Mongoose schema validate without creating a document

Question

Say I have a javascript object (the data) and I want to check to see if it conforms to a given Schema that I've defined.

Is there a way to do this without turning the schema into a model, creating an instance of that model populated with the data, and running mymodel.validate()?

I'd love to have a Schema(definition).validate(data, callback), but the validate function is defined on the Document class, from what I could tell.

`model.create(data).validate()` doesn't seem that hard to me, and is probably your best option. Why do you want another syntax? — Andreas Hultgren, Sep 13 '13 at 18:15
No, it's not possible without digging through the internals. — WiredPrairie, Sep 13 '13 at 18:21
:( I don't want to creaete a model for this schema. but maybe I'll have to. Seems like it ought to be extractable. — Jared Forsyth, Sep 14 '13 at 16:55
+1 My use case is that I want to validate documents on the client. My *other* use case is that I want to use Mongoose's schema format to validate internal messages which I never intend to store in the DB. — joeytwiddle, Nov 11 '16 at 04:01

score 1 · Accepted Answer · answered Nov 10 '21 at 03:59

1

2021 update

Mongoose added that functionality as Model.validate(...) back in 2019 (v5.8.0):

You can:

try {
  await Model.validate({ name: 'Hafez', age: 26 });
} catch (err) {
  err instanceof mongoose.Error.ValidationError; // true
}

answered Nov 10 '21 at 03:59

Hafez

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score 0 · Answer 2 · answered Apr 22 '20 at 19:24

One way is to perform that with the help of custom validators. When the validation declined, it failed to save the document into the database.

Or another way to do that through validate() function provided by MongoDB with the same schema as you defined.

Ofir Bi · Answer 3 · 2021-09-19T07:37:20.747

0

You can validate your schema on the Mongo side link
For example:

db.createCollection("students", {
   validator: {
      $jsonSchema: {
         bsonType: "object",
         required: [ "name" ],
         properties: {
            name: {
               bsonType: "string",
               description: "must be a string and is required"
            },
            year: {
               bsonType: "int",
               minimum: 2017,
               maximum: 3017,
               description: "must be an integer in [ 2017, 3017 ] and is required"
            }
         }
      }
   }
})

edited Sep 19 '21 at 07:37

answered Sep 18 '21 at 21:42

Ofir Bi

236
1
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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - [From Review](/review/late-answers/29861893) – Sep 19 '21 at 01:45

Mongoose schema validate without creating a document

3 Answers3

2021 update