bcrypt note

Author: rohan-paul

MongoDB/insert-data-into-mongodb-collection.md

@@ -0,0 +1,54 @@
+### How to insert data into a mongodb collection directly from the Terminal
+
+Say my user scheme is as below
+
+```js
+var UserSchema = new Schema({
+  username: {
+        type: String,
+        unique: true,
+        required: true
+    },
+  password: {
+        type: String,
+        required: true
+    }
+});
+
+```
+
+And running ``db.users.find().pretty()`` gives me the below result in terminal
+
+```
+{
+	"_id" : ObjectId("5ba8da81e3a25304ea9ce7ad"),
+	"username" : "rohanpaul4@gmail.com",
+	"password" : "$2a$10$7qIhU76cIf7rlvWCGu7bZONAuuumxRpUKxj4.nh8AdghYWlYxCzGO",
+	"__v" : 0
+}
+{
+	"_id" : ObjectId("5bab490ef58260136c4dc6fe"),
+	"username" : "r@gmail.com",
+	"password" : "$2a$10$HyXCD5.4U/0CvZHq9SDQ0uxD12BQ46yVAHu18lRRVEQZB3uyHXgy.",
+	"__v" : 0
+}
+
+```
+
+### Now to add a new document (i.e. record ) into this users collection run the below in terminal
+
+```
+db.users.insert(
+{
+"username" : "p@gmail.com",
+"password" : "$2a$10$HyXCD5.4U/0CvZHq9SDQ0uxD12BQ46yVAHu18lRRVEQZB3uyHXgy.",
+"__v" : 0
+}
+)
+```
+
+#### Note, I dont have to provide a separate _id field as mongodb will generate that by itself
+
+And the part "$2a$10$HyXCD5.4U/0CvZHq9SDQ0uxD12BQ46yVAHu18lRRVEQZB3uyHXgy." is what I generated a hashed version of a plaintext password using the online tool [https://bcrypt-generator.com/](https://bcrypt-generator.com/) . Because in my actual app (where this was implemented) I used bcrypt to hash the password.
+
+But I could very well used "123"  in the mongo shell.

Node-Express/bcrypt-How-it-works.md

@@ -1,4 +1,4 @@
-## Fist, What is password hashing?
+## Fist, What is password hashing - its the below kind of transforming.
 
 hash("hello") = 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
 hash("hbllo") = 58756879c05c68dfac9866712fad6a93f8146f337a69afe7dd238f3364946366
@@ -190,5 +190,22 @@ bcrypt.compare = function(s, hash, callback, progressCallback) {
                 });
             });
     };
-    ```
+
+```
+
+### Online bcrypt hashing and de-hashing generator and checker
+
+[https://bcrypt-generator.com/](https://bcrypt-generator.com/)
+
+Just put the rounds (which is the salt length to generate, i.e. the function wheere I am hashing the plain-text password )
+
+``bcrypt.hashSync(plainTextPassword, 10)``  So the number 10 is the rounds in the above online tool
+
+After hashing a plaintext password, for checking I will just put the hashed password from the mongo database - i.e. after running terminal command something like ``db.users.find()`` which will give all the users saved in the mongo database.
+
+So an example is this hashed password - ``$2a$10$m0mq4PYOOvm74Gukml4FN.T0Ntobhzi42T6b5v1WIsJ5aZkVzJz3a``  And then put the round as 10 and I will get ``123`` which was my plaintext password in this case.
+
+
+
+