Support Array with the `json` option (#335)

index.js

@@ -315,17 +315,18 @@ function normalizeArguments(url, opts) {
 			throw new TypeError('options.body must be a ReadableStream, string, Buffer or plain Object');
 		}
 
-		if ((opts.form || opts.json) && !isPlainObj(body)) {
-			throw new TypeError('options.body must be a plain Object when options.form or options.json is used');
+		const canBodyBeStringified = isPlainObj(body) || Array.isArray(body);
+		if ((opts.form || opts.json) && !canBodyBeStringified) {
+			throw new TypeError('options.body must be a plain Object or Array when options.form or options.json is used');
 		}
 
 		if (isStream(body) && typeof body.getBoundary === 'function') {
 			// Special case for https://github.com/form-data/form-data
 			headers['content-type'] = headers['content-type'] || `multipart/form-data; boundary=${body.getBoundary()}`;
-		} else if (opts.form && isPlainObj(body)) {
+		} else if (opts.form && canBodyBeStringified) {
 			headers['content-type'] = headers['content-type'] || 'application/x-www-form-urlencoded';
 			opts.body = querystring.stringify(body);
-		} else if (opts.json && isPlainObj(body)) {
+		} else if (opts.json && canBodyBeStringified) {
 			headers['content-type'] = headers['content-type'] || 'application/json';
 			opts.body = JSON.stringify(body);
 		}

readme.md

@@ -110,7 +110,7 @@ Default: `false`
 
 If set to `true` and `Content-Type` header is not set, it will be set to `application/x-www-form-urlencoded`.
 
-`body` must be a plain object and will be stringified.
+`body` must be a plain object or array and will be stringified.
 
 ###### json
 
@@ -123,7 +123,7 @@ If set to `true` and `Content-Type` header is not set, it will be set to `applic
 
 Parse response body with `JSON.parse` and set `accept` header to `application/json`. If used in conjunction with the `form` option, the `body` will the stringified as querystring and the response parsed as JSON.
 
-`body` must be a plain object and will be stringified.
+`body` must be a plain object or array and will be stringified.
 
 ###### query
 

test/post.js

@@ -53,6 +53,14 @@ test('sends plain objects as forms', async t => {
 	t.is(body, 'such=wow');
 });
 
+test('sends arrays as forms', async t => {
+	const {body} = await got(s.url, {
+		body: ['such', 'wow'],
+		form: true
+	});
+	t.is(body, '0=such&1=wow');
+});
+
 test('sends plain objects as JSON', async t => {
 	const {body} = await got(s.url, {
 		body: {such: 'wow'},
@@ -61,6 +69,14 @@ test('sends plain objects as JSON', async t => {
 	t.deepEqual(body, {such: 'wow'});
 });
 
+test('sends arrays as JSON', async t => {
+	const {body} = await got(s.url, {
+		body: ['such', 'wow'],
+		json: true
+	});
+	t.deepEqual(body, ['such', 'wow']);
+});
+
 test('works with empty post response', async t => {
 	const {body} = await got(`${s.url}/empty`, {body: 'wow'});
 	t.is(body, '');
@@ -121,11 +137,11 @@ test('content-type header is not overriden when object in options.body', async t
 	t.is(headers['content-type'], 'doge');
 });
 
-test('throws when json body is not a plain object', async t => {
+test('throws when json body is not a plain object or array', async t => {
 	await t.throws(got(`${s.url}`, {body: '{}', json: true}), TypeError);
 });
 
-test('throws when form body is not a plain object', async t => {
+test('throws when form body is not a plain object or array', async t => {
 	await t.throws(got(`${s.url}`, {body: 'such=wow', form: true}), TypeError);
 });