How to use MongoDB for nodejs to modify the schema of an existing collection？

Working with Data Drivers
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The function db.createCollection provided by the MongoDB module is difficult to use. It cannot modify the schema of a collection in an existing database.

How to use MongoDB for nodejs to modify the schema of an existing collection？

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Once a collection has been created, use the collMod command to modify the validator for a collection. See Database Commands in the Node.js driver documentation for a general example of how to call a database command like collMod.

I couldn’t find an obvious example of modifying schema validation in the Node.js driver docs, so I created an improvement suggestion in the issue tracker which you can upvote & watch: NODE-2511: Add example for changing validator on an existing collection.

Note: the $jsonSchema query operator is also useful to test schema validation changes against existing documents. For an example using the mongo shell, see: How to find all invalid document based on jsonSchema validator?.

Regards,
Stennie

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thanks for your help

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client.db('dbName').command({collMod:'collectionName',{validator:{$jsonSchema:{ //your schema}, validationOptions}
make you sure you have a dbAdmin role , (in your user settings choose grant specific privileges and add dbAdmin and other roles you need , for example first role : dbAdmin and second: readWrite , and don’t forget to specify the database name )