Issue Description

Executing mongoexport CLI utility gives the below error,

error validating settings: query ” is not valid JSON: invalid character ‘2’ after top-level value

Resolution

mongoexport is a CLI *command-line interface) a tool that creates a JSON or CSV export of data stored in a MongoDB database.

It’s important to run this command from the system command line and not from the mongo shell.

While using mongoexport , please follow the below guidelines while using the –query option in the commands.

• Mongoexport requires a query option to send the query as a JSON document i.e query with enclosed documents.

• The query must be in Extended JSON v2 format ie. either relaxed or canonical/strict mode with enclosing the field names and operators in quotes:

Considering I had below sample query to be run with export commands,

'{"DateAdded":{"$gt":ISODate('2022-01-01T00:00:00.000+00:00')}}'

while using the above query, I got the below error,

mongoexport.exe –uri=mongodb://xxxx:27017/TheCodeBuzz?readPreference=primary -q ‘{“DateAdded”:{“$gt”:ISODate(‘2022-01-01T00:00:00.000+00:00′)}}’ –out=C://opt/test6.csv –type=csv –collection=Books –fields=UserId,DateAdded
2022-11-27T16:38:27.330-0500 WARNING: ignoring unsupported URI parameter ‘readpreference’
2022-11-27T16:38:29.385-0500 error validating settings: query ‘[39 123 68 97 116 101 65 100 100 101 100 58 123 36 103 116 58 73 83 79 68 97 116 101 40 39 50 48 50 50 45 48 49 45 48 49 84 48 48 58 48 48 58 48 48 46 48 48 48 43 48 48 58 48 48 39 41 125 125 39]’ is not valid JSON: invalid character ‘2’ after top-level value
2022-11-27T16:38:29.385-0500 try ‘mongoexport –help’ for more information

I was able to resolve the issue below two approaches,

Approach 1

I was able to fix the issue by swapping the double quotes as below,

 "{'DateAdded':{'$gt':ISODate('2022-01-01T00:00:00.000+00:00')}}"

Approach 2

I was also able to run all complex queries using double quotes as below,

"{\"DateAdded\":{\"$gt\":ISODate('2022-01-01T00:00:00.000+00:00')}}"

Using either of the above approaches results were successful,

That’s all! Happy coding!

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Today in this article, we shall see how to Redirect Output of Mongo query to a file ( CSV or JSON ) using available tools like MongoExport CLI tools.

You may have required MongoDB query which returns the records collection using needed criteria.

If you need to run Mongoquery and want to store the mongodb query output to file like JSON or CSV file, then please follow the below explained steps.

Today in this article, we will cover below aspects,

We shall see how to export the MongoDB collection as CSV or JSON using Compass UI and mongoexport utility tools available.

Using the CLI tool mongoexport to redirect query output CSV or JSON

Using the CLI tool mongoexport to export the data as CSV or JSON

mongoexport utility can be found at the below location,

C:\Program Files\MongoDB\Server.0\bin

Command

mongoexport.exe --uri="mongodb uri" --collection="collection name" --type=csv -q 'MongoDb query" --fields=fields1,field2,field3 --out = "file name"

In the above example,

• –uri – Specify the hostname and port in the

• –collection – Specifies the collection to export.

• –db – Specifies the name of the database

• –fields – Specifies a field or fields to include in the export. To specify multiple fields, use a comma-separated list of fields.

• –out – Specifies a file name to which to write the data returned from the query.

• --query or -q – provides a query as a JSON document (enclosed in quotes) to return matching documents in the export.

Specifies query as a JSON document to return matching documents in the export. The query should be enclosed (enclosed in quotes).

For more details on all the commands options please visit

Example Mongo Query

{"DateAdded":{"$gt":ISODate('2022-01-01T00:00:00.000+00:00')}}

Let’s execute the above query as below using the MongoExport utility,

mongoexport.exe --uri= mongodb://xxxx:xxxx/TheCodeBuzz?readPreference=primary --collection=Books  -q "{\"DateAdded\":{\"$gt\":ISODate('2022-01-01T00:00:00.000+00:00')}}" --type=csv --out=C://opt/sample.csv --fields=UserId,DateAdded

Above we are running a date range query where we are trying to get all the records where “DateAdded” is greater than the 2022 year from Mongo.

We are exporting a CSV for 2 fields i.e UserId, DateAdded

Generated CSV file looks as below,

MongoCompass UI – get output from query within UI

If you are using MongoCompass UI or Robo mongo client, both have rich UI features which let you redirect the query output to documents like CSV or JSON as required.

Steps to redirect the query as below,

Step1: Open the collection and click on the Export Collection icon

Step 2: Select an option to export using a filter query. you can select only fields of your choice.

Step 3: Select the fields that need to be downloaded in the target exported file

Step 4: Please select the options JSON or CSV as required.

You need to provide an output file path. Next click on the EXPORT button.

After successful export, you shall see a generated CSV or JSON file with the required details.

Reference :

• MongoDB Distributed Transaction – Guidelines

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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The post MongoDB- How to Redirect Output of Mongo query to a file ( CSV or JSON) first appeared on TheCodeBuzz.