swagger-editor
Advanced tools
SwaggerEditor is using [**forked** Create React App](https://github.com/swagger-api/swagger-editor-cra/) as it's building infrastructure.
SwaggerEditor is using forked Create React App as it's building infrastructure.
Swagger Editor uses Scarf to collect anonymized installation analytics. These analytics help support the maintainers of this library and ONLY run during installation. To opt out, you can set the scarfSettings.enabled field to false in your project's package.json:
// package.json
{
// ...
"scarfSettings": {
"enabled": false
}
// ...
}
Alternatively, you can set the environment variable SCARF_ANALYTICS to false as part of the environment that installs your npm packages, e.g., SCARF_ANALYTICS=false npm install.
These prerequisites are required both for installing SwaggerEditor as a npm package and local development setup.
>=2.29Assuming prerequisites are already installed, SwaggerEditor npm package is installable and works with Node.js >= 12.22.0.
You can install SwaggerEditor via npm CLI by running the following command:
$ npm install swagger-editor@alpha
NOTE: when using bundler to build your project which is using swagger-editor@5 npm package, you might run into following Node.js error:
Reached heap limit Allocation failed - JavaScript heap out of memory. It's caused by significant amount of code that needs to be bundled. This error can be resolved by extending the Node.js max heap limit:export NODE_OPTIONS="--max_old_space_size=4096".
Use the package in you application:
index.js:
import React from 'react';
import ReactDOM from 'react-dom';
import SwaggerEditor from 'swagger-editor';
import 'swagger-editor/swagger-editor.css';
const url = "https://raw.githubusercontent.com/asyncapi/spec/v2.2.0/examples/streetlights-kafka.yml";
const MyApp = () => (
<div>
<h1>SwaggerEditor Integration</h1>
<SwaggerEditor url={url} />
</div>
);
self.MonacoEnvironment = {
/**
* We're building into the dist/ folder. When application starts on
* URL=https://example.com then SwaggerEditor will look for
* `apidom.worker.js` on https://example.com/dist/apidom.worker.js and
* `editor.worker` on https://example.com/dist/editor.worker.js.
*/
baseUrl: `${document.baseURI || location.href}dist/`,
}
ReactDOM.render(<MyApp />, document.getElementById('swagger-editor'));
webpack.config.js (webpack@5)
Install dependencies needed for webpack@5 to properly build SwaggerEditor.
$ npm i stream-browserify --save-dev
$ npm i https-browserify --save-dev
$ npm i stream-http --save-dev
$ npm i util --save-dev
const path = require('path');
const webpack = require('webpack');
module.exports = {
mode: 'production',
entry: {
app: './index.js',
'apidom.worker': 'swagger-editor/apidom.worker',
'editor.worker': 'swagger-editor/editor.worker',
},
output: {
globalObject: 'self',
filename: '[name].js',
path: path.resolve(__dirname, 'dist')
},
resolve: {
fallback: {
path: false,
fs: false,
http: require.resolve('stream-http'), // required for asyncapi parser
https: require.resolve('https-browserify'), // required for asyncapi parser
stream: require.resolve('stream-browserify'),
util: require.resolve('util'),
url: require.resolve('url'),
zlib: false,
},
alias: {
// This alias make sure we don't pull two different versions of monaco-editor
'monaco-editor': '/node_modules/monaco-editor',
// This alias makes sure we're avoiding a runtime error related to this package
'@stoplight/ordered-object-literal$': '/node_modules/@stoplight/ordered-object-literal/src/index.mjs',
},
},
plugins: [
new webpack.ProvidePlugin({
Buffer: ['buffer', 'Buffer'],
}),
],
module: {
rules: [
{
test: /\.css$/,
use: ['style-loader', 'css-loader']
},
/**
* The default way in which webpack loads wasm files won’t work in a worker,
* so we will have to disable webpack’s default handling of wasm files and
* then fetch the wasm file by using the file path that we get using file-loader.
*
* Resource: https://pspdfkit.com/blog/2020/webassembly-in-a-web-worker/
*
* Alternatively, WASM file can be bundled directly into JavaScript bundle as data URLs.
* This configuration reduces the complexity of WASM file loading
* but increases the overal bundle size:
*
* {
* test: /\.wasm$/,
* type: 'asset/inline',
* }
*/
{
test: /\.wasm$/,
loader: 'file-loader',
type: 'javascript/auto', // this disables webpacks default handling of wasm
},
]
}
};
Alternative webpack.config.js (webpack@5)
We've already built Web Workers fragments for you, and they're located inside our npm distribution
package in dist/umd/ directory. In order to avoid complexity of building the Web Worker fragments you can
use those fragments directly. This setup will work both for production and development (webpack-dev-server)
and will significantly shorten your build process.
Install copy-webpack-plugin and other needed dependencies.
$ npm i copy-webpack-plugin --save-dev
$ npm i stream-browserify --save-dev
$ npm i https-browserify --save-dev
$ npm i stream-http --save-dev
$ npm i util --save-dev
const path = require('path');
const webpack = require('webpack');
const CopyWebpackPlugin = require('copy-webpack-plugin');
module.exports = {
mode: 'production',
entry: {
app: './index.js',
},
output: {
globalObject: 'self',
filename: 'static/js/[name].js',
path: path.resolve(__dirname, 'dist')
},
resolve: {
fallback: {
path: false,
fs: false,
http: require.resolve('stream-http'), // required for asyncapi parser
https: require.resolve('https-browserify'), // required for asyncapi parser
stream: require.resolve('stream-browserify'),
util: require.resolve('util'),
url: require.resolve('url'),
zlib: false,
},
alias: {
// This alias make sure we don't pull two different versions of monaco-editor
'monaco-editor': '/node_modules/monaco-editor',
// This alias makes sure we're avoiding a runtime error related to this package
'@stoplight/ordered-object-literal$': '/node_modules/@stoplight/ordered-object-literal/src/index.mjs',
}
},
plugins: [
new webpack.ProvidePlugin({
Buffer: ['buffer', 'Buffer'],
}),
new CopyWebpackPlugin({
patterns: [
{
from: 'node_modules/swagger-editor/dist/umd/apidom.worker.js',
to: 'static/js',
},
{
from: 'node_modules/swagger-editor/dist/umd/editor.worker.js',
to: 'static/js',
}
]
}),
],
module: {
rules: [
{
test: /\.css$/,
use: ['style-loader', 'css-loader']
},
]
}
};
Assuming prerequisites are already installed, Node.js >=20.3.0 and npm >=9.6.7
are the minimum required versions that this repo runs on, but we recommend using the latest version of Node.js@20.
If you use nvm, running following command inside this repository will automatically pick the right Node.js version for you:
$ nvm use
Run the following commands to set up the repository for local development:
$ git clone https://github.com/swagger-api/swagger-editor.git
$ cd swagger-editor
$ git checkout next
$ git submodule init
$ git submodule update
$ npm i
$ npm start
Lint
$ npm run lint
Runs unit and integration tests
$ npm test
Runs E2E Cypress tests
Usage in development environment:
$ npm run cy:dev
Usage in Continuos Integration (CI) environment:
$ npm run cy:ci
Build
$ npm run build
This script will build all the SwaggerEditor build artifacts - app, esm and umd.
After building artifacts, every two new directories will be created: build/ and dist/.
build/
$ npm run build:app
$ npm run build:app:serve
Builds and serves standalone SwaggerEditor application and all it's assets on http://localhost:3050/.
dist/esm/
$ npm run build:bundle:esm
This bundle is suited for consumption by 3rd parties, which want to use SwaggerEditor as a library in their own applications and have their own build process.
dist/umd/
$ npm run build:bundle:umd
SwaggerEditor UMD bundle exports SwaggerEditor symbol on global object. It's bundled with React defined as external. This allows consumer to use his own version of React + ReactDOM and mount SwaggerEditor lazily.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta
name="description"
content="SwaggerEditor"
/>
<title>SwaggerEditor</title>
<link rel="stylesheet" href="./swagger-editor.css" />
</head>
<body>
<div id="swagger-editor"></div>
<script src="https://unpkg.com/react@18/umd/react.production.min.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js" crossorigin></script>
<script src="./dist/umd/swagger-editor.js"></script>
<script>
const props = {
url: 'https://raw.githubusercontent.com/asyncapi/spec/v2.2.0/examples/streetlights-kafka.yml',
};
const element = React.createElement(SwaggerEditor, props);
const domContainer = document.querySelector('#swagger-editor');
ReactDOM.render(element, domContainer);
</script>
</body>
</html>
npm
SwaggerEditor is released as swagger-editor@5 npm package on npmjs.com.
Package can also be produced manually by running following commands (assuming you're already followed setting up steps):
$ npm run build:bundle:esm
$ npm run build:bundle:umd
$ npm pack
SwaggerEditor maps its build artifacts in package.json file in following way:
"unpkg": "./dist/umd/swagger-editor.js",
"module": "./dist/esm/swagger-editor.js",
"browser": "./dist/esm/swagger-editor.js",
"jsnext:main": "./dist/esm/swagger-editor.js",
"exports": {
"./package.json": "./package.json",
"./swagger-editor.css": "./dist/swagger-editor.css",
".": {
"browser": "./dist/esm/swagger-editor.js"
},
"./plugins/*": {
"browser": "./dist/esm/plugins/*/index.js"
},
"./presets/*": {
"browser": "./dist/esm/presets/*/index.js"
},
"./apidom.worker": {
"browser": "./dist/esm/apidom.worker.js"
},
"./editor.worker": {
"browser": "./dist/esm/editor.worker.js"
}
}
To learn more about these fields please refer to webpack mainFields documentation or to Node.js Modules: Packages documentation.
[!IMPORTANT] By older versions we specifically refer to
React >=17 <18.
By default swagger-editor@5 npm package comes with latest version of React@18. It's possible to use swagger-editor@5 npm package with older version of React.
Let's say my application integrates with swagger-editor@5 npm package and uses React@17.0.2.
In order to inform swagger-editor@5 npm package that I require it to use my React version, I need to use npm overrides.
{
"dependencies": {
"react": "=17.0.2",
"react-dom": "=17.0.2"
},
"overrides": {
"swagger-editor": {
"react": "$react",
"react": "$react-dom",
"react-redux": "^8"
}
}
}
[!NOTE] The React and ReactDOM override are defined as a reference to the dependency. Since react-redux@9 only supports
React >= 18, we need to use react-redux@8.
In order to inform swagger-editor@5 npm package that I require it to use my specific React version, I need to use yarn resolutions.
{
"dependencies": {
"react": "17.0.2",
"react-dom": "17.0.2"
},
"resolutions": {
"swagger-editor/react": "17.0.2",
"swagger-editor/react-dom": "17.0.2",
"swagger-editor/react-redux": "^8"
}
}
[!NOTE] The React and ReactDOM resolution cannot be defined as a reference to the dependency. Unfortunately yarn does not support aliasing like
$reactor$react-domas npm does. You'll need to specify the exact versions.
It is possible to use an environment variable to specify a local JSON/YAML file or a remote URL for SwaggerEditor to load on startup. These environment variables will get baked in during build time into build artifacts.
Environment variables currently available:
| Variable name | Description |
|---|---|
REACT_APP_DEFINITION_FILE | Specifies a local file path, and the specified file must also be present in the /public/static directory |
REACT_APP_DEFINITION_URL | Specifies a remote URL. This environment variable currently takes precedence over REACT_APP_SWAGGER_FILE |
REACT_APP_VERSION | Specifies the version of this app. The version is read from package.json file. |
Sample environment variable values can be found in .env file. For more information about using
environment variables, please refer to adding Custom Environment Variables
section of Create React App documentation.
SwaggerEditor comes with number of preview plugins that are responsible for rendering
the definition that's being created in the editor. These plugins include:
With a bit of adapting, we can use these plugins with SwaggerUI to provide ability to render AsyncAPI or API Design Systems definitions with SwaggerUI.
import SwaggerUI from 'swagger-ui';
import SwaggerUIStandalonePreset from 'swagger-ui/dist/swagger-ui-standalone-preset';
import 'swagger-editor/swagger-editor.css';
import EditorContentTypePlugin from 'swagger-editor/plugins/editor-content-type';
import EditorPreviewAsyncAPIPlugin from 'swagger-editor/plugins/editor-preview-asyncapi';
import EditorPreviewAPIDesignSystemsPlugin from 'swagger-editor/plugins/editor-preview-api-design-systems';
import SwaggerUIAdapterPlugin from 'swagger-editor/plugins/swagger-ui-adapter';
SwaggerUI({
url: 'https://petstore.swagger.io/v2/swagger.json',
dom_id: '#swagger-ui',
presets: [SwaggerUI.presets.apis, SwaggerUIStandalonePreset],
plugins: [
EditorContentTypePlugin,
EditorPreviewAsyncAPIPlugin,
EditorPreviewAPIDesignSystemsPlugin,
SwaggerUIAdapterPlugin,
SwaggerUI.plugins.DownloadUrl,
],
});
The key here is SwaggerUIAdapter plugin which adapts SwaggerEditor plugins to use
directly with SwaggerUI.
SwaggerUI standalone mode is supported as well. With standalone mode you'll get a TopBar with
an input where URL of the definition can be provided and this definition is subsequently loaded
by the SwaggerUI.
import SwaggerUI from 'swagger-ui';
import SwaggerUIStandalonePreset from 'swagger-ui/dist/swagger-ui-standalone-preset';
import 'swagger-ui/dist/swagger-ui.css';
import 'swagger-editor/swagger-editor.css';
import EditorContentTypePlugin from 'swagger-editor/plugins/editor-content-type';
import EditorPreviewAsyncAPIPlugin from 'swagger-editor/plugins/editor-preview-asyncapi';
import EditorPreviewAPIDesignSystemsPlugin from 'swagger-editor/plugins/editor-preview-api-design-systems';
import SwaggerUIAdapterPlugin from 'swagger-editor/plugins/swagger-ui-adapter';
SwaggerUI({
url: 'https://petstore.swagger.io/v2/swagger.json',
dom_id: '#swagger-ui',
presets: [SwaggerUI.presets.apis, SwaggerUIStandalonePreset],
plugins: [
EditorContentTypePlugin,
EditorPreviewAsyncAPIPlugin,
EditorPreviewAPIDesignSystemsPlugin,
SwaggerUIAdapterPlugin,
SwaggerUI.plugins.DownloadUrl,
],
layout: 'StandaloneLayout',
});
It's possible to utilize preview plugins in a build-free way via unpkg.com to create a standalone multi-spec supporting version of SwaggerUI.
<!DOCTYPE html>
<html >
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="theme-color" content="#000000" />
<meta name="description" content="SwaggerUIMultifold" />
<link rel="stylesheet" href="//unpkg.com/swagger-editor@5.0.0-alpha.86/dist/swagger-editor.css" />
</head>
<body style="margin:0; padding:0;">
<section id="swagger-ui"></section>
<script src="//unpkg.com/swagger-ui-dist@5.11.0/swagger-ui-bundle.js"></script>
<script src="//unpkg.com/swagger-ui-dist@5.11.0/swagger-ui-standalone-preset.js"></script>
<script>
ui = SwaggerUIBundle({});
// expose SwaggerUI React globally for SwaggerEditor to use
window.React = ui.React;
</script>
<script src="//unpkg.com/swagger-editor@5.0.0-alpha.86/dist/umd/swagger-editor.js"></script>
<script>
SwaggerUIBundle({
url: 'https://petstore3.swagger.io/api/v3/openapi.json',
dom_id: '#swagger-ui',
presets: [
SwaggerUIBundle.presets.apis,
SwaggerUIStandalonePreset,
],
plugins: [
SwaggerEditor.plugins.EditorContentType,
SwaggerEditor.plugins.EditorPreviewAsyncAPI,
SwaggerEditor.plugins.EditorPreviewApiDesignSystems,
SwaggerEditor.plugins.SwaggerUIAdapter,
SwaggerUIBundle.plugins.DownloadUrl,
],
layout: 'StandaloneLayout',
});
</script>
</body>
</html>
SwaggerEditor is just a number of SwaggerUI plugins used with swagger-ui-react. Customized SwaggerEditor can be created by composing individual plugins with either swagger-ui and swagger-ui-react.
List of available plugins:
Individual plugins can be imported in the following way:
import EditorContentTypePlugin from 'swagger-editor/plugins/editor-content-type';
import EditorContentReadOnlyPlugin from 'swagger-editor/plugins/editor-content-read-only';
Along with plugins, presets are available as well. Preset is a collection of plugins that are design to work together to provide a compound feature.
List of available presets:
Individual presets can be imported in the following way:
import TextareaPreset from 'swagger-editor/presets/textarea';
import MonacoPreset from 'swagger-editor/presets/monaco';
NOTE: Please refer to the Plug points documentation of SwaggerUI to understand how presets are passed to SwaggerUI.
import SwaggerUI from 'swagger-ui';
import 'swagger-ui/dist/swagger-ui.css';
import ModalsPlugin from 'swagger-editor/plugins/modals';
import DialogsPlugin from 'swagger-editor/plugins/dialogs';
import DropdownMenuPlugin from 'swagger-editor/plugins/dropdown-menu';
import DropzonePlugin from 'swagger-editor/plugins/dropzone';
import VersionsPlugin from 'swagger-editor/plugins/versions';
import EditorTextareaPlugin from 'swagger-editor/plugins/editor-textarea';
import EditorMonacoPlugin from 'swagger-editor/plugins/editor-monaco';
import EditorMonacoLanguageApiDOMPlugin from 'swagger-editor/plugins/editor-monaco-language-apidom';
import EditorContentReadOnlyPlugin from 'swagger-editor/plugins/editor-content-read-only';
import EditorContentOriginPlugin from 'swagger-editor/plugins/editor-content-origin';
import EditorContentTypePlugin from 'swagger-editor/plugins/editor-content-type';
import EditorContentPersistencePlugin from 'swagger-editor/plugins/editor-content-persistence';
import EditorContentFixturesPlugin from 'swagger-editor/plugins/editor-content-fixtures';
import EditorPreviewPlugin from 'swagger-editor/plugins/editor-preview';
import EditorPreviewSwaggerUIPlugin from 'swagger-editor/plugins/editor-preview-swagger-ui';
import EditorPreviewAsyncAPIPlugin from 'swagger-editor/plugins/editor-preview-asyncapi';
import EditorPreviewApiDesignSystemsPlugin from 'swagger-editor/plugins/editor-preview-api-design-systems';
import TopBarPlugin from 'swagger-editor/plugins/top-bar';
import SplashScreenPlugin from 'swagger-editor/plugins/splash-screen';
import LayoutPlugin from 'swagger-editor/plugins/layout';
import EditorSafeRenderPlugin from 'swagger-editor/plugins/editor-safe-render';
SwaggerUI({
url: 'https://petstore.swagger.io/v2/swagger.json',
dom_id: '#swagger-editor',
plugins: [
ModalsPlugin,
DialogsPlugin,
DropdownMenuPlugin,
DropzonePlugin,
VersionsPlugin,
EditorTextareaPlugin,
EditorMonacoPlugin,
EditorMonacoLanguageApiDOMPlugin,
EditorContentReadOnlyPlugin,
EditorContentOriginPlugin,
EditorContentTypePlugin,
EditorContentPersistencePlugin,
EditorContentFixturesPlugin,
EditorPreviewPlugin,
EditorPreviewSwaggerUIPlugin,
EditorPreviewAsyncAPIPlugin,
EditorPreviewApiDesignSystemsPlugin,
TopBarPlugin,
SplashScreenPlugin,
LayoutPlugin,
EditorSafeRenderPlugin,
],
layout: 'StandaloneLayout',
});
import React from 'react';
import ReactDOM from 'react-dom';
import SwaggerUI from 'swagger-ui-react';
import 'swagger-ui-react/swagger-ui.css';
import ModalsPlugin from 'swagger-editor/plugins/modals';
import DialogsPlugin from 'swagger-editor/plugins/dialogs';
import DropdownMenuPlugin from 'swagger-editor/plugins/dropdown-menu';
import DropzonePlugin from 'swagger-editor/plugins/dropzone';
import VersionsPlugin from 'swagger-editor/plugins/versions';
import EditorTextareaPlugin from 'swagger-editor/plugins/editor-textarea';
import EditorMonacoPlugin from 'swagger-editor/plugins/editor-monaco';
import EditorMonacoLanguageApiDOMPlugin from 'swagger-editor/plugins/editor-monaco-language-apidom';
import EditorContentReadOnlyPlugin from 'swagger-editor/plugins/editor-content-read-only';
import EditorContentOriginPlugin from 'swagger-editor/plugins/editor-content-origin';
import EditorContentTypePlugin from 'swagger-editor/plugins/editor-content-type';
import EditorContentPersistencePlugin from 'swagger-editor/plugins/editor-content-persistence';
import EditorContentFixturesPlugin from 'swagger-editor/plugins/editor-content-fixtures';
import EditorPreviewPlugin from 'swagger-editor/plugins/editor-preview';
import EditorPreviewSwaggerUIPlugin from 'swagger-editor/plugins/editor-preview-swagger-ui';
import EditorPreviewAsyncAPIPlugin from 'swagger-editor/plugins/editor-preview-asyncapi';
import EditorPreviewApiDesignSystemsPlugin from 'swagger-editor/plugins/editor-preview-api-design-systems';
import TopBarPlugin from 'swagger-editor/plugins/top-bar';
import SplashScreenPlugin from 'swagger-editor/plugins/splash-screen';
import LayoutPlugin from 'swagger-editor/plugins/layout';
import EditorSafeRenderPlugin from 'swagger-editor/plugins/editor-safe-render';
const SwaggerEditor = () => {
return (
<SwaggerUI
url={url}
plugins={[
ModalsPlugin,
DialogsPlugin,
DropdownMenuPlugin,
DropzonePlugin,
VersionsPlugin,
EditorTextareaPlugin,
EditorMonacoPlugin,
EditorMonacoLanguageApiDOMPlugin,
EditorContentReadOnlyPlugin,
EditorContentOriginPlugin,
EditorContentTypePlugin,
EditorContentPersistencePlugin,
EditorContentFixturesPlugin,
EditorPreviewPlugin,
EditorPreviewSwaggerUIPlugin,
EditorPreviewAsyncAPIPlugin,
EditorPreviewApiDesignSystemsPlugin,
TopBarPlugin,
SplashScreenPlugin,
LayoutPlugin,
EditorSafeRenderPlugin,
]}
layout="StandaloneLayout"
/>
);
};
ReactDOM.render(<SwaggerEditor />, document.getElementById('swagger-editor'));
SwaggerEditor is available as a pre-built docker image hosted on DockerHub.
$ docker pull swaggerapi/swagger-editor:next-v5
$ docker run -d -p 8080:80 swaggerapi/swagger-editor:next-v5
Privileged image:
$ npm run build:app
$ docker build . -t swaggerapi/swagger-editor:next-v5
$ docker run -d -p 8080:80 swaggerapi/swagger-editor:next-v5
Now open your browser at http://localhost:8080/.
Unprivileged image:
$ npm run build:app
$ docker build . -f Dockerfile.unprivileged -t swaggerapi/swagger-editor:next-v5-unprivileged
$ docker run -d -p 8080:8080 swaggerapi/swagger-editor:next-v5-unprivileged
Now open your browser at http://localhost:8080/.
No custom environment variables are currently supported by SwaggerEditor.
SwaggerEditor is licensed under Apache 2.0 license. SwaggerEditor comes with an explicit NOTICE file containing additional legal notifications and information.
This project uses REUSE specification that defines a standardized method for declaring copyright and licensing for software projects.
Software Bill Of materials is available in this repository dependency graph.
Click on Export SBOM button to download the SBOM in SPDX format.
FAQs
Swagger Editor
The npm package swagger-editor receives a total of 5,326 weekly downloads. As such, swagger-editor popularity was classified as popular.
We found that swagger-editor demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Newly introduced telemetry in devenv 1.4 sparked a backlash over privacy concerns, leading to the removal of its AI-powered feature after strong community pushback.
Security News
TC39 met in Seattle and advanced 9 JavaScript proposals, including three to Stage 4, introducing new features and enhancements for a future ECMAScript release.
Security News
Deno 2.2 enhances Node.js compatibility, improves dependency management, adds OpenTelemetry support, and expands linting and task automation for developers.