JSON to SQL converter

Your tech lead has just given you a task to write a Node program that converts JSON into SQL. The goal with this program is to translate every item in an array in a JSON file into individual INSERT statements, so that those items can be seeded into your SQL database.

The first use case is to convert a JSON object that contains an array of country objects (with country name and country code key-value pairs) into SQL so that they can be seeded into the countries table in your app database.

For a start, this program just needs to print all the corresponding SQL INSERT statements to the Terminal. We can then copy and paste those into an empty .sql file afterwards and run it for seeding.

For example, running this in Terminal...

$ node converter-program.js

... should convert this:

{
    "countries": [
        {"name": "Afghanistan", "code": "AF"},
        {"name": "Åland Islands", "code": "AX"},
        {"name": "Albania", "code": "AL"}
    ]
}

... to this (printed to Terminal):

INSERT INTO countries
(name, code)
VALUES
('Afghanistan','AF');

INSERT INTO countries
(name, code)
VALUES
('Åland Islands','AX');

INSERT INTO countries
(name, code)
VALUES
('Albania','AL');

Further - save to a file

Your team is growing and your tech lead wants you to improve your program so that it saves the output into a countries.sql file instead of printing it in Terminal. This helps every developer take one less step (having to copy-paste into an empty file) to seed the result into the database.

Hint: Node has an inbuilt module that handles reading and writing of data into files. It should be relatively easy to google for it!

Further - accepting user input arguments

Marketing has just spent a bunch of money acquiring a large dataset of customers and emails (not included in this repo), and it came in JSON format. They want to seed them into the customers table in your database.

So now, your tech lead wants you to generalise your program by allowing it to take in arguments from the command line to allow a user to specify:

the JSON file that needs to be converted
the name of the database table to be inserted into

The new program signature should be:

$ node converter-program.js <json_filename> <db_tablename>

# example
$ node converter-program.js customers.json customers

The output should be a output.sql file that should contain the correct table name:

INSERT INTO customers
(first_name, last_name, email)
VALUES
('Joseph','Gordon', 'levitt@example.com');

-- more ...

Hint: You can use the external module jsonfile to read/write JSON files (run yarn add jsonfile or npm install jsonfile).

jaanhio / json-to-sql-converter

JSON to SQL converter

Further - save to a file

Further - accepting user input arguments

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