How to Convert Objectid to String

ObjectId.toString() and ObjectId.valueOf() are in Mongo JavaScript API.

In Python API (with PyMongo) proper way is to use pythonic str(object_id) as you suggested in comment, see documentation on ObjectId.

ObjectId.toString() returns the string representation of the ObjectId() object.

In pymongo str(o) get a hex encoded version of ObjectId o.

Check this link.

What works for me is to "sanitize" the output so Pydantic doesn't get indigestion from an _id that is of type ObjectId...here's what works for me... I'm converting _id to a string before returning the output...

# Get One
@router.get("/{id}")
def get_one(id):
    query = {"_id": ObjectId(id)}
    resp = db.my_collection.find_one(query)

    if resp:
        resp['_id'] = str(resp['_id'])
        return resp
    else:
        raise HTTPException(status_code=404, detail=f"Unable to retrieve record")

Use str(ObjectId), as already mentined in the comment by @Simon.

@app.route("/api/employee", methods=['POST'])
def create_employee():
    json = request.get_json()
    result = employee.insert_employee(json)
    return { "id": str(result.inserted_id) }