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Description

Error 207, "Invalid UUID", indicates that a Uniformly Unique Identifier (UUID) string provided to MongoDB does not conform to the expected standard format. This typically occurs during data insertion, updates, or queries when a UUID field receives a value that is malformed, contains invalid characters, or has incorrect length/structure.

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Error Message

Invalid UUID

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Known Causes

4 known causes

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Incorrect UUID String Format

The UUID string provided does not follow the standard 36-character format (e.g., `xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`).

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Non-Hexadecimal Characters

The UUID string contains characters that are not valid hexadecimal digits (0-9, A-F, a-f) or are misplaced hyphens.

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Improper Data Type Handling

Application code might be attempting to store or query a value as a UUID that is not a properly formatted string, leading to conversion failure.

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Missing or Misplaced Hyphens

The UUID string is missing required hyphens or has them in incorrect positions, deviating from the standard pattern.

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Solutions

3 solutions available

1. Validate and Correct UUID Format in Application Code easy

Ensure your application generates and handles UUIDs in the correct 36-character hexadecimal string format.

1

Review your application's code that interacts with MongoDB. Specifically, identify where UUIDs are generated or inserted into the database.

2

Verify that UUIDs are being generated using a standard library or method that produces a valid 36-character hexadecimal string (e.g., `xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`).

Example in Node.js using `uuid` library:
javascript
const { v4: uuidv4 } = require('uuid');
const newUUID = uuidv4(); // This will generate a valid UUID
console.log(newUUID);

3

If you are manually constructing UUID strings, ensure they adhere to the standard format. Incorrectly formatted strings (e.g., missing hyphens, invalid characters) will cause this error.

4

If UUIDs are being read from an external source, validate their format before inserting them into MongoDB.

2. Correct Malformed UUIDs in Existing MongoDB Documents medium

Identify and update documents containing invalid UUIDs directly in MongoDB.

1

Connect to your MongoDB instance using the `mongosh` shell or a GUI tool.

2

Query for documents that might contain malformed UUIDs. This often involves searching for fields that should be UUIDs but are not in the correct format.

db.yourCollection.find({ yourUUIDField: { $regex: /^[^0-9a-fA-F]{8}-[^0-9a-fA-F]{4}-[^0-9a-fA-F]{4}-[^0-9a-fA-F]{4}-[^0-9a-fA-F]{12}$/i } }).pretty(); // This regex is a basic example and might need adjustment.
OR
db.yourCollection.find({ yourUUIDField: { $not: { $type: 'uuid' } } }).pretty(); // If you expect BSON UUID type.

3

For each identified document, manually correct the UUID field to a valid format. This might involve generating a new UUID and updating the document.

db.yourCollection.updateOne(
  { _id: ObjectId('yourDocumentId') },
  { $set: { yourUUIDField: 'a1b2c3d4-e5f6-7890-1234-567890abcdef' } } // Replace with a valid UUID
);

4

Alternatively, if you have a script or application that can generate valid UUIDs, you can use it to update these documents in bulk.

3. Re-evaluate Data Type for UUID Fields medium

Confirm that fields intended to store UUIDs are correctly defined and handled as the BSON UUID type.

1

Understand how your application and MongoDB are storing UUIDs. MongoDB supports a specific BSON UUID type.

2

Check your MongoDB schema or data model. Ensure that fields intended for UUIDs are consistently treated as the BSON UUID type. If they are stored as strings, ensure the string format is valid.

3

If you are using a driver, ensure it's configured to correctly serialize and deserialize UUIDs to and from the BSON UUID type. Many drivers have specific functions or type mappings for UUIDs.

Example in Python using PyMongo:
python
from uuid import uuid4
from bson.binary import UUID_SUBTYPE

# To insert a UUID
my_uuid = uuid4()
db.yourCollection.insert_one({'_id': 1, 'uuid_field': my_uuid})

# To query for a UUID
retrieved_doc = db.yourCollection.find_one({'uuid_field': my_uuid})

4

If you find fields that are inconsistently stored (sometimes as BSON UUID, sometimes as strings), you may need to migrate the data to a consistent format.

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Related Errors

5 related errors

MongoDB Error 207: Malformed UUID Value