JSHint configuration as of v2.8.0 - Strict Settings with some exceptions made. Settings marked as depreciated were *not* included in order to futureproof for newer versions.

.jshintrc

{
    // --------------------------------------------------------------------
    // JSHint Configuration, Strict Edition
    // --------------------------------------------------------------------
    //
    // This is a options template for JSHint[1], using JSHint example[2],
    // Ory Band's example[3], and haschek's example[4] as basis and setting
    // config values to be most strict:
    //
    // * set all enforcing options to true
    // * set all relaxing options to false
    // * set all environment options to false, except the browser value
    // * set all JSLint legacy options to false
    //
    // NOTE: Certain exceptions were made for my own use. Understand what each
    //       deviation from what is described just above means for your project
    //
    // [1]: http://www.jshint.com/
    // [2]: https://github.com/jshint/jshint/blob/master/examples/.jshintrc
    // [3]: https://github.com/oryband/dotfiles/blob/master/.jshintrc
    //
    // @author http://michael.haschke.biz/
    // @author Michael Scheer <Michael.Scheer@hcahealthcare.com>
    // @license http://unlicense.org/
    //
    //
    // *******************
    // NOTE: Modifications have been made to the original script found at:
    //       https://gist.github.com/haschek/2595796
    //       These modifications remove depreciated options and adding new
    //       ones as of v2.8.0
    // *******************
    //
    //
    // == Enforcing Options ===============================================
    //
    // These options tell JSHint to be more strict towards your code. Use
    // them if you want to allow only a safe subset of JavaScript, very
    // useful when your codebase is shared with a big number of developers
    // with different skill levels.

    "bitwise"       : true,     // Prohibit bitwise operators (&, |, ^, etc.).
    "curly"         : true,     // Require { for every new block or scope.
    "eqeqeq"        : true,     // Require triple equals i.e. `===`.
    "es3"           : false,     // adhere to ECMAScript 3 specification -- Unneeded now and conflicts with promises
    "es5"           : true,     // enables syntax first defined in the ECMAScript 5.1 specification.
    "forin"         : true,     // Tolerate `for in` loops without `hasOwnPrototype`.
    "freeze"        : true,     // Prohibits overwriting prototypes of native objects such as Array, Date and so on.
    "funcscope"     : false,    // This option suppresses warnings about declaring variables inside of control structures while accessing them later from the outside.
    "futurehostile" : true,     // This option enables warnings about the use of identifiers which are defined in future versions of JavaScript.
    "globals"       : true,     //
    "iterator"      : false,    // This option suppresses warnings about the __iterator__ property. This property is not supported by all browsers so use it carefully.
    "latedef"       : true,     // Prohibit variable use before definition.
    "maxcomplexity" : 10,       // Lets you control cyclomatic complexity throughout your code
    "maxdepth"      : 5,        // Lets you control how nested do you want your blocks to be
    "maxerr"        : 20,       // Set the maximum amount of warnings JSHint will produce before giving up. Default is 50.
    "maxparams"     : 4,        // Set the max number of formal parameters allowed per function
    "maxstatements" : 50,       // Set the max number of statements allowed per function:
    "noarg"         : true,     // Prohibit use of `arguments.caller` and `arguments.callee`.
    "nocomma"       : true,     // Prohibits the use of the comma operator.
    "nonbsp"        : true,     // Warns about "non-breaking whitespace" characters.
    "nonew"         : true,     // Prohibit use of constructors for side-effects.
    "notypeof"      : false,    // suppresses warnings about invalid typeof operator values.
    "shadow"        : false,    // suppresses warnings about variable shadowing
    "singleGroups"  : true,    // This option prohibits the use of the grouping operator when it is not strictly required.
    "strict"        : true,     // Require `use strict` pragma in every file.
    "undef"         : true,     // Prohibits the use of explicitly undeclared variables.
    "unused"        : true,     // warns when you define and never use your variables.
    "varstmt"       : false,     // the use of VariableStatements are forbidden

    // == Relaxing Options ================================================
    //
    // These options allow you to suppress certain types of warnings. Use
    // them only if you are absolutely positive that you know what you are
    // doing.
    // ====================================================================

    "asi"           : false,    // Tolerate Automatic Semicolon Insertion (no semicolons).
    "boss"          : false,    // Tolerate assignments inside if, for & while. Usually conditions & loops are for comparison, not assignments.
    "debug"         : false,    // Allow debugger statements e.g. browser breakpoints.
    "eqnull"        : false,    // Tolerate use of `== null`.
    "es5"           : false,    // Allow EcmaScript 5 syntax.
    "esnext"        : true,     // Allow ES.next specific features such as `const` and `let`.
    "evil"          : false,    // Tolerate use of `eval`.
    "expr"          : false,    // Tolerate `ExpressionStatement` as Programs.
    "funcscope"     : false,    // Tolerate declarations of variables inside of control structures while accessing them later from the outside.
    "globalstrict"  : false,    // Allow global "use strict" (also enables 'strict').
    "iterator"      : false,    // Allow usage of __iterator__ property.
    "lastsemic"     : false,    // Tolerat missing semicolons when the it is omitted for the last statement in a one-line block.
    "loopfunc"      : false,    // Allow functions to be defined within loops.
    "onecase"       : false,    // Tolerate switches with just one case.
    "proto"         : false,    // Tolerate __proto__ property. This property is deprecated.
    "regexdash"     : false,    // Tolerate unescaped last dash i.e. `[-...]`.
    "scripturl"     : false,    // Tolerate script-targeted URLs.
    "smarttabs"     : false,    // Tolerate mixed tabs and spaces when the latter are used for alignmnent only.
    "shadow"        : false,    // Allows re-define variables later in code e.g. `var x=1; x=2;`.
    "supernew"      : false,    // Tolerate `new function () { ... ;` and `new Object;`.
    "validthis"     : false,    // Tolerate strict violations when the code is running in strict mode and you use this in a non-constructor function.

    // == Environments ====================================================
    //
    // These options pre-define global variables that are exposed by
    // popular JavaScript libraries and runtime environments—such as
    // browser or node.js.
    // ====================================================================

    "mocha"         : true,     // Mocha testing suite
    "browser"       : true,     // Standard browser globals e.g. `window`, `document`.
    "couch"         : false,    // Enable globals exposed by CouchDB.
    "devel"         : false,    // Allow development statements e.g. `console.log();`.
    "dojo"          : false,    // Enable globals exposed by Dojo Toolkit.
    "jquery"        : false,    // Enable globals exposed by jQuery JavaScript library.
    "mootools"      : false,    // Enable globals exposed by MooTools JavaScript framework.
    "node"          : true,     // Enable globals available when code is running inside of the NodeJS runtime environment.
    "nonstandard"   : false,    // Define non-standard but widely adopted globals such as escape and unescape.
    "prototypejs"   : false,    // Enable globals exposed by Prototype JavaScript framework.
    "rhino"         : false,    // Enable globals available when your code is running inside of the Rhino runtime environment.
    "wsh"           : false,    // Enable globals available when your code is running as a script for the Windows Script Host.

    // == Undocumented Options ============================================
    //
    // While I've found these options in [example1][2] and [example2][3]
    // they are not described in the [JSHint Options documentation][4].
    //
    // [4]: http://www.jshint.com/options/
    // ====================================================================

    "predef"        : [         // Extra globals.
        //"exampleVar",
        //"anotherCoolGlobal",
        //"iLoveDouglas"
    ],
    "indent"        : 4         // Specify indentation spacing
}

This file is JSON, which doesn't support comments. The error is because of the first / in the file, which is an illegal token.

Try the less informative but de-commented and de-duped, no-deprecated-options for 2.9 => https://gist.github.com/michaelsanford/57d1c624cf7414ebf1a61eb1074bd474