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.TH "MONGOEXPORT" "1" "Jun 21, 2018" "4.0" "mongodb-manual"
.SH NAME
mongoexport \- MongoDB Export Utility
.
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.SS On this page
.INDENT 0.0
.IP \(bu 2
\fI\%Synopsis\fP
.IP \(bu 2
\fI\%Considerations\fP
.IP \(bu 2
\fI\%Required Access\fP
.IP \(bu 2
\fI\%Read Preference\fP
.IP \(bu 2
\fI\%Options\fP
.IP \(bu 2
\fI\%Use\fP
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.IP "Mac OSX Sierra and Go 1.6 Incompatibility"
.sp
Users running on Mac OSX Sierra require the 3.2.10 or newer version
of  mongoexport\&.
.UNINDENT
.UNINDENT
.SH SYNOPSIS
.sp
\fI\%mongoexport\fP is a utility that produces a JSON or CSV export
of data stored in a MongoDB instance.
.sp
See the mongoimport document for more
information regarding the \fBmongoimport\fP utility, which
provides the inverse “importing” capability.
.sp
Run \fI\%mongoexport\fP from the system command line, not the \fBmongo\fP shell.
.SH CONSIDERATIONS
.sp
\fBWARNING:\fP
.INDENT 0.0
.INDENT 3.5
Avoid using \fBmongoimport\fP and \fI\%mongoexport\fP for
full instance production backups. They do not reliably preserve all rich
BSON data types, because JSON can only represent a subset
of the types supported by BSON. Use \fBmongodump\fP
and \fBmongorestore\fP as described in /core/backups for this
kind of functionality.
.UNINDENT
.UNINDENT
.sp
\fI\%mongoexport\fP must be run directly from the system command line.
.sp
To preserve type information, \fI\%mongoexport\fP and \fBmongoimport\fP
uses the strict mode representation
for certain types.
.sp
For example, the following insert operation in the \fBmongo\fP
shell uses the shell mode representation for the BSON types
\fBdata_date\fP and \fBdata_numberlong\fP:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
use test
db.traffic.insert( { _id: 1, volume: NumberLong(\(aq2980000\(aq), date: new Date() } )
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The argument to \fBdata_numberlong\fP must be quoted to avoid potential
loss of accuracy.
.sp
Use \fI\%mongoexport\fP to export the data:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db test \-\-collection traffic \-\-out traffic.json
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The exported data is in strict mode representation to preserve type information:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
{ "_id" : 1, "volume" : { "$numberLong" : "2980000" }, "date" : { "$date" : "2014\-03\-13T13:47:42.483\-0400" } }
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
See /reference/mongodb\-extended\-json for a complete list of
these types and the representations used.
.SH REQUIRED ACCESS
.sp
\fI\%mongoexport\fP requires read access on the target database.
.sp
Ensure that the connecting user possesses, at a minimum, the \fBread\fP
role on the target database.
.sp
When connecting to a \fBmongod\fP or \fBmongos\fP that enforces
/core/authentication, ensure you use the required security
parameters based on the configured
authentication mechanism\&.
.SH READ PREFERENCE
.sp
\fI\%mongoexport\fP defaults to \fBprimary\fP read
preference when connected to a \fBmongos\fP
or a replica set\&.
.sp
You can override the default read preference using the
\fI\%\-\-readPreference\fP option.
.sp
\fBIMPORTANT:\fP
.INDENT 0.0
.INDENT 3.5
Using a non\-primary read preference on a \fBmongos\fP may
produce inconsistencies in data, including duplicates or missing
documents.
.UNINDENT
.UNINDENT
.SH OPTIONS
.sp
Changed in version 3.0.0: \fI\%mongoexport\fP removed the \fB\-\-dbpath\fP as well as related
\fB\-\-directoryperdb\fP and \fB\-\-journal\fP options. To use
\fI\%mongoexport\fP, you must run \fI\%mongoexport\fP against a running
\fBmongod\fP or \fBmongos\fP instance as appropriate.

.sp
Changed in version 3.0.0: \fI\%mongoexport\fP removed the \fB\-\-csv\fP option. Use the
\fI\%\-\-type=csv\fP option to specify CSV format
for the output.

.INDENT 0.0
.TP
.B mongoexport
.UNINDENT
.INDENT 0.0
.TP
.B \-\-help
Returns information on the options and use of \fBmongoexport\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on standard output
or in log files. Increase the verbosity with the \fB\-v\fP form by
including the option multiple times, (e.g. \fB\-vvvvv\fP\&.)
.UNINDENT
.INDENT 0.0
.TP
.B \-\-quiet
Runs \fBmongoexport\fP in a quiet mode that attempts to limit the amount
of output.
.sp
This option suppresses:
.INDENT 7.0
.IP \(bu 2
output from database commands
.IP \(bu 2
replication activity
.IP \(bu 2
connection accepted events
.IP \(bu 2
connection closed events
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-version
Returns the \fBmongoexport\fP release number.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-uri <connectionString>
New in version 3.4.6.

.sp
Specify a resolvable URI
connection string for the \fBmongod\fP to which to
connect.
.sp
The following is the standard
URI connection scheme:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
For detailed explanations of the components of this string, refer to
the
Connection String URI Format
documentation.
.sp
\fBIMPORTANT:\fP
.INDENT 7.0
.INDENT 3.5
The following \fI\%mongoexport\fP options are incompatible with the
\fB\-\-uri\fP option. Instead, specify these options as part of your
\fB\-\-uri\fP connection string when applicable:
.INDENT 0.0
.IP \(bu 2
\fB\-\-host\fP
.IP \(bu 2
\fB\-\-port\fP
.IP \(bu 2
\fB\-\-db\fP
.IP \(bu 2
\fB\-\-username\fP
.IP \(bu 2
\fB\-\-password\fP (when specifying the password as part of the
URI connection string)
.IP \(bu 2
\fB\-\-authenticationDatabase\fP
.IP \(bu 2
\fB\-\-authenticationMechanism\fP
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-host <hostname><:port>, \-h <hostname><:port>
\fIDefault\fP: localhost:27017
.sp
Specifies a resolvable hostname for the \fBmongod\fP to which to
connect. By default, the \fBmongoexport\fP attempts to connect to a MongoDB
instance running on the localhost on port number \fB27017\fP\&.
.sp
To connect to a replica set, specify the
\fBreplSetName\fP and a seed list of set members, as in
the following:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
<replSetName>/<hostname1><:port>,<hostname2><:port>,<...>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
You can always connect directly to a single MongoDB instance by
specifying the host and port number directly.
.sp
Changed in version 3.0.0: If you use IPv6 and use the \fB<address>:<port>\fP format, you must
enclose the portion of an address and port combination in
brackets (e.g. \fB[<address>]\fP).

.UNINDENT
.INDENT 0.0
.TP
.B \-\-port <port>
\fIDefault\fP: 27017
.sp
Specifies the TCP port on which the MongoDB instance listens for
client connections.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ipv6
\fIRemoved in version 3.0.\fP
.sp
Enables IPv6 support and allows \fBmongoexport\fP to connect to the
MongoDB instance using an IPv6 network. Prior to MongoDB 3.0, you
had to specify \fI\%\-\-ipv6\fP to use IPv6. In MongoDB 3.0 and later, IPv6
is always enabled.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ssl
New in version 2.6.

.sp
Enables connection to a \fBmongod\fP or \fBmongos\fP that has
TLS/SSL support enabled.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslCAFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority. Specify the file name of the
\fB\&.pem\fP file using relative or absolute paths.
.sp
Starting in version 3.4, if \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP is not
specified and you are not using x.509 authentication, the
system\-wide CA certificate store will be used when connecting to an
TLS/SSL\-enabled server.
.sp
If using x.509 authentication, \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP
must be specified.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
\fBVersion 3.2 and earlier:\fP For TLS/SSL connections (\fB\-\-ssl\fP) to
\fBmongod\fP and \fBmongos\fP, if the \fBmongoexport\fP runs without the
\fI\%\-\-sslCAFile\fP, \fBmongoexport\fP will not attempt
to validate the server certificates. This creates a vulnerability
to expired \fBmongod\fP and \fBmongos\fP certificates as
well as to foreign processes posing as valid \fBmongod\fP or
\fBmongos\fP instances. Ensure that you \fIalways\fP specify the
CA file to validate the server certificates in cases where
intrusion is a possibility.
.UNINDENT
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslPEMKeyFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains both the TLS/SSL certificate
and key. Specify the file name of the \fB\&.pem\fP file using relative
or absolute paths.
.sp
This option is required when using the \fI\%\-\-ssl\fP option to connect
to a \fBmongod\fP or \fBmongos\fP that has
\fBCAFile\fP enabled \fIwithout\fP
\fBallowConnectionsWithoutCertificates\fP\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslPEMKeyPassword <value>
New in version 2.6.

.sp
Specifies the password to de\-crypt the certificate\-key file (i.e.
\fI\%\-\-sslPEMKeyFile\fP). Use the \fI\%\-\-sslPEMKeyPassword\fP option only if the
certificate\-key file is encrypted. In all cases, the \fBmongoexport\fP will
redact the password from all logging and reporting output.
.sp
If the private key in the PEM file is encrypted and you do not specify
the \fI\%\-\-sslPEMKeyPassword\fP option, the \fBmongoexport\fP will prompt for a passphrase. See
ssl\-certificate\-password\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslCRLFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the Certificate Revocation
List. Specify the file name of the \fB\&.pem\fP file using relative or
absolute paths.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowInvalidCertificates
New in version 2.6.

.sp
Bypasses the validation checks for server certificates and allows
the use of invalid certificates. When using the
\fBallowInvalidCertificates\fP setting, MongoDB logs as a
warning the use of the invalid certificate.
.sp
Starting in MongoDB 4.0, if you specify
\fB\-\-sslAllowInvalidCertificates\fP or \fBssl.allowInvalidCertificates:
true\fP when using x.509 authentication, an invalid certificate is
only sufficient to establish a TLS/SSL connection but is
\fIinsufficient\fP for authentication.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
For TLS/SSL connections to \fBmongod\fP and
\fBmongos\fP, avoid using
\fB\-\-sslAllowInvalidCertificates\fP if possible and only use
\fB\-\-sslAllowInvalidCertificates\fP on systems where intrusion is
not possible.
.sp
If the \fBmongo\fP shell (and other
mongodb\-tools\-support\-ssl) runs with the
\fB\-\-sslAllowInvalidCertificates\fP option, the
\fBmongo\fP shell (and other
mongodb\-tools\-support\-ssl) will not attempt to validate
the server certificates. This creates a vulnerability to expired
\fBmongod\fP and \fBmongos\fP certificates as
well as to foreign processes posing as valid
\fBmongod\fP or \fBmongos\fP instances.
.UNINDENT
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowInvalidHostnames
New in version 3.0.

.sp
Disables the validation of the hostnames in TLS/SSL certificates. Allows
\fBmongoexport\fP to connect to MongoDB instances even if the hostname in their
certificates do not match the specified hostname.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslFIPSMode
New in version 2.6.

.sp
Directs the \fBmongoexport\fP to use the FIPS mode of the installed OpenSSL
library. Your system must have a FIPS compliant OpenSSL library to use
the \fI\%\-\-sslFIPSMode\fP option.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
FIPS\-compatible TLS/SSL is
available only in \fI\%MongoDB Enterprise\fP\&. See
/tutorial/configure\-fips for more information.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-username <username>, \-u <username>
Specifies a username with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-password\fP and
\fB\-\-authenticationDatabase\fP options.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-password <password>, \-p <password>
Specifies a password with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-username\fP and
\fB\-\-authenticationDatabase\fP options.
.sp
Changed in version 3.0.0: If you do not specify an argument for \fI\%\-\-password\fP, \fBmongoexport\fP returns
an error.

.sp
Changed in version 3.0.2: If you wish \fBmongoexport\fP to prompt the user
for the password, pass the \fI\%\-\-username\fP option without
\fI\%\-\-password\fP or specify an empty string as the \fI\%\-\-password\fP value,
as in \fB\-\-password ""\fP .

.UNINDENT
.INDENT 0.0
.TP
.B \-\-authenticationDatabase <dbname>
Specifies the database in which the user is created.
See user\-authentication\-database\&.
.sp
If you do not specify an authentication database, \fBmongoexport\fP
assumes that the database specified to export holds the user’s credentials.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-authenticationMechanism <name>
\fIDefault\fP: SCRAM\-SHA\-1
.sp
Specifies the authentication mechanism the \fBmongoexport\fP instance uses to
authenticate to the \fBmongod\fP or \fBmongos\fP\&.
.sp
Changed in version 4.0: MongoDB removes support for the deprecated MongoDB
Challenge\-Response (\fBMONGODB\-CR\fP) authentication mechanism.
.sp
MongoDB adds support for SCRAM mechanism using the SHA\-256 hash
function (\fBSCRAM\-SHA\-256\fP).

.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
SCRAM\-SHA\-1
T}	T{
\fI\%RFC 5802\fP standard
Salted Challenge Response Authentication Mechanism using the SHA\-1
hash function.
T}
_
T{
SCRAM\-SHA\-256
T}	T{
\fI\%RFC 7677\fP standard
Salted Challenge Response Authentication Mechanism using the SHA\-256
hash function.
.sp
Requires featureCompatibilityVersion set to \fB4.0\fP\&.
.sp
New in version 4.0.
T}
_
T{
MONGODB\-X509
T}	T{
MongoDB TLS/SSL certificate authentication.
T}
_
T{
GSSAPI (Kerberos)
T}	T{
External authentication using Kerberos. This mechanism is
available only in \fI\%MongoDB Enterprise\fP\&.
T}
_
T{
PLAIN (LDAP SASL)
T}	T{
External authentication using LDAP. You can also use \fBPLAIN\fP
for authenticating in\-database users. \fBPLAIN\fP transmits
passwords in plain text. This mechanism is available only in
\fI\%MongoDB Enterprise\fP\&.
T}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-gssapiServiceName
New in version 2.6.

.sp
Specify the name of the service using GSSAPI/Kerberos\&. Only required if the service does not use the
default name of \fBmongodb\fP\&.
.sp
This option is available only in MongoDB Enterprise.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-gssapiHostName
New in version 2.6.

.sp
Specify the hostname of a service using GSSAPI/Kerberos\&. \fIOnly\fP required if the hostname of a machine does
not match the hostname resolved by DNS.
.sp
This option is available only in MongoDB Enterprise.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-db <database>, \-d <database>
Specifies the name of the database on which to run the \fBmongoexport\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-collection <collection>, \-c <collection>
Specifies the collection to export.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-fields <field1[,field2]>, \-f <field1[,field2]>
Specifies a field or fields to \fIinclude\fP in the export. Use a comma
separated list of fields to specify multiple fields.
.sp
If any of your field names include white space, use
quotation marks to enclose the field list. For example, if you wished
to export two fields, \fBphone\fP and \fBuser number\fP, you would
specify \fB\-\-fields "phone,user number"\fP\&.
.sp
For \fI\%csv\fP output formats,
\fI\%mongoexport\fP includes only the specified field(s), and the
specified field(s) can be a field within a sub\-document.
.sp
For JSON output formats, \fI\%mongoexport\fP includes
only the specified field(s) \fBand\fP the \fB_id\fP field, and if the
specified field(s) is a field within a sub\-document, the
\fI\%mongoexport\fP includes the sub\-document with all
its fields, not just the specified field within the document.
.sp
See: \fI\%Export Data in CSV Format using \-\-fields option\fP for sample usage.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-fieldFile <filename>
An alternative to \fI\%\-\-fields\fP\&. The
\fI\%\-\-fieldFile\fP option allows you to
specify in a file the field or fields to \fIinclude\fP in the export and is
\fBonly valid\fP with the \fI\%\-\-type\fP option
with value \fBcsv\fP\&. The
file must have only one field per line, and the line(s) must end with
the LF character (\fB0x0A\fP).
.sp
\fI\%mongoexport\fP includes only the specified field(s). The
specified field(s) can be a field within a sub\-document.
.sp
See \fI\%Use a File to Specify the Fields to Export in CSV Format\fP for sample usage.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-query <JSON>, \-q <JSON>
Provides a JSON document as a query that optionally limits
the documents returned in the export. Specify JSON in strict
format\&.
.sp
You must enclose the query in single quotes (e.g. \fB\(aq\fP) to ensure that it does
not interact with your shell environment.
.sp
For example, given a collection named \fBrecords\fP in the database
\fBtest\fP with the following documents:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
{ "_id" : ObjectId("51f0188846a64a1ed98fde7c"), "a" : 1 }
{ "_id" : ObjectId("520e61b0c6646578e3661b59"), "a" : 1, "b" : 2 }
{ "_id" : ObjectId("520e642bb7fa4ea22d6b1871"), "a" : 2, "b" : 3, "c" : 5 }
{ "_id" : ObjectId("520e6431b7fa4ea22d6b1872"), "a" : 3, "b" : 3, "c" : 6 }
{ "_id" : ObjectId("520e6445b7fa4ea22d6b1873"), "a" : 5, "b" : 6, "c" : 8 }
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The following \fI\%mongoexport\fP uses the \fI\%\-q\fP option to
export only the documents with the field \fBa\fP greater than or equal to
(\fB$gte\fP) to \fB3\fP:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-d test \-c records \-q \(aq{ a: { $gte: 3 } }\(aq \-\-out exportdir/myRecords.json
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The resulting file contains the following documents:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
{ "_id" : { "$oid" : "520e6431b7fa4ea22d6b1872" }, "a" : 3, "b" : 3, "c" : 6 }
{ "_id" : { "$oid" : "520e6445b7fa4ea22d6b1873" }, "a" : 5, "b" : 6, "c" : 8 }
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
You can sort the results with the \fI\%\-\-sort\fP option to
\fI\%mongoexport\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-type <string>
\fIDefault\fP: json
.sp
New in version 3.0.

.sp
Specifies the file type to export. Specify \fBcsv\fP for CSV
format or \fBjson\fP for JSON format.
.sp
If you specify \fBcsv\fP, then you must also use either
the \fI\%\-\-fields\fP or the \fI\%\-\-fieldFile\fP option to
declare the fields to export from the collection.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-out <file>, \-o <file>
Specifies a file to write the export to. If you do not specify a file
name, the \fI\%mongoexport\fP writes data to standard output
(e.g. \fBstdout\fP).
.UNINDENT
.INDENT 0.0
.TP
.B \-\-jsonArray
Modifies the output of \fI\%mongoexport\fP to write the
entire contents of the export as a single JSON array. By
default \fI\%mongoexport\fP writes data using one JSON document
for every MongoDB document.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-pretty
New in version 3.0.0.

.sp
Outputs documents in a pretty\-printed format JSON.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-noHeaderLine
New in version 3.4.

.sp
By default, \fBmongoexport\fP includes the exported field names as the first
line in a CSV output. \fI\%\-\-noHeaderLine\fP directs \fBmongoexport\fP to export the
data without the list of field names.
\fI\%\-\-noHeaderLine\fP is \fBonly valid\fP with the
\fI\%\-\-type\fP option with value \fBcsv\fP\&.
.sp
See \fI\%Exclude Field Names from CSV Output\fP for sample usage.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-slaveOk, \-k
Deprecated since version 3.2.

.sp
Sets the replica\-set\-read\-preference to \fBnearest\fP,
allowing \fI\%mongoexport\fP to read data from secondary
replica set members.
.sp
\fI\%\-\-readPreference\fP replaces \fB\-\-slaveOk\fP in MongoDB 3.2. You cannot
specify \fB\-\-slaveOk\fP when \fI\%\-\-readPreference\fP is specified.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Using a read preference other than
\fBprimary\fP with a connection to a \fBmongos\fP may produce
inconsistencies, duplicates, or result in missed documents.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-readPreference <string>
Specify the read preference for
\fBmongoexport\fP\&.
.sp
See replica\-set\-read\-preference\-modes\&.
.sp
\fBmongoexport\fP defaults to \fBprimary\fP
read preference when connected to a
\fBmongos\fP or a replica set\&.
.sp
Otherwise, \fBmongoexport\fP defaults to \fBnearest\fP\&.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Using a read preference other than
\fBprimary\fP with a connection to a \fBmongos\fP may produce
inconsistencies, duplicates, or result in missed documents.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-forceTableScan
Forces \fI\%mongoexport\fP to scan the data store directly instead
of traversing the \fB_id\fP field index. Use \fI\%\-\-forceTableScan\fP to skip the
index. Typically there are two cases where this behavior is
preferable to the default:
.INDENT 7.0
.IP 1. 3
If you have key sizes over 800 bytes that would not be present
in the \fB_id\fP index.
.IP 2. 3
Your database uses a custom \fB_id\fP field.
.UNINDENT
.sp
When you run with \fI\%\-\-forceTableScan\fP, \fI\%mongoexport\fP may return a
document more than once if a write operation interleaves with the
operation to cause the document to move.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Use \fI\%\-\-forceTableScan\fP with extreme caution
and consideration.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-skip <number>
Use \fI\%\-\-skip\fP to control where \fI\%mongoexport\fP begins
exporting documents. See \fBskip()\fP for information about
the underlying operation.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-limit <number>
Specifies a maximum number of documents to include in the
export. See \fBlimit()\fP for information about
the underlying operation.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sort <JSON>
Specifies an ordering for exported results. If an index does
\fBnot\fP exist that can support the sort operation, the results must
be \fIless than\fP 32 megabytes.
.sp
Use \fI\%\-\-sort\fP conjunction with \fI\%\-\-skip\fP and
\fI\%\-\-limit\fP to limit number of exported documents.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-d test \-c records \-\-sort \(aq{a: 1}\(aq \-\-limit 100 \-\-out export.0.json
mongoexport \-d test \-c records \-\-sort \(aq{a: 1}\(aq \-\-limit 100 \-\-skip 100 \-\-out export.1.json
mongoexport \-d test \-c records \-\-sort \(aq{a: 1}\(aq \-\-limit 100 \-\-skip 200 \-\-out export.2.json
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
See \fBsort()\fP for information about the underlying
operation.
.UNINDENT
.SH USE
.SS Export in CSV Format
.sp
Changed in version 3.0.0: \fI\%mongoexport\fP removed the \fB\-\-csv\fP option. Use the
\fI\%\-\-type=csv\fP option to specify CSV format
for the output.

.SS Export Data in CSV Format using \fB\-\-fields\fP option
.sp
In the following example, \fI\%mongoexport\fP exports data from the
collection \fBcontacts\fP collection in the \fBusers\fP database in CSV
format to the file \fB/opt/backups/contacts.csv\fP\&.
.sp
The \fBmongod\fP instance that \fI\%mongoexport\fP connects to is
running on the localhost port number \fB27017\fP\&.
.sp
When you export in CSV format, you must specify the fields in the documents
to export. The operation specifies the \fBname\fP and \fBaddress\fP fields
to export.
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db users \-\-collection contacts \-\-type=csv \-\-fields name,address \-\-out /opt/backups/contacts.csv
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
name, address
Sophie Monroe, 123 Example Road
Charles Yu, 345 Sample Street
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Use a File to Specify the Fields to Export in CSV Format
.sp
For CSV exports only, you can also specify the fields in a file
containing the line\-separated list of fields to export. The file must
have only one field per line.
.sp
For example, you can specify the \fBname\fP and \fBaddress\fP fields in a
file \fBfields.txt\fP:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
name
address
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Then, using the \fI\%\-\-fieldFile\fP option, specify the fields to export with
the file:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db users \-\-collection contacts \-\-type=csv \-\-fieldFile fields.txt \-\-out /opt/backups/contacts.csv
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Exclude Field Names from CSV Output
.sp
New in version 3.4.

.sp
MongoDB 3.4 added the \fI\%\-\-noHeaderLine\fP option for excluding the
field names in a CSV export. The following example exports the \fBname\fP
and \fBaddress\fP fields in the \fBcontacts\fP collection in the \fBusers\fP
database and uses \fI\%\-\-noHeaderLine\fP to suppress the output
of the field names as the first line:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db users \-\-collection contacts \-\-type csv \-\-fields name,address \-\-noHeaderLine \-\-out /opt/backups/contacts.csv
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The CSV output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
Sophie Monroe, 123 Example Road
Charles Yu, 345 Sample Street
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Export in JSON Format
.sp
This example creates an export of the \fBcontacts\fP collection from the
MongoDB instance running on the localhost port number \fB27017\fP\&. This
writes the export to the \fBcontacts.json\fP file in JSON format.
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db sales \-\-collection contacts \-\-out contacts.json
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Export from Remote Host Running with Authentication
.sp
The following example exports the \fBcontacts\fP collection from the
\fBmarketing\fP database, which requires authentication.
.sp
This data resides on the MongoDB instance located on the host
\fBmongodb1.example.net\fP running on port \fB37017\fP, which requires the username
\fBuser\fP and the password \fBpass\fP\&.
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-host mongodb1.example.net \-\-port 37017 \-\-username user \-\-password "pass" \-\-collection contacts \-\-db marketing \-\-out mdb1\-examplenet.json
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Export Query Results
.sp
You can export only the results of a query by supplying a query filter with
the \fI\%\-\-query\fP option, and limit the results to a single
database using the “\fI\%\-\-db\fP” option.
.sp
For instance, this command returns all documents in the \fBsales\fP database’s
\fBcontacts\fP collection that contain a field named \fBfield\fP with a value
of \fB1\fP\&.
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongoexport \-\-db sales \-\-collection contacts \-\-query \(aq{"field": 1}\(aq
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
You must enclose the query in single quotes (e.g. \fB\(aq\fP) to ensure that it does
not interact with your shell environment.
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2008-2018
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