that it 'fails' for object-wrapped strings like. Why can clocks not be compared unless they are meeting? Thanks for contributing an answer to Stack Overflow! Valid base64 strings are a subset of all plain-text strings. Reliably checking if a string is base64 encoded in .Net, How to check if a string is plaintext or base64 format in Node.js. Hope this helps. But you can try encoding it back to base64 and compare the result with the original string: This check will tell whether str is pure base64 or not. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Making statements based on opinion; back them up with references or personal experience. I am able to encode a plain text to base64 format and reverse it. How to check if a input string is encoded or not? Circle and arrow on a single term of a math equation - arrow up and down, dmitri shostakovich vs Dimitri Schostakowitch vs Shostakovitch. Difference between machine language and machine code, maybe in the C64 community? I have encoded parameters saved, and I need to search for them. } This is worng. When are you supposed to use escape instead of encodeURI / encodeURIComponent? You can use String.prototype.toWellFormed(), which replaces lone surrogates with the Unicode replacement character (U+FFFD), to avoid this error. </div> </div> <div class="fusion-footer"> <footer class="fusion-footer-widget-area fusion-widget-area"> <div class="fusion-row"> <a href="https://4bathletics.us/nordictrack-bike/eso-non-core-combat-abilities">Eso Non Core Combat Abilities</a>, <a href="https://4bathletics.us/nordictrack-bike/what-is-strategic-planning-in-hrm">What Is Strategic Planning In Hrm</a>, <a href="https://4bathletics.us/nordictrack-bike/sitemap_c.html">Articles C</a><br> </div> </footer> <footer class="fusion-footer-copyright-area" id="footer"> <div class="fusion-row"> <div class="fusion-copyright-content"> <div class="fusion-copyright-notice"> <div>check if string is encoded javascript 2023</div> </div> </div> </div> </footer> </div> </div> </body> </html>