Automation & APIs · Free Tool
Webhook & cURL Request Builder
Build a webhook or API request visually and get a ready-to-run cURL command and JavaScript fetch() snippet, live as you type.
About this tool
This tool turns a form into working code: pick an HTTP method, enter a URL, add headers, and (for POST/PUT/PATCH) a request body, and it instantly generates a properly shell-escaped cURL command alongside an equivalent JavaScript fetch() snippet. Toggle "JSON body" to auto-add a Content-Type: application/json header and validate your payload as you type — a syntax error shows up immediately instead of failing silently at request time.
It exists for the moment you are debugging a webhook receiver, replaying a request from a provider's docs, or handing a teammate a copy-paste-ready command instead of a screenshot of a form. Every character you type is reflected in both outputs live, so you can sanity-check headers and body escaping before the request ever leaves your machine — nothing is sent anywhere, it only builds text.
Common uses
- Turn a Postman-style request into a cURL command to paste into a teammate's terminal or a bug report
- Prototype the exact headers and JSON payload a webhook provider (Stripe, GitHub, Slack) expects before wiring up real code
- Generate a fetch() snippet to drop straight into a Node.js script or browser console for a quick integration test
Frequently asked questions
Does this tool actually send the request?
No. It only builds the cURL command and fetch() snippet as text — nothing is sent over the network. You copy the output and run it yourself in a terminal, script, or browser console.
How does it handle quotes and special characters in headers or the body?
The cURL output wraps every value in single quotes and escapes any embedded single quote using the standard shell trick ('\''), so the command is safe to paste as-is. The fetch() snippet uses JSON-safe string literals for the same reason.
What does the "JSON body" checkbox do?
When checked, it adds a Content-Type: application/json header automatically (skipping it if you already added one) and validates your body text as JSON, flagging syntax errors before you copy the command. Uncheck it to send any raw text body, such as form-encoded data or XML.
Is my data uploaded to a server?
No. This tool runs entirely in your browser using JavaScript — nothing you type is transmitted, logged, or stored anywhere. You can even use it offline once the page has loaded.