Curl command with json parameters example. Sep 3, 2021 · cURL PUT request guide with the most common examples and a description of what each command sample does. Case of a web form with binary data When you use a file upload in the form, you use the multipart/form-data encoding instead, which has a different format. Like you can ask curl to switch on verbose mode with the -v Dec 19, 2023 · To post JSON data using Curl, you need to set the Content-Type of your request to application/json and pass the JSON data with the -d command line parameter. The server connection is verified by making sure the server's certificate contains the right name and verifies successfully using the cert store. Dec 7, 2023 · This article provides 12 practical examples of using the Curl command-line tool, with a brief description of each Curl example. For requests with JSON content, the header should be Content-Type: application/json. The response bodies are printed to standard out, which is fine, but I can't see from the man page how to get curl to print the Sep 17, 2008 · The cURL tutorial on HTTP Scripting is also helpful for emulating a web browser. Learn how to send HTTP requests with query parameters using cURL, including URL encoding, special characters, and advanced techniques. Curl automatically selects the HTTP GET request method unless you use the -X, --request, or -d command-line option. Jul 4, 2025 · Use the curl command to send POST requests to a web or application server. Download the newest version of Postman, make any http request configuration as you wish at user interface level (post, put, get. curl supports over two hundred different options. For POST requests with a body, do not include the --request POST command-line argument, since it is the default when the request includes a body. g. Basically I want to set a "GET" request to a remote REST service which gives me json data as a response via curl. Variables This concept of variables for the command line and config files was added in curl 8. May 9, 2025 · cURL is a highly versatile command-line tool for interacting with HTTP APIs. Mar 3, 2016 · Here is an api on my server: https://server/api/v1/products?filter[name]=foo this works well when I access it via browser, and it works well with the following two The command-line options mentioned above all require that you provide properly encoded data, data you need to make sure already exists in the right format. After that you can run the curl command as indicated. curl -d home=Cosby -d favorite flavor=flies would generate a post chunk that looks like the above. While that gives you a lot of freedom, it is also a bit inconvenient at times. Jul 14, 2023 · To make a GET request using Curl, run the curl command followed by the target URL. We can also use cURL in PowerShell, but there are a few important things that you need to know. A particularly useful yet sometimes overlooked feature is its ability to pipe data to POST requests directly. Sep 26, 2025 · Learn how to handle and send JSON with cURL using files, inline data, environment variables, and jq. With libcurl, use the curl_formadd() function to build your form before submitting it in the usual way. The simplest form of a cURL command is: curl [options] [URL] Options in the cURL command can control aspects such as headers, request method, data, etc. Dec 22, 2015 · Note that you do have to provide the path to a curl executable, or at least specify curl. Dec 6, 2022 · The link I gave was for curl, so it's supposed to work. for instance, with headers and json body ) and then click in "generate code" and choose "curl" option. A comprehensive guide for developers working with REST APIs. Real examples for Slack & Google Translate You can use multiple --json options on the same command line. Otherwise, perhaps curl doesn't like the certificate for some reason. It turns out the reason is the MTU size gap between VM interface and host interface. curl sends the stored cookies which match the request to the server as it follows the location. Then you need to put quotes around the string when you pass it to curl on the command line. The test-server (URL see comment, to be deleted later to avoid bots) uses a certificate that goes via Let's Encr Sep 27, 2022 · The curl command inside WSL2 hangs for some domains (like youtube. It gives you the equivalent command line. Learn about its limitations and alternatives for viewing full HTTP requests. In Spring, when you use @RequestParam, the query parameters are passed in the URL itself, not as JSON in the request body. Apr 30, 2025 · Make sure to include a Content-Type header if the request includes a body. Command line options When telling curl to do something, you invoke curl with zero, one or several command-line options to accompany the URL or set of URLs you want the transfer to be about. Learn more. But it returns no output. ) Explicitly sending the output to stdout seems a bit redundant, since that's the default anyway. This tutorial provides step-by-step instructions on how to create a Jenkins job that accepts parameters from the command line, and how to use those parameters to trigger the build of a project. Short options Command line options pass on information to curl about how you want it to behave. I can't upgrade to version 3 and most examples I've found use version 3. Jul 23, 2025 · Curl is a command-line tool for making web requests, often used directly from the terminal. you have way too many things double quoted, which ends up not quoting very much. Append this option to any ordinary curl command line, and you get libcurl-using C source code written to the file that does the equivalent of what your command-line operation does. Tagged with curl, api, beginners, webdev. For example, curl -L ip. In this article, we will learn how to make REST API requests using Curl. cURL is a computer software project providing the libcurl library and curl command-line tool for transferring data such as downloads and uploads using various network protocols. A user sets a variable to a plain string with --variable varName=content or from the contents of a file with --variable varName@file where the file can be stdin if set to a single dash (-). Adding HTTP Headers Feb 7, 2025 · Interacting with web services and APIs is a vital skill for developers, system administrators, and anyone who needs to retrieve data from the internet. Aug 19, 2020 · From: rafa via curl-library <curl-library_at_cool. Any number of variables can be Nov 14, 2024 · The command-line tool cURL (client URL) is commonly used to send or receive data to a server. Jul 23, 2025 · Using the "-d" or "--data" option in CURL Command One of the simplest way to post JSON data with cURL using the '-d' or '--data' flag followed by the JSON payload enclosed in single quotes. Learn how to use curl to build a Jenkins job with parameters. This header should appear after the authentication headers. ba3a. I tried to ping the URL directly from the browser, I am able to get response successfully, I don't understand what is the wrong with the command. Issue man curl and read about -d switch. I want to test my Spring REST application with cURL. I am trying to post a JSON d Aug 22, 2014 · I'm not sure if this is possible, but i am trying to curl a post, but with a json as the parameters, like such: Mar 16, 2025 · Append this option to any ordinary curl command line, and you get libcurl-using C source code written to the file that does the equivalent of what your command-line operation does. so you’d want to do serviceBranchJson= then the url encoded the json. csv' Alternative solution: You can use the Apr 7, 2015 · If you are running curl directly from the command line, you have several options, one of which is to type up the function in a new file and then at the command line run source my_new_file to define the function in your current environment. --data-raw is almost the ter. Jul 31, 2025 · How to Post JSON Data Using cURL CURL is a standard command-line tool for API testing, the question arises: How can one send JSON data using a cURL command? This article guides you through the process of POSTing JSON data using the cURL command. 3. And PowerShell also has it’s own methods to transfer data to and Nov 26, 2024 · Send GET requests with curl. JSON data is passed as a string. Can anyone guide me what mistake am I doing? Dec 6, 2024 · Learn how to effectively send JSON data using curl, including command-line techniques and file-based approaches for API interactions. com. Jun 9, 2023 · Read this article to learn sending simple cURL GET requests or with parameters effortlessly. Most of the examples given can be done right in the browser using the ReqBin Online Curl Client. Jan 8, 2025 · Explore how to send GET requests with cURL. If I just echo the variable 'curlData' that I use in the curl command I Dec 28, 2023 · This article explains how to use curl to make POST requests. 12 Dec 8, 2012 · Quick Answer: In a single line, the curl command would be: If sending form data: curl -X PUT -H "Content-Type: multipart/form-data;" -F "key1=val1" "YOUR_URI" If sending raw data as json: curl -X PUT -H "Content-Type: application/json" -d '{"key1":"value"}' "YOUR_URI" If sending a file with a POST request: curl -X POST "YOUR_URI" -F 'file=@/file-path. To add additional HTTP headers, use the -H command line option. However, I want to test it with cURL. Essentially, Curl prints the web response to the terminal. Apr 26, 2010 · Is there a way to install cURL in windows in order to run cURL commands from the command prompt? Jul 28, 2023 · curl: (35) schannel: next InitializeSecurityContext failed - The revocation function was unable to check revocation for the certificate Ask Question Asked 2 years, 4 months ago Modified 3 months ago I'm using curl at the command line on Linux to issue HTTP requests. -d, --data <data> (HTTP) Sends the specified data in a POST request to the HTTP cause curl to pass the data to the server using the content-type -d, --data is the same as --data-ascii. I'm trying to perform the following: curl -X GET \ -H "X-Parse-Application-Id: 12345_Example" \ -H "X-Parse-REST-API-Key: abcde_Example" \ -G \ --data-urlencode "where= { \"pin\":\"A string If curl is given multiple URLs to transfer on the command line, it similarly needs multiple options for where to save them. curl -H "Authorization: Bearer access_token_goes_here" \ For example you want to set the user-agent field curl uses to be exactly I am your father, including those three spaces. The tool’s advantage is that it supports multiple protocols and offers features like authentication, proxy, transfer resume, and more. The exact quotes to use varies depending on your shell/command prompt, but generally it works with double quotes in most places: Feb 10, 2023 · Learn how to use curl to make quick and easy REST API requests from the command line in this beginner-friendly guide. Sep 7, 2023 · This page contains a comprehensive curl command-line reference and guide based on the Mastering the Curl Command Line master class as well additional usage notes and examples on using curl. Then I'd suggest you add "--trace-ascii log. In this tutorial, we’ll use the REST APIs from httpbin. : curl Jan 19, 2024 · To send JSON data to the server using Curl, you need to pass the Content-Type: application/json HTTP header with the -H command line argument and the JSON data with the -d (or --data) command line argument. Mar 24, 2021 · Whenever your have a doubt use man. 3 days ago · On the command line with curl, this gets generated with the -d flag, e. May 18, 2019 · Arguments containing spaces will not properly pass to the curl command. The target URL is passed as the first command-line option. It does no encoding or decoding, unless explicitly asked to with dedicated command line options. txt" to both command lines and compare the logged data and see how they differ in what curl sends. In this guide, Feb 7, 2022 · If you’re using CLI tool curl to retrieve data from a remote API, you might send forth a command like so. This functionality proves invaluable for dynamic scripting, handling streaming inputs, and creating command pipelines within shell environments. You need to escape anything that goes into a url that isn’t letters or numbers. Jul 11, 2025 · Lastly, understanding the command line in Linux is essential to maximize efficiency and effectiveness in using the system, with `curl` being an outstanding tool due to its flexibility and robust data transfer capabilities across various protocols. Perhaps you could force it with the curl parameter --cacert file or --cert. May 17, 2025 · Previously it worked but since I rarely test this server, I don't know what changed. I found a lot of examples on how to use simple POST commands in cURL, but I didn't find examples on how to send full HTTP POST commands, which contain: Headers (Basic Authentication) HTTP Params (s Nov 20, 2025 · Many APIs will accept both formats, so if you're using curl at the command line, it can be a bit easier to use the form urlencoded format instead of json because Oct 1, 2024 · To resolve the issue where params is coming as null, it's important to understand that the curl command you're using with GET is likely not correctly formatting the query parameters. Curl examples include sending a JSON file to a server, submitting a web form, user authentication, proxy support, saving the server response to disk, and more. Dec 19, 2023 · To post JSON data using Curl, you need to set the Content-Type of your request to application/json and pass the JSON data with the -d command line parameter. Find out how to retrieve JSON data and the main request arguments. The JSON content type is set using the -H "Content-Type: application/json" command line parameter. What I may be missing? Apr 12, 2022 · That is absolutely not a valid curl command. Jan 31, 2023 · Occasionally I want to POST human formatted JSON with curl, here's how to do that without using shell hacks or temp files. Mar 28, 2021 · (curl -o- and curl -o - act the same. This guide details the simple steps with typical scenarios like passing parameters, headers, and JSON responses. Nov 15, 2024 · Dive into the intricacies of sending POST requests with cURL, a versatile command-line tool for transferring data, and explore advanced authentication methods and data handling techniques. curl does not parse or otherwise "understand" the content it gets or writes as output. This cheat sheet will guide you through its most common commands. Sep 13, 2023 · Use curl to interact with websites directly from your command line. exe; curl by itself is a Powershell alias for the Invoke-WebRequest cmdlet, which can do most of what the cURL program can do but has very different argument syntax. Sep 10, 2017 · When JSON file content is sent by curl, all carriage returns and newlines will be stripped out -- it would still be a valid JSON but server may not be able to recognize. A variable in this context is given a specific name and it holds contents. com). Quotes are not passed correctly in the --data field. 0 doesn't have the useful cmdlet Invoke-RestMethod. se> Date: Wed, 19 Aug 2020 21:07:54 -0300 What I want to do is to perform CURL request with parameters and values by using GET method but using JSON. However, the man page does mention using multiple -o options for multiple URLs to download, so it might be more useful in that context. Jul 24, 2014 · Scenario Among other things, Powershell 2. This Curl cheat sheet contains commands and examples of some common Curl tricks. I use Ubuntu and installed cURL on it. The HTTP POST method is used to send data to the remote server. To post data purely binary, you should instead use the [] It allows you to send ASCII data, eg. org to Dec 10, 2008 · There is a good way to learn how to use curl for http requests by examples. Jan 30, 2019 · `curl -v` displays HTTP headers but not the complete request body. tech fetches IP address details in JSON format, just like visiting the site in a browser. This guide shows curl POST examples and use cases. I wrote my POST code at the Java side. May 11, 2018 · > are supplied in JSON form on the command line (they do work if you put the > JSON credentials in a file and then supply it to curl using the form > @filename). One of the most versatile and powerful tools for this purpose is cURL. com) and it runs well for other domains (like google. Can you send the same content (with carriage returns and newlines) through Postman and check again? Is there any API document? Dec 7, 2017 · This option allows curl to proceed and operate even for server connections otherwise considered insecure. 0. . haxx. I have found this article, Dec 3, 2023 · How to send a POST request using Curl? You can send a POST request with Curl by explicitly specifying the POST method with the -X POST command line parameter or passing data to Curl using the -d or --data command line parameter. This makes curl concatenate the contents from the options and send all data in one go to the server. Learn to pass parameters and parse JSON responses step-by-step. Feb 1, 2024 · Understanding cURL Syntax Before we add headers and parameters, let’s understand the basic syntax of cURL. In the above command, curl parses the header and store the cookies received from www. Here In jenkins, that job has a configured string "PARAMETER" with or without some default value, but never the parameter from the curl launch is passed. This means the --data option should not be used in this context for a GET request.