How to create an API server in 30 Seconds

Philip Philip Follow Jan 18, 2019 · 2 mins read
How to create an API server in 30 Seconds
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If you need an API server for your test or development purpose, ‘json-server’ is an excellent option to get your mock data uploaded and available in no time.

Here I am listing the few simple steps to get it done. I assume you have installed node package manager (npm) in your computer.

Create a folder named ‘API Server’ or whatever name you wish to give. Open command prompt and type the following command and then press enter

npm install -g json-server

Create a file in the json-server folder named ‘db.json’ and in it create a json array

{ "people" : [ {"id": 1, "First Name": "Harry", "Last Name": "Potter"}] }

Open command prompt from the folder and type ‘json-server db.json’ Your server is up and running!

You can access it with the URL "http://localhost:3000" and the data with http://localhost:3000/people/1 etc. You can add, delete and update the data using tools like Postman or through your Automation Scripts.

You can save a snapshot of the current database by typing ’s’ and press enter in current session in the terminal. Press Control+C to end the session.

If you think the current data is not enough, there is another quick option using ‘faker js’ to create some fake data. Follow the steps below

Create a file called ‘generate-data.js’ in the folder. Open the terminal from the folder and install faker and lodash with the command

npm install faker lodash

Remember, you have to install the module in the server folder itself. Type the following code in ‘generate-data.js’ file and save it

module.exports = function() {
    var faker = require("faker");
    var _=require("lodash");
     return {
       people: _.times(100, function(n) {
         return {
             FirstName: faker.name.firstName(),
             LastName: faker.name.lastName(),
             avatar: faker.internet.avatar()

Now open the terminal from the server folder and type the command and then press enter

json-server generate-data.js

A ton of data is ready for your testing! You can be more creative if you refer to the faker.js documentation and know how to autogenerate the data with a lot of other options described there.

Note: Always remember to initialize the server from the terminal before you start using it. Open the terminal from the server folder and type ‘json-server db.json’ and you are ready to go.

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Written by Philip
Test Automation Architect/ Developer/ Lead