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  • Authentication using JSON Web Token (jwt) in node.js

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    Authentication is one of the big part of any application. JSON web token is one of the safest medium of transferring information between two parties. The token is a long encryped string that has 3 parts-

     

    The headers  - It contains the header information

    The paylod - It contains the actual information such the user json object and

    The signature - It is a cryptographic signature

     


    Usage:

    jwt.sign(payload, secretOrPrivateKey, options, [callback])

    payload:

    {
        _id: "adnasdaasdjasdh",
        name: "dinesh rawat",
        email: "dinesh.rawat@evontech.com"
    }

    secretOrPrivateKey:

    It could be anything that is used to make a hash
    ex:-

    "mysupersecretkey"

    options:

    algorithm (default: HS256)

    expiresIn: expressed in seconds or a string describing a time span

    notBefore: expressed in seconds or a string describing a time span

    audience

    issuer

    jwtid

    subject

    noTimestamp

    header


    Example

    // sign with default (HMAC SHA256)
    var jwt = require('jsonwebtoken'); //Sign with HMAC SHA256
    var token = jwt.sign({
                    _id: "adnasdaasdjasdh",
                    name: "dinesh rawat",
                    email: "dinesh.rawat@evontech.com"
                }, "mysupersecretkey", { expiresIn : 60*60*24 });
    
    console.log(token);
    
    /*
    RESULT:
    -------
    
    eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI1Nzg3NTZlNTI3YjFjMGMzMzgyZWQ4ZWUiLCJlbWFpbCI6Imhhcm5lZXQiLCJ0b2tlbiI6IiIsImlhdCI6MTQ2ODU3NDQ3NiwiZXhwIjoxNDY4NjYwODc2fQ.tcvbLZIkLHWsKObtbDcpjHdGJoGnVtHinj8JAkRigpM
    
    


    Decoding:
     

    var decoded = jwt.decode(token);
    
    // get the decoded payload and header
    var decoded = jwt.decode(token, {complete: true});
    console.log(decoded.header);
    console.log(decoded.payload)

     

    Checkout code from git:

    https://github.com/dinesh-rawat/jwt-authentication.in.nodejs

     

     

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