Q:

Is there a way to check for duplicate entries in values of an array in MongoDB?

I am trying to remove the duplicate values from a deeply nested array. I've put the structure of the database down below. I want to compare the location of the steps with eachother and check for duplicates. I was thinking about using db.collection.aggregate, but it becomes a problem when trying to search through all steps since { $unwind: '$mapbox.routes.legs.0.steps' } requires a specific index for the steps as far as i know.
"mapboxRoute" : {
        "routes" : [ 
            {
                "distance" : 105375,
                "duration" : 8261.3,
                "weight" : 11365.5,
                "weight_name" : "routability",
                "geometry" : 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                "legs" : [ 
                    {
                        "distance" : 105336.1,
                        "duration" : 8259.5,
                        "steps" : [ 
                            {
                                "distance" : 132.5,
                                "duration" : 50,
                                "geometry" : "iv||H_{f^w@b@??AFDZ??H`@?@DT??BL???B@LN`A??Lx@??BP",
                                "name" : "Mariaplaats",
                                "ref" : null,
                                "destinations" : null,
                                "exits" : null,
                                "driving_side" : "right",
                                "mode" : "driving",
                                "maneuver" : {
                                    "location" : [ 
                                        5.117934, 
                                        52.089493
                                    ]

Does someone know how I can compare the locations of the steps?

A:

At the end I stopped making a seperate file for connecting with mongodb and cleaning the database and started using the already existing API to create a call. In this call I looped through the steps in the database and mapped the location to a key. After that I check if that key already existed and pushed that index to a duplicate array.
Then I proceeded to loop through the duplicate list and spliced the duplicate entries from the list with steps. After that I ran the following function to update the entry: await routeSchema.updateOne({ _id: route._id }, { $set: route });

