HTTP & CLI Request Engine
cURL POST Request Generator
Build production-ready cURL POST commands with formatted JSON payloads, form URL-encoded bodies, multipart uploads, and custom headers. Export directly to Python, fetch, and Axios.
Mastering cURL POST Requests
The HTTP POST method submits an entity to the specified resource, often causing a change in state or side effects on the server. When communicating with REST APIs, gRPC-JSON transcoders, or microservices, constructing properly formatted POST commands ensures that server deserializers successfully parse request bodies.
1. Escaping JSON in Shell Environments
When passing inline JSON with -d, enclosing the entire JSON payload in single quotes ('{"key": "val"}') protects inner double quotes from bash or zsh shell expansion.
Frequently Asked Questions
Pass the
-X POST flag, set the header -H "Content-Type: application/json", and supply the data payload via -d '{"key":"value"}'.
The
-d flag sends URL-encoded form data (application/x-www-form-urlencoded) or raw text/JSON payloads. The -F flag creates multipart form data (multipart/form-data), which is required when uploading binary files using -F "file=@/path/to/image.png".
Prefix the filename with the
@ character in the -d flag: curl -X POST https://api.example.com/items -H "Content-Type: application/json" -d @payload.json.
Yes. Providing the
-d (--data) flag automatically causes cURL to send an HTTP POST request even if -X POST is omitted.