cURL Command Builder & Request Generator

How to Build & Generate cURL Commands

cURL (Client URL) is a command-line tool used by developers to transfer data to or from a server using various protocols, including HTTP, HTTPS, FTP, and SFTP.

1. HTTP Methods & Request Structure

• GET: Used to retrieve data from a specified endpoint without modifying server state.
• POST: Submits data payload (such as JSON, form data, or raw text) to create new resources.
• PUT / PATCH: Updates existing resources either completely (PUT) or partially (PATCH).
• DELETE: Removes specified resources from the server database.

2. Adding Headers and Authorization

• Custom Headers (-H): Pass content specifications (Content-Type: application/json), client identification, or session tokens.
• Bearer Tokens: Send OAuth 2.0 or JWT credentials via Authorization: Bearer <token>.
• Basic Authentication (-u): Pass username:password credentials which cURL encodes to Base64 format automatically.

3. Common cURL Command Flags

• -X, --request <METHOD>: Specifies custom HTTP method to send.
• -H, --header <HEADER>: Adds custom header strings to the request.
• -d, --data <DATA>: Sends specified HTTP POST payload.
• -F, --form <KEY=VALUE>: Constructs multipart/form-data uploads.
• -L, --location: Forces cURL to follow HTTP 3xx redirect headers automatically.
• -i, --include: Includes HTTP response headers in terminal stdout.
• -k, --insecure: Allows insecure SSL connections (useful for local development).
• -s, --silent: Disables progress meters and error messages.
• --compressed: Requests gzip or deflate response compression.

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Key Features

• Visual Request Builder: Configure HTTP method, target URL, query parameters, custom headers, and request body (JSON, Form Data, URL-Encoded, Raw) in an interactive UI.
• Bi-Directional cURL Parser: Paste raw curl commands from browser DevTools or documentation to automatically parse and populate all form fields.
• Multi-Language Code Exporter: Convert cURL requests into ready-to-use code snippets for JavaScript (fetch, axios), Python (requests, http.client), Go, Node.js, PHP, Java, Rust, Ruby, and C#.
• Live Endpoint Execution: Test live API requests directly from the browser with CORS fallback options and response header inspection.

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Common Use Cases

• API Endpoint Testing: Rapidly constructing and testing HTTP GET, POST, PUT, and DELETE requests against REST endpoints.
• Importing Browser DevTools Network Requests: Copying "Copy as cURL" from Chrome/Firefox DevTools network tab and pasting it to edit headers or payload.
• Code Generation for Client Applications: Translating raw cURL commands from API documentation into clean Python, JavaScript, or Go code snippets.
• Debugging Authentication Headers: Adding Bearer tokens, Basic Auth, or custom API keys to requests cleanly without syntax escaping issues.

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Frequently Asked Questions

Why use a cURL Builder?

A cURL Builder provides a visual interface for constructing API requests without syntax errors, missing quotes, or misplaced line-breaks. It also translates cURL commands instantly into code snippets for JavaScript, Python, Go, Node.js, PHP, Java, Rust, Ruby, and C#.

Is my API data private when using this tool?

Yes. DevToolkit runs 100% locally in your browser memory. Your URLs, secret tokens, request payloads, and generated code snippets are never transmitted to any external server.