curlconverter

Transpile curl commands into Python and other languages.

Try it in the browser at curlconverter.com or from the command line:

$ curlconverter --data-raw "hello=world" example.com
import requests

data = {
    'hello': 'world',
}

response = requests.post('http://example.com', data=data)

Features:

Understands most Bash syntax
- ANSI-C quoted strings (which "Copy as cURL" can output)
- Piped file or input (such as heredocs)
- Ignores comments
- Reports syntax errors
Knows about all of curl's 300 or so arguments, including deleted ones, but most are ignored
Supports multiple short arguments passed as one, for example -OvXPOST instead of -O -v -X POST
--data @filename generates Python code that reads from that file
--data @- generates Python code that reads from stdin (or piped file/input)
Converts JSON to native objects
Warns about issues with the conversion

Limitations:

Only HTTP is supported
If multiple URLs are passed only the last one is used
By default, curl doesn't follow redirects but the generated code will do whatever the default is for that runtime, to keep it simpler. For example Python's Requests follows redirects by default, so unless you explicitly set the redirect policy with -L/--location/--no-location, the resulting code will not do what curl would do if the server responds with a redirect
Code generators for other languages are less thorough than the Python generator
and much more

Install

Install the JavaScript library for use in your own projects with

npm install curlconverter

Install the command line tool with

npm install --global curlconverter

curlconverter requires Node 14+.

Usage

Usage as a library

The JavaScript API is a bunch of functions that can take either a string of Bash code or an array of already-parsed arguments (like process.argv) and return a string with the resulting program:

import * as curlconverter from 'curlconverter';

curlconverter.toPython('curl example.com');
curlconverter.toPython(['curl', 'example.com']);
// "import requests\n\nresponse = requests.get('http://example.com')\n"

Note: add "type": "module" to your package.json for the import statement above to work.

There's a corresponding set of functions that also return an array of warnings if there are any issues with the conversion:

curlconverter.toPythonWarn('curl ftp://example.com');
curlconverter.toPythonWarn(['curl', 'ftp://example.com']);
// [
//   "import requests\n\nresponse = requests.get('ftp://example.com')\n",
//   [ [ 'bad-scheme', 'Protocol "ftp" not supported' ] ]
// ]

If you want to host curlconverter yourself and use it in the browser, it needs two WASM files to work, tree-sitter.wasm and tree-sitter-bash.wasm, which it will request from the root directory of your web server. If you are hosting a static website and using Webpack, you need to copy these files from the node_modules/ directory to your server's root directory in order to serve them. You can look at the webpack.config.js for curlconverter.com to see how this is done. You will also need to set {module: {experiments: {topLevelAwait: true}}} in your webpack.config.js.

Usage from the command line

The command line tool is a drop-in replacement for curl. Take any curl command, change "curl" to "curlconverter" and it will print code instead of making the request. Alternatively, you can pass - to tell it to read the curl command from stdin.

$ curlconverter example.com
$ echo 'curl example.com' | curlconverter -

You can choose the output language by passing --language <language>. The options are

ansible
cfml
csharp
dart
elixir
go
java
javascript, node, node-axios, node-request
json
matlab
php, php-request
python (the default)
r
ruby
rust

Usage in VS Code

There's a VS Code extension that adds a "Paste cURL as <language>" option to the right-click menu: https://marketplace.visualstudio.com/items?itemName=curlconverter.curlconverter. It has to use an old version of curlconverter, so it doesn't support the same languages, curl arguments or Bash syntax as the current version.

Contributing

See CONTRIBUTING.md

Laifang / curlconverter