Is my data sent to a server?

No. All processing happens entirely in your browser. Your data never leaves your device.

Can I use this offline?

Once the page is loaded, the tool works offline because all logic runs client-side.

cURL Command Builder

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100% Client-Side - Zero Server Uploads. Build and format cURL commands with syntax highlighting. Convert between cURL commands and code snippets (Python, JavaScript, Go, etc.). 100% client-side.

Updated 2026-11-11

Your data stays in your browser. Requests are built locally and are not uploaded to DevPouch.

Request Builder

HTTP Method

URL * Full URL including protocol. Query parameters sync with table below.

Query Parameters

Key	Value

Headers

Header Name	Value

Authentication

Bearer Token Will be sent as Authorization: Bearer ***

Username

Password

Will be sent as -u "username:password" (Base64 encoded in code snippets)

Request Body

Body Type

JSON Body Content-Type: application/json header added automatically. For Form Data, edit the table below (stays in sync with this JSON).

Key	Value

Each row becomes a -F "key=value" flag. Edits sync with JSON tab above.

URL Encoded Body Content-Type: application/x-www-form-urlencoded header added automatically.

Raw Text Body Sent as-is with no automatic Content-Type header.

Common Flags

-L Follow redirects

-k Insecure (ignore SSL)

-s Silent

-v Verbose

Generated Output

cURL Command

JavaScript (fetch)

Python (requests)

Go (net/http)

Understanding cURL Syntax & Flags

Core cURL Flags

Flag	Description	Example
`-X, --request`	Specify HTTP method (GET, POST, PUT, DELETE, etc.)	`curl -X POST ...`
`-H, --header`	Add request header (can be used multiple times)	`curl -H "Content-Type: application/json" ...`
`-d, --data`	Send data in request body (POST/PUT/PATCH)	`curl -d '{"key":"value"}' ...`
`-F, --form`	Send multipart/form-data (file uploads, forms)	`curl -F "file=@image.png" ...`
`-u, --user`	Basic authentication username:password	`curl -u "user:pass" ...`
`-L, --location`	Follow redirects (3xx responses)	`curl -L https://example.com`
`-k, --insecure`	Ignore SSL certificate validation (dev only!)	`curl -k https://self-signed.badssl.com`
`-s, --silent`	Silent mode (suppress progress meter)	`curl -s https://api.example.com`
`-v, --verbose`	Verbose output (show request/response headers)	`curl -v https://example.com`
`-o, --output`	Write output to file instead of stdout	`curl -o file.json https://api.example.com`
`-i, --include`	Include response headers in output	`curl -i https://example.com`
`-I, --head`	Fetch headers only (HEAD request)	`curl -I https://example.com`
`-A, --user-agent`	Set custom User-Agent string	`curl -A "MyApp/1.0" ...`
`--max-time`	Maximum time in seconds for the whole operation	`curl --max-time 30 ...`
`--connect-timeout`	Maximum time in seconds for connection phase	`curl --connect-timeout 10 ...`

Multiline vs Single-line Format

This builder offers two output formats:

Multiline (default): Uses backslash (\) line continuations for readability. Each flag on its own line. Compatible with Bash, Zsh, and most Unix shells.
Single-line: Compact format for embedding in scripts, CI configs, or documentation.

Quotation Escaping: Windows vs Unix

cURL commands behave differently across shells:

Unix (Bash, Zsh, Fish): Use single quotes for literal strings. Escape single quotes inside with '\''. Example: curl -d '{"name":"O'Reilly"}'
Windows Command Prompt (cmd.exe): Use double quotes. Escape double quotes with backslash. Example: curl -d "{\"name\":\"O'Reilly\"}"
PowerShell: Use single quotes for literals, double for expansion. Escape with backtick. Example: curl -d '{\"name\":\"O`Reilly\"}'
Git Bash / WSL on Windows: Behaves like Unix Bash.

This builder generates Unix-style (single-quoted) commands by default. For Windows, either use Git Bash/WSL or manually adjust quoting.

Frequently Asked Questions

: A cURL command builder is a visual tool that helps you construct complex cURL commands by filling in forms for URL, method, headers, authentication, body, and flags. It generates the equivalent command line and code snippets in multiple languages.
: No. All command generation happens entirely in your browser. Your API endpoints, tokens, and request data never leave your device. The tool works offline once loaded.
: Currently, the builder only generates commands from the form inputs. Parsing arbitrary cURL commands is complex due to shell quoting variations. For now, use the form to rebuild your request.
: This tool generates snippets for: cURL (raw command), JavaScript (fetch API), Python (requests library), and Go (net/http standard library). More languages may be added in future updates.
: When you select "Form Data" as body type, the builder shows a key/value table. Edits in this table automatically update the hidden JSON representation (an array of {"key": "...", "value": "..."} objects), which stays in sync with the JSON textarea. This ensures the generated cURL -F flags and the Python data={...} dict are always consistent.
: Single quotes provide the most reliable escaping in Unix shells (Bash, Zsh). They prevent variable expansion, command substitution, and most special character interpretation. The builder escapes embedded single quotes using the standard '\'' pattern.
: The snippets are starting points. Review and adapt them for your environment: add error handling, timeouts, retry logic, and proper secret management (never hardcode tokens). The Python snippet uses requests (install via pip install requests). Go uses only standard library.
: Not directly. The Form Data table generates -F "key=value" for text fields. For file uploads, manually edit the generated command to use -F "file=@/path/to/file" syntax. Browser-based tools cannot access local filesystem paths for security reasons.
: Not yet. The tool state resets on page reload. You can use "Download .sh" to save the generated command, or copy it to your notes. LocalStorage persistence is planned for a future update.

How to Build a cURL Command

Enter the URL. Type the target URL in the URL field (e.g., https://api.example.com/users).
Select HTTP method. Choose GET, POST, PUT, PATCH, DELETE, etc. from the dropdown.
Add headers. Click Add Header to add custom headers like Authorization, Content-Type, etc.
Add body (for POST/PUT/PATCH). Enter JSON, form data, or raw text in the body editor.
Configure options. Set timeout, follow redirects, SSL verification, and output format.
Generate command. Click Generate to produce the cURL command.
Copy or download. Use Copy to copy to clipboard or Download .sh to save as a shell script.

All command building happens locally in your browser. Your request data never leaves your device.

cURL Options Reference

Option	Flag	Description
URL	`-X` / implicit	Target endpoint
Method	`-X METHOD`	HTTP verb (GET, POST, PUT, etc.)
Header	`-H "Key: Value"`	Request header
JSON Body	`-d '{}' -H "Content-Type: application/json"`	JSON payload
Form Data	`-F "key=value"`	Multipart/form-data
Auth Bearer	`-H "Authorization: Bearer "`	Bearer token auth
Timeout	`--max-time`	Request timeout
Follow Redirects	`-L`	Follow 3xx redirects
Insecure SSL	`-k`	Skip certificate verification
Output File	`-o file` / `-O`	Save response to file
Verbose	`-v`	Debug output
Silent	`-s`	Suppress progress meter