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release](https://github.com/firstclasspostcodes/firstclasspostcodes-js/workflows/Build,%20test%20and%20release/badge.svg)\n\nThe Firstclasspostcodes Javascript library is compatible with both Node.JS and Browsers. \n\nThe library will work in all modern browsers and IE9+.\n\nAn identical API is provided for both the client and server side.\n\n## Documentation\nSee [@firstclasspostcodes/js API docs](https://docs.firstclasspostcodes.com/js/getting-started) for detailed usage and examples.\n\n## Installation\nInstall the package with:\n\n```\nnpm install @firstclasspostcodes/js\n```\n\nor directly in HTML with:\n\n```html\n\u003cscript src=\"https://js.firstclasspostcodes.com/v1.6.2.js\"\u003e\u003c/script\u003e\n```\n\n**Note on older browsers:** We recommend using a polyfill service, the following example covers all of the required language features:\n\n```html\n\u003cscript src=\"https://polyfill.io/v3/polyfill.min.js?features=Promise%2Cfetch%2CObject.assign\"\u003e\u003c/script\u003e\n```\n\n### Security\nWhere the libary is loaded on pages including sensitive information, we recommend using the [Subresource Integrity](https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity) security feature. \n\nEvery version of the library is accompanied by an SRI hash file, the hash can be accessed directly using:\n\n```sh\n$ curl https://js.firstclasspostcodes.com/v1.6.2.sri.txt # =\u003e \"sha256-45tfd... sha384-43567ytr...\"\n```\n\nYou can then update the above `\u003cscript\u003e` tag, adding the integrity attribute:\n\n```html\n\u003cscript src=\"https://js.firstclasspostcodes.com/v1.6.2.js\"\n        integrity=\"sha256-45tfd... sha384-43567ytr...\"\n        crossorigin=\"anonymous\"\u003e\u003c/script\u003e\n```\n\n## Usage\nYou need to configure the library to use your API Key which is available on your [dashboard](https://dashboard.firstclasspostcodes.com/key). Require the library using the key:\n\n```js\nconst client = require('@firstclasspostcodes/js')('fg3rfgy3345tgfAt3r');\n\nconst postcodeData = await client.getPostcode('sw13 8gh');\n```\n\nUsing ES modules looks a little different:\n\n```js\nimport Firstclasspostcodes from '@firstclasspostcodes/js';\n\nconst client = Firstclasspostcodes('fg3rfgy3345tgfAt3r');\n\n// ...\n```\n\n## Configuration\nThe library can be initialized with several options:\n\n```js\nconst client = Firstclasspostcodes('fg3r...', {\n  endpoint: 'https://api.firstclasspostcodes.com/data',\n  content: 'json',\n});\n```\n\n| Property | Default | Description |\n|:-----|:-----|:-----|\n| `endpoint` | `https://api.firstclasspostcodes.com/data` | The endpoint to be used. This can be overridden to use a private endpoint, or for testing purposes. |\n| `content` | `'json'` | The content key controls the type of response being received. `geo+json` can be used to receives responses in [GeoJSON](https://geojson.org/).\n\n## Events\nEvent handlers can be attached to the library using the Node.JS [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter) pattern. \n\nThe library does not currently support wildcards or regular expressions.\n\n```js\nconst client = Firstclasspostcodes('....');\n\nconst handler = (requestObj) =\u003e {\n  console.log(requestObj);\n};\n\nclient.on('request', handler);\n\nclient.once('response', (responseObj) =\u003e {\n  sendSignal(responseObj);\n});\n\nclient.off('request', handler);\n```\n\n| Event name | Description |\n|:-----|:-----|\n| `request` | Triggered before a request is sent. 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