"Using Curl to make REST API requests"

“Using Curl to make REST API requests”

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"Using Curl to make REST API requests"

We hope this post helped you to find out "Using Curl to make REST API requests"

An software program interface (API) is a set of definitions and protocols that enables software program applications to speak with one another.

The time period REST stands for representational state switch. It’s an architectural type that consists of a set of constraints for use when creating net providers.

RESTful API is an API that follows the REST structure. Usually REST APIs use the HTTP protocol for sending and retrieving knowledge and JSON formatted responses. You should use the usual HTTP strategies to create, view, replace, or delete sources by means of the API.

To check and work together with the RESTful APIs, you need to use any library or instrument that may make HTTP requests.

API requests are made up of 4 completely different elements:

• The endpoint. That is the URL that the consumer makes use of to speak with the server.
• The HTTP methodology. It tells the server what motion the consumer needs to carry out. The commonest strategies are GET POST PUT DELETE and PATCH
• The headers. Used to go further data between the server and the consumer, reminiscent of authorization.
• The physique. The info despatched to the server.

On this article, we’re going to debate methods to use curl to work together with RESTful APIs. curl is a command-line utility for transferring knowledge from or to a distant server. It’s put in by default on macOS and most Linux distributions.

Curl Choices #

The syntax for the curl command is as follows:

Listed below are the choices that we’ll use when making requests:

• -X, --request – The HTTP methodology for use.
• -i, --include – Embrace the response headers.
• -d, --data – The info to be despatched.
• -H, --header – Further header to be despatched.

HTTP GET #

The GET methodology requests a selected useful resource from the server.

GET is the default methodology when making HTTP requests with curl. Right here is an instance of constructing a GET request to the JSONPlaceholder API to a JSON illustration of all posts:

curl https://jsonplaceholder.typicode.com/posts

To filter the outcomes use question params:

curl https://jsonplaceholder.typicode.com/posts?userId=1

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HTTP POST #

The POST methodology is used to create a useful resource on the server. If the useful resource exists, it’s overridden.

The next command will create a brand new submit utilizing the info specified with the -d possibility:

curl -X POST -d "userId=5&title=Hello World&body=Post body." https://jsonplaceholder.typicode.com/posts

The kind of the request physique is specified utilizing the Content material-Sort header. By default when this header just isn’t given curl makes use of Content material-Sort: software/x-www-form-urlencoded

To ship a JSON formatted knowledge set the physique kind to software/json:

curl -X POST -H "Content-Type: application/json" \ -d '{"userId": 5, "title": "Hello World", "body": "Post body."}' \ https://jsonplaceholder.typicode.com/posts

HTTP PUT #

The PUT methodology is used to replace or exchange a useful resource on the server. It replaces all knowledge of the required useful resource with the request knowledge.

curl -X PUT -d "userId=5&title=Hello World&body=Post body." https://jsonplaceholder.typicode.com/posts/5

HTTP PATCH #

The PUT methodology is used to make partial updates to the useful resource on the server.

curl -X PUT -d "title=Hello Universe" https://jsonplaceholder.typicode.com/posts/5

HTTP DELETE #

The DELETE methodology removes the required useful resource from the server.

curl -X DELETE https://jsonplaceholder.typicode.com/posts/5

Authentication #

If the API endpoint requires authentication, you’ll have to acquire an entry key. In any other case, the API server will reply with the “Entry Forbidden” or “Unauthorized” response message.

The method of acquiring an entry key will depend on the API you’re utilizing. Upon getting your entry token you possibly can ship it within the header:

curl -X GET -H "Authorization: Bearer {ACCESS_TOKEN}" "https://api.server.io/posts"

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Conclusion #

We’ve proven you methods to use curl to make take a look at API requests. For extra details about curl, go to the Curl Documentation web page.

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