Error codes

The Simple-JWT-Login plugin has a separate error code for each error. Using this table, you will be able to find faster your problem.

Error Code	Message	Description
1	Key may not be empty	JWT is missing from request
2	Wrong number of segments	The JWT contains 3 parts, separated by dots(Header, Payload, Signature). So, your JWT does not have 2 dots in it.
3	Invalid header encoding	The encoding of the first part of the JWT, is invalid. This means, that the first part of your JWT is incorrect.
4	Invalid claims encoding	The second part of your JWT is invalid.
5	Invalid signature encoding	The signature that you provided in "JWT Decryption key" is invalid.
6	Empty algorithm	This means, that your JWT has no algorithm specified.
7	Algorithm not supported	The algorithm present in your JWT, is not supported by this plugin.
8	Algorithm not allowed	The provided algorithm is not allowed by this plugin.
9	'kid' invalid, unable to lookup correct key	Your JWT is malformed.
10	'kid' invalid, unable to lookup correct key	Your JWT is malformed.
11	Signature verification failed	Invalid "JWT Decryption key" provided in config.
12	Cannot handle token prior to ...	Check that this token has been created before 'now'. Timestamp verified from 'nbf'.
13	Cannot handle token prior to ...	Check that this token has been created before 'now'. This prevents. Timestamp verified from 'iat'.
14	Expired token	JWT is expired.
15	Algorithm not supported	Algorithm not supported when JWT was signed.
16	OpenSSL unable to sign data	Error while JWT is signed with OpenSSL.
17	Unsupported sign function	Invalid Algorithm provided for JWT when signing
18	Algorithm not supported	Invalid Algorithm while trying to verify the JWT
19	OpenSSL error	This is a generic OpenSSL error.
20	Null result with non-null input	Decoded JWT is null.
21	Null result with non-null input	Encoded JWT is null
22	Unknown JSON error	This is a generic error by JWT. More details are provided in the message.
23	Wrong Request.	JWT is missing in the auto-login process.
24	User not found.	This error occurs when the user is not found. For login and delete endpoint: there is no user in WordPress with the email or ID provided in JWT.
26	Auto-login is not enabled on this website.	You have to enable auto-login from plugin settings.
27	Invalid Auth Code provided.	The Auth code provided is invalid or missing. You should use one that you have saved in your plugin settings
28	This IP is not allowed to auto-login.	You can not auto-login from this IP. Some IP's are specified in plugin settings that can auto-login into WordPress
29	Unable to find property in JWT.	The user sub-key property can not be found in JWT
30	Unable to find property in JWT.	The user key property can not be found in JWT
31	Register is not allowed.	Register is disabled from settings
32	Invalid Auth Code	Invalid auth code provided on register endpoint. You can use auth codes that are generated in your plugin settings.
33	This IP is not allowed to register users.	You can not register users from this IP. The allowed IPs are saved in plugin settings
35	Missing email or password.	Missing email or password from your register new user request
36	Invalid email address.	The value provided for email is not a valid email.
37	This website does not allow users from this domain.	The email domain is not allowed to register to this WordPress. The allowed domains are saved in plugin settings.
38	User already exists.	The user that you are trying to create already exists. Try a different email address.
39	Delete is not enabled.	The plugin delete endpoint is not enabled for this website. This can be enabled from plugin settings.
40	Missing AUTH KEY	Missing Auth Key from Delete. You can find your generated auth keys in plugin settings.
41	You are not allowed to delete users from this IP	You can not delete users only from the IPs that are set in plugin settings.
42	The 'jwt' parameter is missing.	The JWT parameter is missing from the request.
43	Invalid method for this route.	The route that you are calling does not exist.
44	Invalid route name.	Route name is invalid.
45	Authentication is not enabled.	Authentication enabled is set to "No" in the plugin settings.
46	Autnentication missing email.	Your request does not contain the email address.
47	Authentication missing password.	Password is missing from the request.
48	Authentication wrong credentials	Email or password is incorrect.
49	JWT payload is not correct.	Check your JWT payload. After decoding it, it resulted null. it should be an JSON.
50	JWT is too old to be refreshed.	The JWT generated time is too old. You can not refresh this token.
51	JWT is missing from /auth/refresh	The JWT parameter was not sent to the /auth/refresh endpoint.
52	Unable to create user.	There was an error while trying to create the user.