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[Fix] stringify: with arrayFormat: comma, properly include an exp…
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…licit `[]` on a single-item array

Properly fixes #434
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@ljharb
ljharb committed Jun 6, 2022
1 parent ba9703c commit 0e903c0
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Showing 3 changed files with 34 additions and 15 deletions.
2 changes: 1 addition & 1 deletion .eslintrc
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Expand Up @@ -15,7 +15,7 @@
"indent": [2, 4],
"max-lines-per-function": [2, { "max": 150 }],
"max-params": [2, 15],
"max-statements": [2, 52],
"max-statements": [2, 53],
"multiline-comment-style": 0,
"no-continue": 1,
"no-magic-numbers": 0,
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8 changes: 5 additions & 3 deletions lib/stringify.js
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Expand Up @@ -126,7 +126,7 @@ var stringify = function stringify(
for (var i = 0; i < valuesArray.length; ++i) {
valuesJoined += (i === 0 ? '' : ',') + formatter(encoder(valuesArray[i], defaults.encoder, charset, 'value', format));
}
return [formatter(keyValue) + (i === 1 ? '[]' : '') + '=' + valuesJoined];
return [formatter(keyValue) + (isArray(obj) && valuesArray.length === 1 ? '[]' : '') + '=' + valuesJoined];
}
return [formatter(keyValue) + '=' + formatter(encoder(obj, defaults.encoder, charset, 'value', format))];
}
Expand All @@ -150,6 +150,8 @@ var stringify = function stringify(
objKeys = sort ? keys.sort(sort) : keys;
}

var adjustedPrefix = generateArrayPrefix === 'comma' && isArray(obj) && obj.length === 1 ? prefix + '[]' : prefix;

for (var j = 0; j < objKeys.length; ++j) {
var key = objKeys[j];
var value = typeof key === 'object' && typeof key.value !== 'undefined' ? key.value : obj[key];
Expand All @@ -159,8 +161,8 @@ var stringify = function stringify(
}

var keyPrefix = isArray(obj)
? typeof generateArrayPrefix === 'function' ? generateArrayPrefix(prefix, key) : prefix
: prefix + (allowDots ? '.' + key : '[' + key + ']');
? typeof generateArrayPrefix === 'function' ? generateArrayPrefix(adjustedPrefix, key) : adjustedPrefix
: adjustedPrefix + (allowDots ? '.' + key : '[' + key + ']');

sideChannel.set(object, step);
var valueSideChannel = getSideChannel();
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39 changes: 28 additions & 11 deletions test/stringify.js
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Expand Up @@ -132,15 +132,32 @@ test('stringify()', function (t) {
});

t.test('stringifies an array value with one item vs multiple items', function (st) {
st.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'indices' }), 'a[0]=c');
st.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'brackets' }), 'a[]=c');
st.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'comma' }), 'a[]=c'); // so it parses back as an array
st.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true }), 'a[0]=c');
st.test('non-array item', function (s2t) {
s2t.equal(qs.stringify({ a: 'c' }, { encodeValuesOnly: true, arrayFormat: 'indices' }), 'a=c');
s2t.equal(qs.stringify({ a: 'c' }, { encodeValuesOnly: true, arrayFormat: 'brackets' }), 'a=c');
s2t.equal(qs.stringify({ a: 'c' }, { encodeValuesOnly: true, arrayFormat: 'comma' }), 'a=c');
s2t.equal(qs.stringify({ a: 'c' }, { encodeValuesOnly: true }), 'a=c');

st.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'indices' }), 'a[0]=c&a[1]=d');
st.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'brackets' }), 'a[]=c&a[]=d');
st.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'comma' }), 'a=c,d');
st.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true }), 'a[0]=c&a[1]=d');
s2t.end();
});

st.test('array with a single item', function (s2t) {
s2t.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'indices' }), 'a[0]=c');
s2t.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'brackets' }), 'a[]=c');
s2t.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true, arrayFormat: 'comma' }), 'a[]=c'); // so it parses back as an array
s2t.equal(qs.stringify({ a: ['c'] }, { encodeValuesOnly: true }), 'a[0]=c');

s2t.end();
});

st.test('array with multiple items', function (s2t) {
s2t.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'indices' }), 'a[0]=c&a[1]=d');
s2t.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'brackets' }), 'a[]=c&a[]=d');
s2t.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true, arrayFormat: 'comma' }), 'a=c,d');
s2t.equal(qs.stringify({ a: ['c', 'd'] }, { encodeValuesOnly: true }), 'a[0]=c&a[1]=d');

s2t.end();
});

st.end();
});
Expand Down Expand Up @@ -362,12 +379,12 @@ test('stringify()', function (t) {
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'indices' }), 'b[0]=&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'brackets' }), 'b[]=&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'repeat' }), 'b=&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'comma' }), 'b=&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'comma' }), 'b[]=&c=c');
// with strictNullHandling
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'indices', strictNullHandling: true }), 'b[0]&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'brackets', strictNullHandling: true }), 'b[]&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'repeat', strictNullHandling: true }), 'b&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'comma', strictNullHandling: true }), 'b&c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'comma', strictNullHandling: true }), 'b[]&c=c');
// with skipNulls
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'indices', skipNulls: true }), 'c=c');
st.equal(qs.stringify({ a: [], b: [null], c: 'c' }, { encode: false, arrayFormat: 'brackets', skipNulls: true }), 'c=c');
Expand Down Expand Up @@ -695,7 +712,7 @@ test('stringify()', function (t) {
arrayFormat: 'comma'
}
),
'a=' + date.getTime(),
'a%5B%5D=' + date.getTime(),
'works with arrayFormat comma'
);

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