blocks|key|2861991|text|有一个快速的实现。如果您使用的是CocoaPods，请将其添加到您的Podfile中，或者克隆项目并直接使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2861992|JSONWebToken|offset|length|2861993|do+{
++//+the+token+that+will+be+decoded
++let+token+=+"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ"
++let+payload+=+try+JWT.decode(token,+algorithm:+.hs256("secret".data(using:+.utf8)!))
++print(payload)
}+catch+{
++print("Failed+to+decode+JWT:+\(error)")
}|code-block|syntax|javascript|2861994|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/kylef/JSONWebToken.swift^0|0|0|C|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

There's a swift implementation. Add this into your Podfile if you're using CocoaPods or clone the project and use it directly.

<a href="https://github.com/kylef/JSONWebToken.swift" rel="nofollow">JSONWebToken</a>

<pre><code>do {
 // the token that will be decoded
 let token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ"
 let payload = try JWT.decode(token, algorithm: .hs256("secret".data(using: .utf8)!))
 print(payload)
} catch {
 print("Failed to decode JWT: \(error)")
}
</code></pre>

blocks|key|109903|text|如果你可以使用一个库，我建议你使用这个https://github.com/auth0/JWTDecode.swift|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|109904|然后导入库import+JWTDecode并执行。|style|CODE|109905|let+jwt+=+try+decode(jwt:+token)|code-block|syntax|javascript|109906|109907|因为您不想包含这个库，所以我拿出了使其正常工作所需的部分。|109908|func+decode(jwtToken+jwt:+String)+->+[String:+Any]+{
++let+segments+=+jwt.components(separatedBy:+".")
++return+decodeJWTPart(segments[1])+??+[:]
}

func+base64UrlDecode(_+value:+String)+->+Data?+{
++var+base64+=+value
++++.replacingOccurrences(of:+"-",+with:+"%2B")
++++.replacingOccurrences(of:+"_",+with:+"/")

++let+length+=+Double(base64.lengthOfBytes(using:+String.Encoding.utf8))
++let+requiredLength+=+4+*+ceil(length+/+4.0)
++let+paddingLength+=+requiredLength+-+length
++if+paddingLength+>+0+{
++++let+padding+=+"".padding(toLength:+Int(paddingLength),+withPad:+"=",+startingAt:+0)
++++base64+=+base64+%2B+padding
++}
++return+Data(base64Encoded:+base64,+options:+.ignoreUnknownCharacters)
}

func+decodeJWTPart(_+value:+String)+->+[String:+Any]?+{
++guard+let+bodyData+=+base64UrlDecode(value),
++++let+json+=+try?+JSONSerialization.jsonObject(with:+bodyData,+options:+[]),+let+payload+=+json+as?+[String:+Any]+else+{
++++++return+nil
++}

++return+payload
}|109909|这样叫它：|109910|decode(jwtToken:+TOKEN)|109911|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/auth0/JWTDecode.swift^0|J|14|0|0|5|G|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|D|3|E|5|6|7|17|8|@$A|18|B|19|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1C|8|@]|9|@]|C|$]]|$1|P|3|Q|5|J|7|1D|8|@]|9|@]|C|$K|L]]|$1|R|3|S|5|6|7|1E|8|@]|9|@]|C|$]]|$1|T|3|U|5|J|7|1F|8|@]|9|@]|C|$K|L]]|$1|V|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|W|$X|$5|Y|Z|10|C|$11|12]]]]

If you are okay with using a library i would suggest this <a href="https://github.com/auth0/JWTDecode.swift" rel="noreferrer">https://github.com/auth0/JWTDecode.swift</a>

and then import the library <code>import JWTDecode</code> and execute.

<pre><code>let jwt = try decode(jwt: token)
</code></pre>

<hr>

Since you didn't want to include this library i brought out the needed parts to make it work.

<pre><code>func decode(jwtToken jwt: String) -&gt; [String: Any] {
 let segments = jwt.components(separatedBy: ".")
 return decodeJWTPart(segments[1]) ?? [:]
}

func base64UrlDecode(_ value: String) -&gt; Data? {
 var base64 = value
 .replacingOccurrences(of: "-", with: "+")
 .replacingOccurrences(of: "_", with: "/")

 let length = Double(base64.lengthOfBytes(using: String.Encoding.utf8))
 let requiredLength = 4 * ceil(length / 4.0)
 let paddingLength = requiredLength - length
 if paddingLength &gt; 0 {
 let padding = "".padding(toLength: Int(paddingLength), withPad: "=", startingAt: 0)
 base64 = base64 + padding
 }
 return Data(base64Encoded: base64, options: .ignoreUnknownCharacters)
}

func decodeJWTPart(_ value: String) -&gt; [String: Any]? {
 guard let bodyData = base64UrlDecode(value),
 let json = try? JSONSerialization.jsonObject(with: bodyData, options: []), let payload = json as? [String: Any] else {
 return nil
 }

 return payload
}
</code></pre>

Call it like this:

<pre><code>decode(jwtToken: TOKEN)
</code></pre>

blocks|key|2650713|text|我已经有了这个问题的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650714|+static+func+getJwtBodyString(tokenstr:+String)+->+NSString+{

++++var+segments+=+tokenstr.components(separatedBy:+".")
++++var+base64String+=+segments[1]
++++print("\(base64String)")
++++let+requiredLength+=+Int(4+*+ceil(Float(base64String.characters.count)+/+4.0))
++++let+nbrPaddings+=+requiredLength+-+base64String.characters.count
++++if+nbrPaddings+>+0+{
++++++++let+padding+=+String().padding(toLength:+nbrPaddings,+withPad:+"=",+startingAt:+0)
++++++++base64String+=+base64String.appending(padding)
++++}
++++base64String+=+base64String.replacingOccurrences(of:+"-",+with:+"%2B")
++++base64String+=+base64String.replacingOccurrences(of:+"_",+with:+"/")
++++let+decodedData+=+Data(base64Encoded:+base64String,+options:+Data.Base64DecodingOptions(rawValue:+UInt(0)))
++//++var+decodedString+:+String+=+String(decodedData+:+nsdata+as+Data,+encoding:+String.Encoding.utf8)

++++let+base64Decoded:+String+=+String(data:+decodedData!+as+Data,+encoding:+String.Encoding(rawValue:+String.Encoding.utf8.rawValue))!
++++print("\(base64Decoded)")
++++return+base64String+as+NSString
}|code-block|syntax|javascript|2650715|这对我来说很有效。谢谢。|2650716|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I have got the solution for this. 

<pre><code> static func getJwtBodyString(tokenstr: String) -&gt; NSString {

 var segments = tokenstr.components(separatedBy: ".")
 var base64String = segments[1]
 print("\(base64String)")
 let requiredLength = Int(4 * ceil(Float(base64String.characters.count) / 4.0))
 let nbrPaddings = requiredLength - base64String.characters.count
 if nbrPaddings &gt; 0 {
 let padding = String().padding(toLength: nbrPaddings, withPad: "=", startingAt: 0)
 base64String = base64String.appending(padding)
 }
 base64String = base64String.replacingOccurrences(of: "-", with: "+")
 base64String = base64String.replacingOccurrences(of: "_", with: "/")
 let decodedData = Data(base64Encoded: base64String, options: Data.Base64DecodingOptions(rawValue: UInt(0)))
 // var decodedString : String = String(decodedData : nsdata as Data, encoding: String.Encoding.utf8)

 let base64Decoded: String = String(data: decodedData! as Data, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))!
 print("\(base64Decoded)")
 return base64String as NSString
}
</code></pre>

This works for me great. Thank you.

blocks|key|2650718|text|++++func+decode(_+token:+String)+->+[String:+AnyObject]?+{
++++let+string+=+token.components(separatedBy:+".")
++++let+toDecode+=+string[1]+as+String


++++var+stringtoDecode:+String+=+toDecode.replacingOccurrences(of:+"-",+with:+"%2B")+//+62nd+char+of+encoding
++++stringtoDecode+=+stringtoDecode.replacingOccurrences(of:+"_",+with:+"/")+//+63rd+char+of+encoding
++++switch+(stringtoDecode.utf16.count+%25+4)+{
++++case+2:+stringtoDecode+=+"\(stringtoDecode)=="
++++case+3:+stringtoDecode+=+"\(stringtoDecode)="
++++default:+//+nothing+to+do+stringtoDecode+can+stay+the+same
++++++++print("")
++++}
++++let+dataToDecode+=+Data(base64Encoded:+stringtoDecode,+options:+[])
++++let+base64DecodedString+=+NSString(data:+dataToDecode!,+encoding:+String.Encoding.utf8.rawValue)

++++var+values:+[String:+AnyObject]?
++++if+let+string+=+base64DecodedString+{
++++++++if+let+data+=+string.data(using:+String.Encoding.utf8.rawValue,+allowLossyConversion:+true)+{
++++++++++++values+=+try!+JSONSerialization.jsonObject(with:+data,+options:+JSONSerialization.ReadingOptions.allowFragments)+as?+[String+:+AnyObject]
++++++++}
++++}
++++return+values
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2650719|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> func decode(_ token: String) -&gt; [String: AnyObject]? {
 let string = token.components(separatedBy: ".")
 let toDecode = string[1] as String


 var stringtoDecode: String = toDecode.replacingOccurrences(of: "-", with: "+") // 62nd char of encoding
 stringtoDecode = stringtoDecode.replacingOccurrences(of: "_", with: "/") // 63rd char of encoding
 switch (stringtoDecode.utf16.count % 4) {
 case 2: stringtoDecode = "\(stringtoDecode)=="
 case 3: stringtoDecode = "\(stringtoDecode)="
 default: // nothing to do stringtoDecode can stay the same
 print("")
 }
 let dataToDecode = Data(base64Encoded: stringtoDecode, options: [])
 let base64DecodedString = NSString(data: dataToDecode!, encoding: String.Encoding.utf8.rawValue)

 var values: [String: AnyObject]?
 if let string = base64DecodedString {
 if let data = string.data(using: String.Encoding.utf8.rawValue, allowLossyConversion: true) {
 values = try! JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String : AnyObject]
 }
 }
 return values
}
</code></pre>

blocks|key|107620|text|在Viktor的代码上迭代：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107621|107622|不确定为什么会有替代品--并且_在我的任何令牌中都看不到。如果传递了错误的token或其他填充的errors.|unordered-list-item|107623|Simpler计算和填充函数的利用率，|107624|使用嵌套函数来保留更多的modular|107625|Utilize异常。|107626|107627|希望它是有用的：|107628|func+decode(jwtToken+jwt:+String)+throws+->+[String:+Any]+{

++++enum+DecodeErrors:+Error+{
++++++++case+badToken
++++++++case+other
++++}

++++func+base64Decode(_+base64:+String)+throws+->+Data+{
++++++++let+padded+=+base64.padding(toLength:+((base64.count+%2B+3)+/+4)+*+4,+withPad:+"=",+startingAt:+0)
++++++++guard+let+decoded+=+Data(base64Encoded:+padded)+else+{
++++++++++++throw+DecodeErrors.badToken
++++++++}
++++++++return+decoded
++++}

++++func+decodeJWTPart(_+value:+String)+throws+->+[String:+Any]+{
++++++++let+bodyData+=+try+base64Decode(value)
++++++++let+json+=+try+JSONSerialization.jsonObject(with:+bodyData,+options:+[])
++++++++guard+let+payload+=+json+as?+[String:+Any]+else+{
++++++++++++throw+DecodeErrors.other
++++++++}
++++++++return+payload
++++}

++++let+segments+=+jwt.components(separatedBy:+".")
++++return+try+decodeJWTPart(segments[1])
++}|code-block|syntax|javascript|107629|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|10|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|12|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|13|8|@]|9|@]|A|$R|S]]|$1|T|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|U|$]]

Iterating on Viktor's code: 

<ul>
<li>Wasn't sure why there were replacements for - and _
did not see that in any of my tokens. </li>
<li>Use nested functions to keep more modular</li>
<li>Utilize exceptions if bad token passed or other errors.</li>
<li>Simpler calculation of padding and utilization of padding function. </li>
</ul>

Hope it is useful:

<pre><code>func decode(jwtToken jwt: String) throws -&gt; [String: Any] {

 enum DecodeErrors: Error {
 case badToken
 case other
 }

 func base64Decode(_ base64: String) throws -&gt; Data {
 let padded = base64.padding(toLength: ((base64.count + 3) / 4) * 4, withPad: "=", startingAt: 0)
 guard let decoded = Data(base64Encoded: padded) else {
 throw DecodeErrors.badToken
 }
 return decoded
 }

 func decodeJWTPart(_ value: String) throws -&gt; [String: Any] {
 let bodyData = try base64Decode(value)
 let json = try JSONSerialization.jsonObject(with: bodyData, options: [])
 guard let payload = json as? [String: Any] else {
 throw DecodeErrors.other
 }
 return payload
 }

 let segments = jwt.components(separatedBy: ".")
 return try decodeJWTPart(segments[1])
 }
</code></pre>

blocks|key|110351|text|如果你想使用一个库，我建议你使用一些大人物提供的流行的库。IBM正在制作Kitura+-+Swift后端框架，因此JWT的编码和解码实现必须是一流的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110352|链接：https://github.com/IBM-Swift/Swift-JWT|offset|length|110353|110354|import+SwiftJWT

struct+Token:+Decodable+{
++++let+jwtString:+String

++++func+abc()+{

++++++++do+{
++++++++++++let+newJWT+=+try+JWT<MyJWTClaims>(jwtString:+jwtString)
++++++++++++print(newJWT.claims.exp)
++++++++}+catch+{
++++++++++++print("OH+NOES")
++++++++}


++++}
}

struct+MyJWTClaims:+Claims+{
++++let+exp:+Date
}|code-block|syntax|javascript|110355|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/IBM-Swift/Swift-JWT^0|0|3|12|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Z|8|@]|9|@]|A|$J|K]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I you want to use a library for that I recommend using something popular from someone big. IBM is making Kitura – Swift backend framework, so the implementation of encoding and decoding JWT for it must be top notch:

Link:
<a href="https://github.com/IBM-Swift/Swift-JWT" rel="nofollow noreferrer">https://github.com/IBM-Swift/Swift-JWT</a>

Simple usage for token with expiry date

<pre><code>import SwiftJWT

struct Token: Decodable {
 let jwtString: String

 func abc() {

 do {
 let newJWT = try JWT&lt;MyJWTClaims&gt;(jwtString: jwtString)
 print(newJWT.claims.exp)
 } catch {
 print("OH NOES")
 }


 }
}

struct MyJWTClaims: Claims {
 let exp: Date
}
</code></pre>

blocks|key|107880|text|Objective-C版本的老版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107881|NSLog(@"credential+is+%25@",+credential.identityToken);
NSString+*+string+=+[[NSString+alloc]+initWithData:credential.identityToken+encoding:NSUTF8StringEncoding];
NSArray+*+segments+=+[string+componentsSeparatedByString:@"."];
NSMutableDictionary+*+JSON+=+[NSMutableDictionary+new];
for+(int+n+=+0;+n+<+segments.count;+n%2B%2B){
++++
++++NSString+*+value+=+segments[n];
++++NSString+*+base64+=+[value+stringByReplacingOccurrencesOfString:@"-"+withString:@"%2B"];
++++base64+=+[base64+stringByReplacingOccurrencesOfString:@"_"+withString:@"/"];
++++NSUInteger+length+=+[base64+lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
++++int+requiredLength+=+4+*+ceil((float)length/4.0f);
++++int+paddingLength+=+requiredLength+-+(int)length;
++++for+(int+n+=+0;+n+<+paddingLength;+n%2B%2B){
++++++++base64+=+[base64+stringByAppendingString:@"="];
++++}
++++NSData+*+data+=+[[NSData+alloc]+initWithBase64EncodedString:base64+options:0];
++++
++++NSError+*+error;
++++NSDictionary+*+local+=+[NSJSONSerialization+JSONObjectWithData:data
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++options:NSJSONReadingAllowFragments
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++error:&error];
++++[JSON+addEntriesFromDictionary:local];
}

NSLog(@"JSON+is+%25@",+JSON);|code-block|syntax|javascript|107882|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Objective-C version for oldies:
<pre><code>NSLog(@&quot;credential is %@&quot;, credential.identityToken);
NSString * string = [[NSString alloc] initWithData:credential.identityToken encoding:NSUTF8StringEncoding];
NSArray * segments = [string componentsSeparatedByString:@&quot;.&quot;];
NSMutableDictionary * JSON = [NSMutableDictionary new];
for (int n = 0; n &lt; segments.count; n++){
 
 NSString * value = segments[n];
 NSString * base64 = [value stringByReplacingOccurrencesOfString:@&quot;-&quot; withString:@&quot;+&quot;];
 base64 = [base64 stringByReplacingOccurrencesOfString:@&quot;_&quot; withString:@&quot;/&quot;];
 NSUInteger length = [base64 lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
 int requiredLength = 4 * ceil((float)length/4.0f);
 int paddingLength = requiredLength - (int)length;
 for (int n = 0; n &lt; paddingLength; n++){
 base64 = [base64 stringByAppendingString:@&quot;=&quot;];
 }
 NSData * data = [[NSData alloc] initWithBase64EncodedString:base64 options:0];
 
 NSError * error;
 NSDictionary * local = [NSJSONSerialization JSONObjectWithData:data
 options:NSJSONReadingAllowFragments
 error:&amp;error];
 [JSON addEntriesFromDictionary:local];
}

NSLog(@&quot;JSON is %@&quot;, JSON);
</code></pre>

I have a JWT token like this

<blockquote>
 eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ
</blockquote>

How can I decode this so that I can get the payload like this

<blockquote>
 { "sub": "1234567890", "name": "John Doe", "admin": true }
</blockquote>

How can I decode JWT (JSON web token) token in Swift?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个这样的JWT令牌 eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7H...

问如何在Swift中解码JWT (JSON web token)令牌？
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问如何在Swift中解码JWT (JSON web token)令牌？
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