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Description:

jwt decoder

JWT Decoder #
This is a small library for decoding a json web token for dart / flutter. Since the header and payload is base64 encoded you can easily know the stored data with no password, you can also know if the token is expired or not.
If you like this library there's a version for Vue here. And for React here
Getting Started #
Decode a token
main () {
String yourToken = "Your JWT";
Map<String, dynamic> decodedToken = JwtDecoder.decode(yourToken);

/*
If the token has a valid format, you will get a Map<String, dynamic>
Your decoded token can look like:
{
"sub": "1234567890",
"name": "Gustavo",
"iat": 1516239022,
"exp": 1516239022,
"randomKey": "something else"
}
*/
}
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Know if the token is expired
main () {
String yourToken = "Your JWT";
bool hasExpired = JwtDecoder.isExpired(yourToken);

// You will get a true / false response
// true: if the token is already expired
// false: if the token is not expired
}
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Get expiration date
main () {
String yourToken = "Your JWT";
DateTime expirationDate = JwtDecoder.getExpirationDate(token);

// 2025-01-13 13:04:18.000
print(expirationDate);
}
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You can know how old your token is
// Token payload must include an 'iat' field
main () {
String yourToken = "Your JWT";
Duration tokenTime = JwtDecoder.getTokenTime(token);

// 15
print(tokenTime.inDays);
}
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License #
MIT