<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-11-23</periodOfReport>

    <issuer>
        <issuerCik>0000103884</issuerCik>
        <issuerName>ALEXANDERS J CORP</issuerName>
        <issuerTradingSymbol>JAX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001114862</rptOwnerCik>
            <rptOwnerName>STOUT LONNIE J II</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3401 WEST END AVENUE, SUITE 260</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NASHVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman, President &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Stock</value>
            </securityTitle>
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            </transactionDate>
            <transactionCoding>
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                <transactionCode>S</transactionCode>
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            </transactionCoding>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </transactionDate>
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                </natureOfOwnership>
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                </natureOfOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </transactionDate>
            <transactionCoding>
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                </transactionShares>
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                </transactionPricePerShare>
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            <postTransactionAmounts>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionDate>
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                <transactionPricePerShare>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                </natureOfOwnership>
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        </nonDerivativeTransaction>
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                </natureOfOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <natureOfOwnership>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionDate>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
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            </securityTitle>
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                    <value>4.00</value>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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                <transactionCode>S</transactionCode>
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                <transactionShares>
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                    <footnoteId id="F2"/>
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                    <value>4.10</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>199861</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10648.2525</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>J. Alexander's Corporation Employee Stock Ownership Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.10</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2009-11-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>160000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-11-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>160000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>160000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The option is scheduled to vest in four equal installments on November 23, 2010, 2011, 2012 and 2013.</footnote>
        <footnote id="F2">Sold pursuant to a Rule 10b5-1(c)(1) trading plan.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Mark A. Parkey, Attorney-in-Fact</signatureName>
        <signatureDate>2009-11-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0303
4
2009-11-23
0000103884
ALEXANDERS J CORP
JAX
0001114862
STOUT LONNIE J II
3401 WEST END AVENUE, SUITE 260
NASHVILLE
TN
37202
1
1
0
0
Chairman, President & CEO
Common Stock
2009-11-24
4
S
0
100
4.00
D
202114
D
Common Stock
2009-11-24
4
S
0
150
4.00
D
201964
D
Common Stock
2009-11-24
4
S
0
150
4.00
D
201814
D
Common Stock
2009-11-24
4
S
0
150
4.00
D
201664
D
Common Stock
2009-11-24
4
S
0
250
4.00
D
201414
D
Common Stock
2009-11-24
4
S
0
150
4.00
D
201264
D
Common Stock
2009-11-24
4
S
0
143
4.00
D
201121
D
Common Stock
2009-11-24
4
S
0
107
4.00
D
201014
D
Common Stock
2009-11-24
4
S
0
43
4.00
D
200971
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200921
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200871
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200821
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200771
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200721
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200671
D
Common Stock
2009-11-24
4
S
0
50
4.00
D
200621
D
Common Stock
2009-11-24
4
S
0
60
4.00
D
200561
D
Common Stock
2009-11-24
4
S
0
700
4.10
D
199861
D
Common Stock
10648.2525
I
J. Alexander's Corporation Employee Stock Ownership Plan
Employee Stock Option (Right to Buy)
4.10
2009-11-23
4
A
0
160000
0
A
2016-11-23
Common Stock
160000
160000
D
The option is scheduled to vest in four equal installments on November 23, 2010, 2011, 2012 and 2013.
Sold pursuant to a Rule 10b5-1(c)(1) trading plan.
Mark A. Parkey, Attorney-in-Fact
2009-11-25