Using PassportJS, how does one pass additional form fields to the local authentication strategy?

There's a passReqToCallback option that you can enable, like so:

passport.use(new LocalStrategy(  {usernameField: 'email', passReqToCallback: true},  function(req, email, password, done) {    // now you can check req.body.foo  }));

When, set req becomes the first argument to the verify callback, and you can inspect it as you wish.

In most common cases we need to provide 2 options for login

• with email
• with mobile

Its simple , we can take common filed username and query $or by two options , i posted following snippets,if some one have have same question .

We can also use 'passReqToCallback' is best option too , thanks @Jared Hanson

passport.use(new LocalStrategy({    usernameField: 'username', passReqToCallback: true}, async (req, username, password, done) => {    try {        //find user with email or mobile        const user = await Users.findOne({ $or: [{ email: username }, { mobile: username }] });        //if not handle it        if (!user) {            return done(null, {                status: false,                message: "That e-mail address or mobile doesn't have an associated user account. Are you sure you've registered?"            });        }        //match password        const isMatch = await user.isValidPassword(password);        debugger        if (!isMatch) {            return done(null, {                status: false,                message: "Invalid username and password."            })        }        //otherwise return user        done(null, {            status: true,            data: user        });    } catch (error) {        done(error, {            status: false,            message: error        });    }}));