What are the Error Codes in API

When you use applications like Twitter, Facebook, or send a direct instant message or check weather status on the phone, you use the API. What exactly is API?

It is an Application Programming Interface that acts as an intermediate software to connect the two applications. Every other minute we need our phones to connect with our colleagues, family, friends, and stay up to date.

Our lives revolve around the smart screens, and the last thing we want is to witness an error in API response. You may encounter an error code in API response because either the API had problems or the request for handling API does not pass the data. Let’s discuss the error codes in API and how you can solve them to work smoothly. Check error guides here errorcodeshero.com.

API Error Codes

1XX – Informational Response

There are two functionalities of the 1XX range. The first one corresponds to the transfer of information that pertains to the connected devices protocol state. For example, the 101-switching protocol is the status code notifying the client about protocol change in the server, with an approved request.

The other 1XX range refers to the state of the initial request clarification like 100 continue that sends information that the server received the request from the client. It also includes the information that the server awaits the request body.

2XX – Success

The 2XX range refers to the range of successes during communication, including the packages of specific codes. In this error code, three status demonstrates the range; including 200 OK meaning success of POST or GET request.

While the 201 Created code confirms the fulfillment of request and that a new resource is created for the client. Lastly, the 202 Accepted code refers to an approval of application along with the start of processing.

3XX – Redirection

The 3XX range accounts for the status of the resource or endpoint that means the server accepts communication, but the contacted point is not the correct for system entry.

The 301 Moved Permanently verifies an approval request in the correct system, and a different URI system handles the request.

4XX – Client Error

The series of 4XX error codes are among the most known and iconic ones, including the 404 Not Found status. It consists of the marker for URIs and URLs that are not formed properly.

The 414 URI Too Long is the status code that denotes the data is pushed in the GET request, but it took a long time; therefore, it should be converted to POST request.

Similarly, 429 Too Many Requests is a common code that limits the rate of client attempts in sending too many requests at a time. Therefore, the error rejects the traffic requested by the client.

5XX – Server Error

The 5XX range is for the error codes specific to the server functionality for the note failures in the server.

The 502 Bad Gateway error code accounts for the upstream server failure, and is also the current server works as a gateway, exposing server functionality to an error. However, the 503 Service Unavailable error codes are less specific and are general failures in the communication.

Use of http:// instead of https://

When you are testing an API code, be careful to use https://, because if you forget a single ‘s,’ it can cause trouble. It affects the traffic and framework of your status codes, and cause problems in the following redirects to the POST.

Invalid Error Code

The API error messages often allow the developers to find the answers to the how and why of the failed request and fix it. However, they may also cause an increase in denial requests suggesting it was an invalid one.

Invalid Authorization Credentials

The API requires an authorization header from the developer, for instance, PayPal. Often users confuse that with ‘authentication,’ therefore make sure that you request the correct authorization header to constructs the client demand.

When you use the HTTP basic authentication, make sure to use the correct syntax header. Ensure that you use the ‘basic’ prefix with proper encodes to the username and password.

It is important to you consider to rate limits to the policies to,

  1. Protect the API from service attack denials and severe spikes in traffic
  2. Limits the number of API application calls made on the fixed specified duration


The API error codes require precision and accuracy in the request; otherwise, they may lead to severe errors leading to a denied request and traffic problems. Make sure that you use the correct method while connecting with an API application to minimize errors.