how to integrate salesforce with MongoDB without any tools??'

Most of  MongoDB to Salesforce integration practice is about making custom REST API solutions to access mongoDB JSON files, and pull,push, or delete data from Salesforce databases.

Here are some steps to integrate it(MongoDB) with SalesForce.

1.Authentication

This step involves authenticating yourself for accessing MongoDB databases, and also Salesforce databases, if you are planning a migration that is. Yes, pretty basic stuff.

• 2.Using MongoDB API for data access:
• MongoDB uses its own ‘Database format’, BSON, which is a modified form of JSON. Though database format is not strictly an accurate term for BSON but for simplicity we can use the same as long as it serves the purpose.MongoDB has its own set of APIs to access its BSON data. For accessing the databases you would basically need a JavaScript program that can use MongoDB BSON HTTP interfaces to pull and if required, push and delete data collections, or documents, or data etc. As said it is a custom program, hence no plug-and-play solution.

• 3.REST API solution for accessing the salesforce.
• Now once you have retrieved the MongoDB data, you will have to create you own REST API solution to push that data into Salesforce interface or Salesforce database.