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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-26</periodOfReport>

    <issuer>
        <issuerCik>0001316898</issuerCik>
        <issuerName>JAMBA, INC.</issuerName>
        <issuerTradingSymbol>JMBA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001259062</rptOwnerCik>
            <rptOwnerName>HEYER ANDREW R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MISTRAL CAPITAL MANAGEMENT, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>650 FIFTH AVENUE, 31ST FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10019</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10436</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>44133</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The securities reported in this column include 5,218 restricted stock units (&quot;RSUs&quot;) for Reporting Person's board service during fiscal year 2018 which give the Reporting Person a contingent right to receive at a future date one share of JMBA common stock for each restricted stock unit held.  The RSUs vest over a one year period in four equal installments, with 25% vesting on each three month period following the Company's 2018 annual stockholder meeting, or the date of the Company's 2019 annual stockholder meeting if the meeting is held before such date, subject to the Reporting Person's continued board service.</footnote>
        <footnote id="F2">The securities reported in this column include 5,218  shares of common stock issued for Reporting Person's board service during fiscal year 2017.</footnote>
        <footnote id="F3">The number of securities reported in this column includes 5,218 restricted stock units held by the Reporting Person as of the date of this filing.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Josh Nicosia, as attorney-in-fact for Andrew R. Heyer</signatureName>
        <signatureDate>2018-06-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
