My defaults for JSCS

.jscsrc

{
    "fileExtensions": [
        ".js"
    ],
    "disallowDanglingUnderscores": {
        "allExcept": ["_exception"]
    },
    "disallowEmptyBlocks": true,
    "disallowFunctionDeclarations": true,
    "disallowKeywords": [ "with", "eval" ],
    "disallowKeywordsOnNewLine": [ "else" ],
    "disallowMixedSpacesAndTabs": true,
    "disallowMultipleLineBreaks": true,
    "disallowMultipleLineStrings": true,
    "disallowMultipleVarDecl": true,
    "disallowNewlineBeforeBlockStatements": true,
    "disallowQuotedKeysInObjects": true,
    "disallowSpaceAfterObjectKeys": true,
    "disallowSpaceAfterPrefixUnaryOperators": [
        "++",
        "--",
        "+",
        "-",
        "~",
        "!"
    ],
    "disallowSpaceBeforePostfixUnaryOperators": [
        "++",
        "--"
    ],
    "disallowSpacesInCallExpression": true,
    "disallowSpacesInFunctionExpression": {
        "beforeOpeningRoundBrace": true
    },
    "disallowSpacesInsideArrayBrackets": true,
    "disallowSpacesInsideObjectBrackets": true,
    "disallowSpacesInsideParentheses": true,
    "disallowTrailingComma": true,
    "disallowTrailingWhitespace": true,
    "disallowYodaConditions": true,
    "maximumLineLength": 120,
    "requireAnonymousFunctions": true,
    "requireCamelCaseOrUpperCaseIdentifiers": true,
    "requireCapitalizedConstructors": true,
    "requireCommaBeforeLineBreak": true,
    "requireCurlyBraces": true,
    "requireLineFeedAtFileEnd": true,
    "requirePaddingNewLinesInObjects": true,
    "requireParenthesesAroundIIFE": true,
    "requireSpaceAfterBinaryOperators": true,
    "requireSpaceAfterKeywords": [
        "if",
        "else",
        "for",
        "while",
        "do",
        "switch",
        "return"
    ],
    "requireSpaceAfterLineComment": true,
    "requireSpaceBeforeBinaryOperators": true,
    "requireSpaceBeforeBlockStatements": true,
    "requireSpacesInAnonymousFunctionExpression": {
        "beforeOpeningCurlyBrace": true
    },
    "requireSpacesInConditionalExpression": {
        "afterTest": true,
        "beforeConsequent": true,
        "afterConsequent": true,
        "beforeAlternate": true
    },
    "requireSpacesInFunctionExpression": {
        "beforeOpeningCurlyBrace": true
    },
    "validateIndentation": 4,
    "validateLineBreaks": "LF",
    "validateParameterSeparator": ", ",
    "validateQuoteMarks": {
        "escape": true,
        "mark": "'"
    }
}