Mongodb iterate over collection nodejs Array of indexes, [ [‘a’, 1]] etc. Sep 10, 2015 · I've tried looping through Mongo with forEach () but I don't know the shell well enough on how to update each document in the collection. 6 on, fsync cannot be combined with journal j, (Boolean, default:false) write waits for journal sync before returning continueOnError/keepGoing {Boolean, default:false}, keep inserting documents even if one document has an error, mongodb 1. js + mongodb (managed with mongoose). Basic Setup Mar 11, 2025 · This tutorial will discuss how to check if a collection exists in MongoDB using NodeJS. MongoDB and Node. const cursor = collection. My research indicates that the cursor may be timing out but not sure how that is possible considering the operations are pretty quick. js development, working with databases is a common requirement. Learn about various methods such as using listCollections, countDocuments, and getCollectionNames with practical code examples. When we execute a query using methods like find(), MongoDB returns a cursor object that allows you to efficiently retrieve and process documents from the database one by one. find() method in mongosh. Jun 14, 2014 · I'm using mongojs and I'm trying to iterate over all elements in a collection index = 0 db. It takes a callback function as an argument, which is executed for each document. js script. 96 key: EeW6E 97 key: wqfmM 98 key: LIGHK 99 key: bjWTI 100 key: 2zNGE 101 key Oct 18, 2025 · When querying a MongoDB collection in a Node. eval. For testing purposes I wanted to Note that large numbers of matched documents can cause performance issues or failures if the operation exceeds memory constraints. Each document consists of a simple JSON with a numeric id, a URL and an integer to store the status of that document. I have to call multiple external APIs for every item (create an invoice, send the data to the government, etc). Note that large numbers of matched documents can cause performance issues or failures if the operation exceeds memory constraints. The MongoDB Atlas UI. Discover our MongoDB Database Management courses and begin improving your CV with MongoDB certificates. Let's say I have 3 different collections. I have tried doin Aug 28, 2014 · First of, I'm quite new to mongodb. MongoDB, a popular NoSQL database, offers a powerful feature called cursors. find(). Docs Home → Develop Applications → MongoDB Drivers → Node. 9. Dec 7, 2022 · Loop on array, then update an object field using ObjectId Working with Data Node. js work seamlessly together in modern tech stacks. This can be especially beneficial when you need to process or transform each document retrieved from a query. For more information on querying MongoDB, see our Nov 28, 2020 · How to loop through a Collection and do operations - Mongodb, Nodejs Asked 4 years, 6 months ago Modified 4 years, 6 months ago Viewed 983 times In this guide, you can learn how to interact with MongoDB databases and collections by using the Node. MongoDB Manual: how to query documents and top-level fields, perform equality match, query with query operators, and specify compound query conditions. After quite a bit of time, I start getting a Mongo Error: Cursor ID not found. 3 you can use async iterator const cursor = db. js MongoDB allows you to retrieve multiple documents from a collection that match a specific query. keys. Docs Home / / Collections Docs Home / / mongosh Methods / Collections Docs Home / Development / Reference / mongosh Methods / Collections db. find({}, {uid: 1, _id: 0}). js driver uses the asynchronous Javascript API to communicate with your MongoDB cluster. . The find() method uses a query document that you provide to match the subset of the documents in the collection that match the query. To learn more, see Query an Array with MongoDB Atlas. For the related project we are using nodes. Iterate over documents in a MongoDB cursor using `forEach ()` to apply a JavaScript function to each document. hint {Object}, hint force the query to use a specific index. js application, it provides an efficient way to handle large datasets retrieved from a MongoDB database. log (++index) + " key: " + key_uid which logs 1 key: bB0KN 2 key: LOtOL 3 key: 51xJM 4 key: x9wFP 5 key: hcJKP 6 key: QZxnE . When working with MongoDB, looping through documents is a common task that can be accomplished in various ways depending on the use case. Collections: Groups of MongoDB documents. A MongoDB cursor is an object that allows you to iterate over the results of a query. any help Collection object is a pointer to a specific collection in the database. MongoDB organizes data into a hierarchy of the following levels: Databases: Top-level data structures in a MongoDB deployment that store collections. New to node. Here is my schema: 'use strict'; const mongoose = require ('mongoose'); const Schema = mongoose. It returns a cursor object, which you can iterate over to access the Nov 21, 2023 · In MongoDB, a collection is a group of documents. Consider using the for awaitof syntax to iterate through results rather than returning all documents at once. Apr 25, 2024 · The find() method in Node. You can query for multiple documents in a collection with collection. MongoDB Compass. Documents within a collection can have varying Aug 13, 2017 · I want to be able to iterate through a collection so that I am able to go through all the objects. Consider using forEach () to iterate through results unless you want to return all documents at once. Enhance your MongoDB management skills and ensure smooth application performance. Learn how to access data from a cursor in the MongoDB Node. mongos> show collections collectionA collectionB collec 41 since node. This page provides examples of query operations on embedded/nested documents using the db. Nov 17, 2021 · Using cursor-based iteration can be useful when there is a need to iterate (in memory) over all of the documents from a collection and every document is a big object. Connect to a test database in your MongoDB instance then create the inventory collection: Using cursor. Learn how to set up Node. if i group with id to get the unique ids, the execution time on my local environment is over 20 seconds. It seems that I can’t stop a forEach loop Docs Home → Develop Applications → MongoDB Drivers → Node. forEach() is a method used to iterate over documents in a cursor, applying a specified function to each document in the result set. When used in a Node. This blog post will Jul 23, 2025 · In MongoDB, a cursor is a powerful object that enables us to iterate over the results of a query. Query an Array You can query arrays in MongoDB using the following methods: Your programming language's driver. This guide explores effective methods for iterating over documents using JavaScript, which is particularly useful when using Node. I was able to use a cursor and the forEach method but I want to test the URL and update the status if it’s an existing URL. js Find Multiple Documents This version of the documentation is archived and no longer supported. js driver. Oct 18, 2025 · In the world of Node. I haven’t reached any bottlenecks yet, I’m just curios what’s the most efficient way to iterate over the items in a large collection without hurting the server too much. after the $match pipeline the result set becomes less than 5 Million. toArray (); Mar 4, 2018 · 1 Trying to aggregate some data from a list of MongoDB collection and when aggregation is done over all the collections, I want to return the complete aggregation of all the suitable collections with the name and aggregated value as a JSON object back. AFAIK aggregation framework can “reduce” the collection data Dec 26, 2018 · I'm working on a NodeJS application using a MongoDB database. It has about 1800 documents and is hosted in Atlas. If you don't provide a query document (or if you provide an empty document), MongoDB returns all documents in the collection. js In MongoDB, cursor. This helps prevent your application from becoming unresponsive when executing long-running operations. Think of it as the equivalent of a table in a relational database, but with more flexibility. js and MongoDB as well as how to query data stored in a MongoDB database from a Node. fsync, (Boolean, default:false) write waits for fsync before returning, from MongoDB 2. Documents: Units that store literal Options skip {Number} skip number of documents to skip. log err else console. js v10. collection('foo'). 1 >. js with MongoDB. limit {Number}, limit the number of results to return. forEach() in Node. Feb 17, 2021 · I have written a small node program using Mongoose to iterate over collection using a cursor. Aug 26, 2014 · I have a huge collection of documents in my DB and I'm wondering how can I run through all the documents and update them, each document with a different value. I am new to MongoDB and new here, too. sort {Array | Object}, set to sort the documents coming back from the query. explain Learn how to add MongoDB Atlas to your TypeScript applications, by creating NodeJS and Express Web API. js Frameworks crud, mongoose-odm, queries, node-js Slog_Go (Slog Go) December 7, 2022, 2:30pm 1 Jun 24, 2020 · I have a collection with over 10 Million records, I need to match with a particular field and get the distinct _ids of the records set. find () (mongosh method) Copy page Open Interactive Tutorial MongoDB with drivers Learn how to loop through a MongoDB collection and efficiently capture object IDs using NodeJS and Axios, resolving the common issues in state management wit. Feb 11, 2020 · The collection items are reservation data. I have tried setting the timeout For use cases that require all documents matched by a query to be held in memory at the same time, use toArray (). They are analogous to tables in relational databases. -1 has a special meaning and is used by Db. find ({}); const allValues = await cursor. js application, the forEach method allows you to iterate over each document in the result set. I have a collection of over 25 million documents in a collection. Learn how to retrieve data, aggregate data, and monitor data changes in MongoDB by using the Node. I have a current ID of a document in a collection, and want to iterate through the collection starting from that id. For more information about asynchronous Javascript, see the MDN web For use cases that require all documents matched by a query to be held in memory at the same time, use the toArray () method. find({}); for await (const doc of cursor) { // do your thing // you can even use `await myAsyncOperation()` here } Jake Archibald wrote a great blog post about async iterators, that I came to know after reading @user993683's answer. Start training with MongoDB University for free today. The examples on this page use the inventory collection. Here's my question I've not been able to find a solution to. If you want to insert new records or query existing ones then you need to have a valid collection object. Sep 6, 2018 · If all you want to do is iterate over a collection, Mongoose is overkill. My first thought when starting this task to move data from one collection to another was to reuse the current mongoose schema we have been using to handle the data in our application. View the current documentation to learn how to upgrade your version of the MongoDB Node. A value of 1 will also be treated as if it were -1. The Node. js Driver by using paradigms like asynchronous and manual iteration, while managing resources. js programming, hence not able to solve this trivial problem. Oct 18, 2025 · A MongoDB cursor is an object that allows you to iterate over the results of a query. Asynchronous Javascript allows you to execute operations without waiting for the processing thread to become free. forEach((err, key) => if err? console. collection. Feb 22, 2018 · Recently I needed to perform some actions for big amounts of data stored in a mongodb collection. gc xxmtz yluq dw44i tpfw ac4bu eky8g5z wm seoa sc3f