Rest call from javascript

JavaScript Implementation of REST API Calls

How can I retrieve data from OpenMRS using JavaScript? Specifically, I am developing a simple HTML application and need to call the OpenMRS REST API. For reference, I am also utilizing the HBase REST API in my application.

How to call REST API from javascript

There is a web address that provides json data.

When attempting to access the URL from JavaScript, an error is being encountered.

The declaration of the encoding of the plain character text document was not done, which could cause rendering issues in some browser configurations if the document has non-US-ASCII characters. To avoid this, either declare the character encoding in the transfer protocol or include a byte order mark as an encoding signature in the file.

Are you in the process of creating a fully qualified URL call ?

Ensure the following if you are placing a call that is entirely qualified URL.

1. It is not possible to make a simple JSON call to a different domain, as you are calling the same domain (server).
2. To perform a cross domain call, employing JSONp is necessary.

An update has been provided that indicates the current approach is unsuccessful due to it being a call across different domains.

Server side

Enclose your data in function syntax on the server side.

getMyData("Enter your data here"); 

Generate an script tag and incorporate a hyperlink to your cross-domain webpage.

An alternative solution involves generating a proxy within your domain. This means creating a webpage on your domain that can access the cross-domain page and subsequently send back the requested information to your Ajax call.

How to call a REST web service API from JavaScript?, Since you are doing a synchronized call, you need to call xhttp.open («POST», «Your Rest URL Here», false);, otherwise xhttp.responseText will not contain the result. But as said before, it will be soon deprecated. – Alexandre Fenyo Jan 31, 2018 at 9:39 If this is a POST request, where are you actually posting the data? – EFC May 15, 2018 at 18:47 Code sampleURL = «https://testrestapi.com/additems?var=» + urlvariable;var xmlhttp = new XMLHttpRequest();xmlhttp.onreadystatechange = callbackFunction(xmlhttp);xmlhttp.open(«POST», URL, false);xmlhttp.setRequestHeader(«Content-Type», «application/json»);Feedback

Using Javascript to call a REST API [duplicate]

At present, I am developing a simple HTML program that utilizes JavaScript to contact a specific REST API (to clarify, it is the HBase REST API). However, my current attempt at contacting it does not yield a suitable response. Specifically, it returns a response code of 0, which is not a valid code but rather a blank response, along with an empty statusText and responseText.

When faced with this type of response, I would typically assume that the issue lies with the URL. Consequently, I display the URL, which, in this case, is http://hbase_server.com:8080/table_name/key .

After executing curl -i http://hbase_server.com:8080/table_name/key , I received the response I was hoping for, confirming that my URL is correct. This means that the issue must lie with my request. Below is the code I used, though I must admit my lack of experience with JavaScript may have led to some mistakes.

function sendRequest() < var key = document.getElementById("Key").value; var url = "http://hbase_server:8080/table_name/" + key + ""; var req = new XMLHttpRequest() // Create the callback: req.onreadystatechange = function() < if (req.readyState != 4) return; // Not there yet if (req.status != 200) < document.getElementById("result").innerHTML = "Status: " + req.statusText; return; >// Request successful, read the response var resp = req.responseText; document.getElementById("result").innerHTML = resp; > req.open("GET", url, true); req.send(); document.getElementById("result").innerHTML = url; > 

The data cannot be retrieved using XHR if the requesting page is not on the same domain or if the server does not set the necessary CORS headers, as per the same-origin policy.

Check the browser’s developer console to determine if any errors are associated with this issue.

You’re experiencing the «Same-origin policy», which occurs when your client restricts your code from making requests to a URL that has a different domain than the one where the code was loaded from (i.e. localhost).

Jquery — how to call REST API from javascript, JavaScript Create a function function getMyData (data) < alert (data); //Do the magic with your data >Server side On server end wrap your data inside function syntax getMyData («Enter your data here»); JavaScript Then create a script tag and add a link to your cross-domain page

How to make http authentication in REST API call from javascript

To retrieve data from OpenMRS, it is necessary to contact the OpenMRS REST API through java script. The following is an example of JavaScript code that can be used for this purpose.

The YWRtaW46QWRtaW4xMjM refers to my base64 encoded username and password, which can be found in the explanation. When I omit the authorization line and use Firebug to check the web app, it gives a 401 unauthorized status as expected. However, when I include the authorization, there is no response and Firebug does not show any data. If I access the URL directly in the browser, it prompts for login details and returns the data after correct credentials are provided. Therefore, I am facing difficulty in providing http authentication through the app’s javascript. I have tried the methods described here, but with no success. Could someone please assist me in authorizing the http request through javascript?

This is an alternative example that demonstrates how to configure the authorization header, but utilizing JQuery and AJAX instead.

var token = "xyz" var url = "http://localhost:8081/openmrs-standalone/ws/rest/v1/person?q=John" $.ajax(< url: url, beforeSend: function(xhr) < xhr.setRequestHeader("Authorization", "Bearer " + token) >, >) .done(function (data) < $.each(data, function (key, value) < // Do Something >) >) .fail(function (jqXHR, textStatus) < alert("Error: " + textStatus); >) 

Here’s an instance where you can obtain an access token through xhr, rather than using AJAX.

var data = "grant_type=password&username=myusername@website.com&password=MyPassword"; var xhr = new XMLHttpRequest(); xhr.withCredentials = true; xhr.addEventListener("readystatechange", function () < if (this.readyState === 4) < console.log(this.responseText); >>); xhr.open("POST", "https://somewebsite.net/token"); xhr.setRequestHeader("cache-control", "no-cache"); xhr.setRequestHeader("client_id", "4444-4444-44de-4444"); xhr.send(data); 

Take caution when making cross-site domain requests, particularly if you’re requesting a token from a domain other than localhost or the one you are currently working in. In such cases, you’ll require CORS. If you encounter a cross-domain problem, refer to this tutorial for assistance and ensure that you also have enabled CORS requests from the API.

Using Javascript to call a REST API, May 24, 2016 at 11:43. For this to work you need to call the rest from the same domain and port: http://hbase_server.com:8080, e.g. the call should be var url = «/table_name/» + key + «»; or implement CORS on the server (search for «CORS javascript») – mplungjan. May 24, 2016 at 11:43. Add a comment.

How to make rest API call in Javascript [duplicate]

As a beginner in Javascript and rest API, I am creating a basic ecommerce platform that enables sellers to showcase their products to potential buyers. To serve this purpose, I am utilizing paypal connected account as a payment processing platform.

According to the Paypal website, a link is provided for calling the REST API.

On the signup page, I have incorporated the PayPal logo. When clicked, I wish to trigger the API.

they gave two steps on the page

 Sample Request curl -v -X POST https://api.sandbox.paypal.com/v1/customer/partner- referrals \ -H "Content-Type: application/json" \ -H "Authorization: Bearer Access-Token" \ -d 

This function serves as the handler for clicking on my PayPal logo.

Get the format for sample customer data from the PayPal website.

Despite my attempt to consult the tutorial, I could not glean sufficient information from it. Can you guide me on how to utilize the PayPal REST API to make calls for a connected account using JavaScript?

In your click handler, an AJAX call should be possible, for instance:

$('#paypal_img').click(function() < $.ajax(< type: "POST", url: , data: < // Data goes here >, beforeSend: function(xhr) < xhr.setRequestHeader("Authorization", "") >, success: function(data) < // Handle response data here >, error: function() < // Handle errors here >, dataType: 'json' >); >) 

To ensure safety, it might be better to make the PayPal call on the back-end instead of the front-end. By doing so, you can avoid exposing too much information to the client. Simply make a normal AJAX call to initiate the process on the front-end, and let the back-end handle all the credential handling and other necessary tasks.

How to make http authentication in REST API call from, I need to call OpenMRS REST API from Java script to get data from OpenMRS. Below is my java script code: function myfunction()< var xhr = new XMLHttpRequest(); xhr.open("GET", "http:// Stack Overflow

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Вызов REST API из JavaScript

В современном веб-разработке часто возникает потребность в использовании REST API — это способ, который позволяет веб-сайтам и веб-приложениям обмениваться данными с сервером. Например, возникает потребность отправить данные из формы на веб-странице на сервер или получить данные с сервера для отображения на веб-странице.

JavaScript предлагает несколько методов для взаимодействия с REST API, но самым популярным и широко используемым является метод fetch(). В данном контексте fetch() представляет собой функцию, которая позволяет осуществлять асинхронные HTTP-запросы к серверу и работать с REST API.

В базовом случае использования fetch() для отправки GET-запроса к REST API код будет выглядеть следующим образом:

fetch('https://api.example.com/items') .then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error('Ошибка:', error));

В этом коде вызывается fetch() с URL-адресом REST API, затем обрабатывается ответ от сервера и преобразуется в JSON, и затем выводится полученные данные.

Для отправки POST-запроса с данными код будет немного сложнее:

let data = ; fetch('https://api.example.com/items', < method: 'POST', headers: < 'Content-Type': 'application/json', >, body: JSON.stringify(data), >) .then(response => response.json()) .then(data => console.log(data)) .catch((error) => < console.error('Ошибка:', error); >);

В этот код добавлены дополнительные опции для метода fetch(), указывающие на использование HTTP-метода POST, добавление заголовка ‘Content-Type’ и отправку данных в формате JSON.

Описанные здесь примеры являются базовыми и могут быть дополнены и модифицированы в соответствии с требованиями конкретного REST API и задач, стоящих перед разработчиком.

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Call a REST API from JavaScript

So to get started first we need an API to call. If you already have an API to use you can skip forward to the next step. Using the form below you can quickly set up a mock JSON API that we will use in this tutorial. Simply paste some JSON into the text field and press Create API to get started. In this tutorial we will use the following response body that you can use if you are out of ideas:

Free API Editor

If you want to create a simple API for testing purposes, simply enter a response body below and press Create API to get your custom API URL.

Use Mocki to create a fully fledged mock API. Sign up for a 7-day free trial and get:

• Multiple API endpoints
• Monitoring dashboard
• Simulated errors and delays
• Generated test data

When you have pressed the button you should get a URL to your API. Make sure to save it so that we can use it later on.

Note: If you want to use more advanced features such as setting response headers, adding multiple endpoints and much more simply sign up here to create your mock API. If you want to create a real API with dynamic responses we recommend using a SaaS Boilerplate.

2. Getting started 🚀

To get started we need to create a file that we can write some code in. Create a new file in your favorite text editor, add the code below and save it as index.html .

3. Use fetch to call the API 🐕

In JavaScript the easiest way to call an API through HTTP is to use the fetch library. This is included in all major browsers. Let’s edit our index.html to use it!

The following code will execute a GET call to our API and show the result inside the tag. Open your index.html file in Chrome to check out the result.

 
response.json()) .then(json => data.innerHTML = JSON.stringify(json)); 
 
As simple as that! In the next step we will try a POST request.
 
4. Make a POST request ✉️
 
A GET request is usually made when fetching data from the API. If we want to create something through an API a POST request is used. We can easily modify our usage of the fetch library to make our request into a POST.
 
 
) .then(response => response.json()) .then(json => data.innerHTML = JSON.stringify(json)); 
 
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