To convert a cURL command to JavaScript, paste it into curlconverter’s JavaScript converter, choose the right target for your runtime, then review the generated request before using it. For a request you made in a browser, copy it from DevTools with Copy as cURL first. The output is a useful starting point—not a guarantee that JavaScript will behave exactly like cURL.
Convert a cURL command to JavaScript in three steps
- Get the command. Copy the request as cURL from your browser’s Network panel, or use a cURL command you already have.
- Choose an output target. Use browser JavaScript for code running in a browser; select a Node.js or library target for server-side code.
- Review and test. Verify the method, URL, query parameters, headers, authentication and body. Compare the JavaScript result with the original cURL request, especially when redirects, compression, timeouts or uploads matter.
For browser-style Fetch code, open curlconverter.com/javascript, paste the command into the input area and inspect the generated output. The converter runs in the browser; curlconverter says it does not transmit or record the commands entered or their conversions. That does not make a copied command safe to share: it may contain session cookies or credentials.
Copy a request as cURL from browser DevTools
DevTools captures the request your browser actually made, including details that are easy to miss when recreating it by hand. The exact menu wording can vary slightly by browser version, but the documented workflow is through the Network panel’s Copy menu.
- Open the page and launch Developer Tools.
- Select the Network tab, then reproduce the action that sends the request.
- Find the relevant request in the list. Check its URL, method and timing so you do not copy an unrelated asset or preflight request.
- Right-click the request—or Ctrl-click or use a two-finger click where appropriate—and choose Copy, then Copy as cURL.
- Paste the command into the converter. Remove or replace secrets before putting the converted result in source control, a ticket, chat or documentation.
The curlconverter page documents this process for Chrome, Safari and Firefox. A copied browser request may include cookies and other sensitive headers; curlconverter advises treating a shared cookie like a password. If a live session cookie or token has already been exposed, revoke or rotate it where the service allows.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →#1 Best Overall
Choose the right JavaScript target
“JavaScript” can mean browser code or code running in Node.js. The generated syntax and the available networking APIs differ, so select the target based on where the request will execute—not just the language you prefer.
| Target | Use it when | What to check |
|---|---|---|
| Browser JavaScript / Fetch | The code runs in a web page or browser-based application. | Browser security rules, including cross-origin access, can prevent a request even if cURL works. Browser cookies and headers also depend on the browser context and request configuration. |
| node-fetch | You want the converter’s node-fetch-style output in a Node.js project that uses that package. | Use the generated import and confirm that the installed package and your Node module setup match the code. The converter’s node-fetch page emits an import for node-fetch when that target is selected. |
| Node HTTP | You want a Node-native HTTP target rather than browser Fetch or an added client library. | Review the lower-level request and response handling; it may be less concise than a higher-level client. |
| Axios, Got, Ky, Request or SuperAgent | Your project already uses one of these clients or you prefer its API. | Confirm the dependency is installed and check that its defaults and error behavior match your needs. |
| jQuery or XHR | You specifically need one of these browser-oriented styles for an existing codebase. | These are separate outputs with their own APIs; do not assume their behavior is identical to Fetch. |
The available curlconverter targets also include JavaScript, jQuery and XHR. Its repository lists node-http, node-axios, node-got, node-ky, node-request and node-superagent among the Node targets. Library-specific generated output does not install the dependency for you.
Inspect the generated request before running it
Method and URL
Check that the HTTP method is correct and that the full URL—including its query string—survived conversion. Query parameters can contain encoded characters; avoid decoding and re-encoding them casually, since that can change the server’s interpretation.
Headers and authentication
Review every generated header. A browser command may include cookies, authorization tokens, origin or referer values, and headers that were specific to that browser session. Keep only what the endpoint requires. Put credentials in environment variables or a secret manager rather than hard-coding them into committed source code. A header copied from DevTools can also expire or be bound to a session.
Request body
Check the body format and its content type together. The converter says it can turn JSON data into native objects, but generated code still needs to match the receiving endpoint’s expectations. Treat multipart form submissions, file paths and binary content as special cases: a command that refers to a local file cannot be assumed to work unchanged in a browser or on another machine.
Rank #2
Response handling
Generated code may show how to issue a request without fully expressing how your application should handle its response. Decide how to parse JSON, text or binary data, and how to handle non-success HTTP status codes. In Fetch-based code, a completed HTTP response is not itself proof that the server returned a successful status; check the status before treating the result as success.
Browser Fetch, Node.js and cURL are not interchangeable
Conversion translates request options into another runtime’s API; it does not make those runtimes identical. curlconverter describes its output as a starting point and warns that runtime defaults can differ from cURL, including redirects and gzip decompression. Its parser supports much of cURL’s argument set, but only HTTP is supported and the Bash parser is incomplete.
- Redirects: Check whether the selected client follows redirects and how it exposes the final response. If the original command relied on cURL redirect options, verify the converted behavior rather than assuming it.
- Compression: cURL and a JavaScript client may differ in how they request or decompress gzip content. Confirm that the response body you parse is in the expected form.
- Cross-origin browser requests: A request that succeeds in cURL or Node can still be blocked by browser cross-origin policy. This is enforced by the browser and cannot be fixed just by changing the converter output.
- Cookies and authorization: A copied command may replay credentials from a browser session. Use them only when authorized, and avoid carrying them into shared or long-lived code.
- Timeouts and streaming: Check how the chosen library configures timeouts and handles streamed responses. A generated request may not reproduce cURL’s behavior or your production requirements without additional code.
- TLS settings: Do not carry insecure certificate workarounds into application code without understanding the security impact. Check how the selected runtime handles certificate validation.
- Shell syntax: cURL commands are often written for a shell. Variables, quoting, escapes, command substitutions and nested commands can make parsing ambiguous or unsupported.
Convert commands from a terminal with the CLI or library
If you need repeatable conversion, curlconverter provides both a command-line interface and a JavaScript library. Its npm documentation states that Node.js 12 or later is required.
Install the CLI globally
Install the command-line tool with:
npm install --global curlconverterThe CLI accepts a cURL command or input from standard input and supports a language flag. For example, use a shell command that supplies your actual request and select the JavaScript target according to the CLI’s documented syntax. Because shell quoting rules vary, verify the command that you feed it rather than assuming a copied multiline request will parse the same way in every shell.
Install the library locally
For programmatic conversion inside a project, install the package locally:
npm install curlconverterThe library exposes conversion functions for command strings and already-parsed argument arrays. This can be useful when conversion is part of a controlled developer tool or workflow; it does not remove the need to validate generated code or protect secrets contained in input commands.
For exact CLI flags and the library’s current API signatures, refer to the project’s npm documentation and repository rather than guessing a version-specific invocation.
Troubleshooting common conversion problems
The converter output is incomplete or invalid
Likely cause: The command uses shell features the parser cannot understand, a non-HTTP cURL protocol, a nontrivial shell variable, or nested command substitution. Bash support is incomplete and only HTTP is supported.
Fix: Expand simple variables to their literal values for conversion, simplify the command, and convert only the HTTP request portion. Then inspect the output and restore configuration safely—for example, by reading secrets from environment variables in the finished program.
The JavaScript request gets a different response
Likely cause: Redirect, compression, headers, cookies or another runtime default differs from cURL.
Rank #4
Fix: Compare the generated method, URL and headers with the original command. Test redirect and compression behavior explicitly, then configure the chosen client where necessary. Avoid pasting live credentials into public debugging tools or logs.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The request works in Node but fails in the browser
Likely cause: The browser applies cross-origin restrictions or does not have the same cookie and authorization context as the command-line request.
Fix: Check the browser console and the server’s cross-origin configuration. If this is a web application, make the request through an authorized server-side endpoint when appropriate rather than attempting to bypass browser security.
A file upload or multipart body does not convert cleanly
Likely cause: The cURL command references a local file or encodes multipart data in a way that does not map directly to the target runtime.
Fix: Rebuild the upload using the target environment’s file and multipart APIs, and verify both the form field names and content type. Browser code cannot read arbitrary local paths as a server-side process can.
Free tools Windows power users keep installed
One-click scans. No signup required.
The converted command includes credentials
Likely cause: DevTools copied session cookies, bearer tokens or other authentication headers.
Fix: Remove values that are not necessary, substitute environment variables for required secrets, and rotate exposed credentials if they may have been shared. Do not commit a raw copied command to a repository.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Or skip the browser setup
If the real goal is to capture a webpage as an image or PDF rather than reproduce an arbitrary API request, ScreenshotNeo provides a screenshot API and MCP server. One GET request can return a PNG, JPEG, WebP or PDF. Its capture flow can accept cookie and consent banners and remove more than 60 known consent platforms, newsletter popups and chat widgets before the shot; these steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, with verdict and billing information in response headers. AI agents can use its MCP tools, including take_screenshot, get_page_info and capture_pdf.
For the API key and parameter details, see the ScreenshotNeo documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up free for ScreenshotNeo.
Frequently asked questions
Can I convert cURL to Axios or another Node client?
Yes. Choose a supported target such as node-axios, node-got, node-ky or node-superagent in the converter, then install and configure the matching dependency in your project.
Is curlconverter safe for private commands?
The browser converter says conversion happens entirely in the browser and that commands are not transmitted or recorded. Still, protect copied cookies and credentials: the command itself may contain reusable access to an account.
Does generated JavaScript reproduce every cURL option?
No. The project implements much of cURL’s argument parsing, but documents unsupported areas including non-HTTP protocols and incomplete Bash parsing. Even valid output can behave differently because the target runtime has its own defaults.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
