How to check whether user is present in the database or not using Angular

I stuck in writing the logic to check whether the user presents in the database or not...

Here I am sharing the important information regarding my problem for better understanding.

1. My API Link :

http://localhost:8081/Metadata/api/user/IsValidUser

1. Postman, post JSON request

{

"Contact_No" : 9876543210,
"Password" : "pass@12345"
}


Here in postman, I am writing the data manually. but for actual data, I have created the login form in angular 3. Now it will check the above data is present in the database or not. If present then I will get the below information.

Login screen screenshot

{
"program": null,
"version": null,
"dateTime": null,
"success": true,
"errorCode": null,
"errorMessage": null,
"message": "User Authenticated Successfully",
"data": {
"mobile_No": 9876543210,
"isValid": true,
"pSNL": {
"first_Name": "First",
"middle_Name": "",
"last_Name": "Buyer",
"address": null,
"village": "Airoli",
"taluka": "Thane",
"district": "Thane",
"state": "Maharashtra",
"pincode": 400708,
"email": "test@test.com",
"dob": "06-01-1999"
}
}
}

1. I wrote the service in angular, but I think its required password parameter as well I am a little confused here. Like how to write a Post request with two parameters.

IsValidUser(validUser : IsValidUserModel){
console.log("Calling IsValidUser API " + validUser.Contact_No);
return this.http.post("/Metadata/api/user/IsValidUser", validUser)

}

1. IsValidUserModel.ts

export class IsValidUserModel {

Contact_No: number
Password: string
}


Now let me summarized my query, All I want to make check whether the user is present or not in the database. But I am confused about how to do the implementation. Can anyone suggest to me the best way to implement my problem or how to tackle the type of challenge in angular? I hope my question is clear.

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