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+# http-assert
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][travis-image]][travis-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Assert with status codes. Like ctx.throw() in Koa, but with a guard.
+
+## Install
+
+This is a [Node.js](https://nodejs.org/en/) module available through the
+[npm registry](https://www.npmjs.com/). Installation is done using the
+[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
+
+```bash
+$ npm install http-assert
+```
+
+## Example
+```js
+var assert = require('http-assert')
+var ok = require('assert')
+
+var username = 'foobar' // username from request
+
+try {
+  assert(username === 'fjodor', 401, 'authentication failed')
+} catch (err) {
+  ok(err.status === 401)
+  ok(err.message === 'authentication failed')
+  ok(err.expose)
+}
+```
+
+## API
+
+The API of this module is intended to be similar to the
+[Node.js `assert` module](https://nodejs.org/dist/latest/docs/api/assert.html).
+
+Each function will throw an instance of `HttpError` from
+[the `http-errors` module](https://www.npmjs.com/package/http-errors)
+when the assertion fails.
+
+### assert(value, [status], [message], [properties])
+
+Tests if `value` is truthy. If `value` is not truthy, an `HttpError`
+is thrown that is constructed with the given `status`, `message`,
+and `properties`.
+
+### assert.deepEqual(a, b, [status], [message], [properties])
+
+Tests for deep equality between `a` and `b`. Primitive values are
+compared with the Abstract Equality Comparison (`==`). If `a` and `b`
+are not equal, an `HttpError` is thrown that is constructed with the
+given `status`, `message`, and `properties`.
+
+### assert.equal(a, b, [status], [message], [properties])
+
+Tests shallow, coercive equality between `a` and `b` using the Abstract
+Equality Comparison (`==`). If `a` and `b` are not equal, an `HttpError`
+is thrown that is constructed with the given `status`, `message`,
+and `properties`.
+
+### assert.notDeepEqual(a, b, [status], [message], [properties])
+
+Tests for deep equality between `a` and `b`. Primitive values are
+compared with the Abstract Equality Comparison (`==`). If `a` and `b`
+are equal, an `HttpError` is thrown that is constructed with the given
+`status`, `message`, and `properties`.
+
+### assert.notEqual(a, b, [status], [message], [properties])
+
+Tests shallow, coercive equality between `a` and `b` using the Abstract
+Equality Comparison (`==`). If `a` and `b` are equal, an `HttpError` is
+thrown that is constructed with the given `status`, `message`, and
+`properties`.
+
+### assert.notStrictEqual(a, b, [status], [message], [properties])
+
+Tests strict equality between `a` and `b` as determined by the SameValue
+Comparison (`===`). If `a` and `b` are equal, an `HttpError` is thrown
+that is constructed with the given `status`, `message`, and `properties`.
+
+### assert.ok(value, [status], [message], [properties])
+
+Tests if `value` is truthy. If `value` is not truthy, an `HttpError`
+is thrown that is constructed with the given `status`, `message`,
+and `properties`.
+
+### assert.strictEqual(a, b, [status], [message], [properties])
+
+Tests strict equality between `a` and `b` as determined by the SameValue
+Comparison (`===`). If `a` and `b` are not equal, an `HttpError`
+is thrown that is constructed with the given `status`, `message`,
+and `properties`.
+
+## Licence
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/http-assert.svg
+[npm-url]: https://npmjs.org/package/http-assert
+[node-version-image]: https://img.shields.io/node/v/http-assert.svg
+[node-version-url]: https://nodejs.org/en/download/
+[travis-image]: https://img.shields.io/travis/jshttp/http-assert/master.svg
+[travis-url]: https://travis-ci.org/jshttp/http-assert
+[coveralls-image]: https://img.shields.io/coveralls/jshttp/http-assert/master.svg
+[coveralls-url]: https://coveralls.io/r/jshttp/http-assert
+[downloads-image]: https://img.shields.io/npm/dm/http-assert.svg
+[downloads-url]: https://npmjs.org/package/http-assert