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  "description": "A querystring parser that supports nesting and arrays, with a depth limit",
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  "readme": "# qs <sup>[![Version Badge][2]][1]</sup>\n\n[![Build Status][3]][4]\n[![dependency status][5]][6]\n[![dev dependency status][7]][8]\n[![License][license-image]][license-url]\n[![Downloads][downloads-image]][downloads-url]\n\n[![npm badge][11]][1]\n\nA querystring parsing and stringifying library with some added security.\n\nLead Maintainer: [Jordan Harband](https://github.com/ljharb)\n\nThe **qs** module was originally created and maintained by [TJ Holowaychuk](https://github.com/visionmedia/node-querystring).\n\n## Usage\n\n```javascript\nvar qs = require('qs');\nvar assert = require('assert');\n\nvar obj = qs.parse('a=c');\nassert.deepEqual(obj, { a: 'c' });\n\nvar str = qs.stringify(obj);\nassert.equal(str, 'a=c');\n```\n\n### Parsing Objects\n\n[](#preventEval)\n```javascript\nqs.parse(string, [options]);\n```\n\n**qs** allows you to create nested objects within your query strings, by surrounding the name of sub-keys with square brackets `[]`.\nFor example, the string `'foo[bar]=baz'` converts to:\n\n```javascript\nassert.deepEqual(qs.parse('foo[bar]=baz'), {\n    foo: {\n        bar: 'baz'\n    }\n});\n```\n\nWhen using the `plainObjects` option the parsed value is returned as a null object, created via `Object.create(null)` and as such you should be aware that prototype methods will not exist on it and a user may set those names to whatever value they like:\n\n```javascript\nvar nullObject = qs.parse('a[hasOwnProperty]=b', { plainObjects: true });\nassert.deepEqual(nullObject, { a: { hasOwnProperty: 'b' } });\n```\n\nBy default parameters that would overwrite properties on the object prototype are ignored, if you wish to keep the data from those fields either use `plainObjects` as mentioned above, or set `allowPrototypes` to `true` which will allow user input to overwrite those properties. *WARNING* It is generally a bad idea to enable this option as it can cause problems when attempting to use the properties that have been overwritten. Always be careful with this option.\n\n```javascript\nvar protoObject = qs.parse('a[hasOwnProperty]=b', { allowPrototypes: true });\nassert.deepEqual(protoObject, { a: { hasOwnProperty: 'b' } });\n```\n\nURI encoded strings work too:\n\n```javascript\nassert.deepEqual(qs.parse('a%5Bb%5D=c'), {\n    a: { b: 'c' }\n});\n```\n\nYou can also nest your objects, like `'foo[bar][baz]=foobarbaz'`:\n\n```javascript\nassert.deepEqual(qs.parse('foo[bar][baz]=foobarbaz'), {\n    foo: {\n        bar: {\n            baz: 'foobarbaz'\n        }\n    }\n});\n```\n\nBy default, when nesting objects **qs** will only parse up to 5 children deep. This means if you attempt to parse a string like\n`'a[b][c][d][e][f][g][h][i]=j'` your resulting object will be:\n\n```javascript\nvar expected = {\n    a: {\n        b: {\n            c: {\n                d: {\n                    e: {\n                        f: {\n                            '[g][h][i]': 'j'\n                        }\n                    }\n                }\n            }\n        }\n    }\n};\nvar string = 'a[b][c][d][e][f][g][h][i]=j';\nassert.deepEqual(qs.parse(string), expected);\n```\n\nThis depth can be overridden by passing a `depth` option to `qs.parse(string, [options])`:\n\n```javascript\nvar deep = qs.parse('a[b][c][d][e][f][g][h][i]=j', { depth: 1 });\nassert.deepEqual(deep, { a: { b: { '[c][d][e][f][g][h][i]': 'j' } } });\n```\n\nThe depth limit helps mitigate abuse when **qs** is used to parse user input, and it is recommended to keep it a reasonably small number.\n\nFor similar reasons, by default **qs** will only parse up to 1000 parameters. This can be overridden by passing a `parameterLimit` option:\n\n```javascript\nvar limited = qs.parse('a=b&c=d', { parameterLimit: 1 });\nassert.deepEqual(limited, { a: 'b' });\n```\n\nTo bypass the leading question mark, use `ignoreQueryPrefix`:\n\n```javascript\nvar prefixed = qs.parse('?a=b&c=d', { ignoreQueryPrefix: true });\nassert.deepEqual(prefixed, { a: 'b', c: 'd' });\n```\n\nAn optional delimiter can also be passed:\n\n```javascript\nvar delimited = qs.parse('a=b;c=d', { delimiter: ';' });\nassert.deepEqual(delimited, { a: 'b', c: 'd' });\n```\n\nDelimiters can be a regular expression too:\n\n```javascript\nvar regexed = qs.parse('a=b;c=d,e=f', { delimiter: /[;,]/ });\nassert.deepEqual(regexed, { a: 'b', c: 'd', e: 'f' });\n```\n\nOption `allowDots` can be used to enable dot notation:\n\n```javascript\nvar withDots = qs.parse('a.b=c', { allowDots: true });\nassert.deepEqual(withDots, { a: { b: 'c' } });\n```\n\n### Parsing Arrays\n\n**qs** can also parse arrays using a similar `[]` notation:\n\n```javascript\nvar withArray = qs.parse('a[]=b&a[]=c');\nassert.deepEqual(withArray, { a: ['b', 'c'] });\n```\n\nYou may specify an index as well:\n\n```javascript\nvar withIndexes = qs.parse('a[1]=c&a[0]=b');\nassert.deepEqual(withIndexes, { a: ['b', 'c'] });\n```\n\nNote that the only difference between an index in an array and a key in an object is that the value between the brackets must be a number\nto create an array. When creating arrays with specific indices, **qs** will compact a sparse array to only the existing values preserving\ntheir order:\n\n```javascript\nvar noSparse = qs.parse('a[1]=b&a[15]=c');\nassert.deepEqual(noSparse, { a: ['b', 'c'] });\n```\n\nNote that an empty string is also a value, and will be preserved:\n\n```javascript\nvar withEmptyString = qs.parse('a[]=&a[]=b');\nassert.deepEqual(withEmptyString, { a: ['', 'b'] });\n\nvar withIndexedEmptyString = qs.parse('a[0]=b&a[1]=&a[2]=c');\nassert.deepEqual(withIndexedEmptyString, { a: ['b', '', 'c'] });\n```\n\n**qs** will also limit specifying indices in an array to a maximum index of `20`. Any array members with an index of greater than `20` will\ninstead be converted to an object with the index as the key:\n\n```javascript\nvar withMaxIndex = qs.parse('a[100]=b');\nassert.deepEqual(withMaxIndex, { a: { '100': 'b' } });\n```\n\nThis limit can be overridden by passing an `arrayLimit` option:\n\n```javascript\nvar withArrayLimit = qs.parse('a[1]=b', { arrayLimit: 0 });\nassert.deepEqual(withArrayLimit, { a: { '1': 'b' } });\n```\n\nTo disable array parsing entirely, set `parseArrays` to `false`.\n\n```javascript\nvar noParsingArrays = qs.parse('a[]=b', { parseArrays: false });\nassert.deepEqual(noParsingArrays, { a: { '0': 'b' } });\n```\n\nIf you mix notations, **qs** will merge the two items into an object:\n\n```javascript\nvar mixedNotation = qs.parse('a[0]=b&a[b]=c');\nassert.deepEqual(mixedNotation, { a: { '0': 'b', b: 'c' } });\n```\n\nYou can also create arrays of objects:\n\n```javascript\nvar arraysOfObjects = qs.parse('a[][b]=c');\nassert.deepEqual(arraysOfObjects, { a: [{ b: 'c' }] });\n```\n\n### Stringifying\n\n[](#preventEval)\n```javascript\nqs.stringify(object, [options]);\n```\n\nWhen stringifying, **qs** by default URI encodes output. Objects are stringified as you would expect:\n\n```javascript\nassert.equal(qs.stringify({ a: 'b' }), 'a=b');\nassert.equal(qs.stringify({ a: { b: 'c' } }), 'a%5Bb%5D=c');\n```\n\nThis encoding can be disabled by setting the `encode` option to `false`:\n\n```javascript\nvar unencoded = qs.stringify({ a: { b: 'c' } }, { encode: false });\nassert.equal(unencoded, 'a[b]=c');\n```\n\nEncoding can be disabled for keys by setting the `encodeValuesOnly` option to `true`:\n```javascript\nvar encodedValues = qs.stringify(\n    { a: 'b', c: ['d', 'e=f'], f: [['g'], ['h']] },\n    { encodeValuesOnly: true }\n);\nassert.equal(encodedValues,'a=b&c[0]=d&c[1]=e%3Df&f[0][0]=g&f[1][0]=h');\n```\n\nThis encoding can also be replaced by a custom encoding method set as `encoder` option:\n\n```javascript\nvar encoded = qs.stringify({ a: { b: 'c' } }, { encoder: function (str) {\n    // Passed in values `a`, `b`, `c`\n    return // Return encoded string\n}})\n```\n\n_(Note: the `encoder` option does not apply if `encode` is `false`)_\n\nAnalogue to the `encoder` there is a `decoder` option for `parse` to override decoding of properties and values:\n\n```javascript\nvar decoded = qs.parse('x=z', { decoder: function (str) {\n    // Passed in values `x`, `z`\n    return // Return decoded string\n}})\n```\n\nExamples beyond this point will be shown as though the output is not URI encoded for clarity. Please note that the return values in these cases *will* be URI encoded during real usage.\n\nWhen arrays are stringified, by default they are given explicit indices:\n\n```javascript\nqs.stringify({ a: ['b', 'c', 'd'] });\n// 'a[0]=b&a[1]=c&a[2]=d'\n```\n\nYou may override this by setting the `indices` option to `false`:\n\n```javascript\nqs.stringify({ a: ['b', 'c', 'd'] }, { indices: false });\n// 'a=b&a=c&a=d'\n```\n\nYou may use the `arrayFormat` option to specify the format of the output array:\n\n```javascript\nqs.stringify({ a: ['b', 'c'] }, { arrayFormat: 'indices' })\n// 'a[0]=b&a[1]=c'\nqs.stringify({ a: ['b', 'c'] }, { arrayFormat: 'brackets' })\n// 'a[]=b&a[]=c'\nqs.stringify({ a: ['b', 'c'] }, { arrayFormat: 'repeat' })\n// 'a=b&a=c'\n```\n\nWhen objects are stringified, by default they use bracket notation:\n\n```javascript\nqs.stringify({ a: { b: { c: 'd', e: 'f' } } });\n// 'a[b][c]=d&a[b][e]=f'\n```\n\nYou may override this to use dot notation by setting the `allowDots` option to `true`:\n\n```javascript\nqs.stringify({ a: { b: { c: 'd', e: 'f' } } }, { allowDots: true });\n// 'a.b.c=d&a.b.e=f'\n```\n\nEmpty strings and null values will omit the value, but the equals sign (=) remains in place:\n\n```javascript\nassert.equal(qs.stringify({ a: '' }), 'a=');\n```\n\nKey with no values (such as an empty object or array) will return nothing:\n\n```javascript\nassert.equal(qs.stringify({ a: [] }), '');\nassert.equal(qs.stringify({ a: {} }), '');\nassert.equal(qs.stringify({ a: [{}] }), '');\nassert.equal(qs.stringify({ a: { b: []} }), '');\nassert.equal(qs.stringify({ a: { b: {}} }), '');\n```\n\nProperties that are set to `undefined` will be omitted entirely:\n\n```javascript\nassert.equal(qs.stringify({ a: null, b: undefined }), 'a=');\n```\n\nThe query string may optionally be prepended with a question mark:\n\n```javascript\nassert.equal(qs.stringify({ a: 'b', c: 'd' }, { addQueryPrefix: true }), '?a=b&c=d');\n```\n\nThe delimiter may be overridden with stringify as well:\n\n```javascript\nassert.equal(qs.stringify({ a: 'b', c: 'd' }, { delimiter: ';' }), 'a=b;c=d');\n```\n\nIf you only want to override the serialization of `Date` objects, you can provide a `serializeDate` option:\n\n```javascript\nvar date = new Date(7);\nassert.equal(qs.stringify({ a: date }), 'a=1970-01-01T00:00:00.007Z'.replace(/:/g, '%3A'));\nassert.equal(\n    qs.stringify({ a: date }, { serializeDate: function (d) { return d.getTime(); } }),\n    'a=7'\n);\n```\n\nYou may use the `sort` option to affect the order of parameter keys:\n\n```javascript\nfunction alphabeticalSort(a, b) {\n    return a.localeCompare(b);\n}\nassert.equal(qs.stringify({ a: 'c', z: 'y', b : 'f' }, { sort: alphabeticalSort }), 'a=c&b=f&z=y');\n```\n\nFinally, you can use the `filter` option to restrict which keys will be included in the stringified output.\nIf you pass a function, it will be called for each key to obtain the replacement value. Otherwise, if you\npass an array, it will be used to select properties and array indices for stringification:\n\n```javascript\nfunction filterFunc(prefix, value) {\n    if (prefix == 'b') {\n        // Return an `undefined` value to omit a property.\n        return;\n    }\n    if (prefix == 'e[f]') {\n        return value.getTime();\n    }\n    if (prefix == 'e[g][0]') {\n        return value * 2;\n    }\n    return value;\n}\nqs.stringify({ a: 'b', c: 'd', e: { f: new Date(123), g: [2] } }, { filter: filterFunc });\n// 'a=b&c=d&e[f]=123&e[g][0]=4'\nqs.stringify({ a: 'b', c: 'd', e: 'f' }, { filter: ['a', 'e'] });\n// 'a=b&e=f'\nqs.stringify({ a: ['b', 'c', 'd'], e: 'f' }, { filter: ['a', 0, 2] });\n// 'a[0]=b&a[2]=d'\n```\n\n### Handling of `null` values\n\nBy default, `null` values are treated like empty strings:\n\n```javascript\nvar withNull = qs.stringify({ a: null, b: '' });\nassert.equal(withNull, 'a=&b=');\n```\n\nParsing does not distinguish between parameters with and without equal signs. Both are converted to empty strings.\n\n```javascript\nvar equalsInsensitive = qs.parse('a&b=');\nassert.deepEqual(equalsInsensitive, { a: '', b: '' });\n```\n\nTo distinguish between `null` values and empty strings use the `strictNullHandling` flag. In the result string the `null`\nvalues have no `=` sign:\n\n```javascript\nvar strictNull = qs.stringify({ a: null, b: '' }, { strictNullHandling: true });\nassert.equal(strictNull, 'a&b=');\n```\n\nTo parse values without `=` back to `null` use the `strictNullHandling` flag:\n\n```javascript\nvar parsedStrictNull = qs.parse('a&b=', { strictNullHandling: true });\nassert.deepEqual(parsedStrictNull, { a: null, b: '' });\n```\n\nTo completely skip rendering keys with `null` values, use the `skipNulls` flag:\n\n```javascript\nvar nullsSkipped = qs.stringify({ a: 'b', c: null}, { skipNulls: true });\nassert.equal(nullsSkipped, 'a=b');\n```\n\n### Dealing with special character sets\n\nBy default the encoding and decoding of characters is done in `utf-8`. If you\nwish to encode querystrings to a different character set (i.e.\n[Shift JIS](https://en.wikipedia.org/wiki/Shift_JIS)) you can use the\n[`qs-iconv`](https://github.com/martinheidegger/qs-iconv) library:\n\n```javascript\nvar encoder = require('qs-iconv/encoder')('shift_jis');\nvar shiftJISEncoded = qs.stringify({ a: 'こんにちは！' }, { encoder: encoder });\nassert.equal(shiftJISEncoded, 'a=%82%B1%82%F1%82%C9%82%BF%82%CD%81I');\n```\n\nThis also works for decoding of query strings:\n\n```javascript\nvar decoder = require('qs-iconv/decoder')('shift_jis');\nvar obj = qs.parse('a=%82%B1%82%F1%82%C9%82%BF%82%CD%81I', { decoder: decoder });\nassert.deepEqual(obj, { a: 'こんにちは！' });\n```\n\n### RFC 3986 and RFC 1738 space encoding\n\nRFC3986 used as default option and encodes ' ' to *%20* which is backward compatible.\nIn the same time, output can be stringified as per RFC1738 with ' ' equal to '+'.\n\n```\nassert.equal(qs.stringify({ a: 'b c' }), 'a=b%20c');\nassert.equal(qs.stringify({ a: 'b c' }, { format : 'RFC3986' }), 'a=b%20c');\nassert.equal(qs.stringify({ a: 'b c' }, { format : 'RFC1738' }), 'a=b+c');\n```\n\n[1]: https://npmjs.org/package/qs\n[2]: http://versionbadg.es/ljharb/qs.svg\n[3]: https://api.travis-ci.org/ljharb/qs.svg\n[4]: https://travis-ci.org/ljharb/qs\n[5]: https://david-dm.org/ljharb/qs.svg\n[6]: https://david-dm.org/ljharb/qs\n[7]: https://david-dm.org/ljharb/qs/dev-status.svg\n[8]: https://david-dm.org/ljharb/qs?type=dev\n[9]: https://ci.testling.com/ljharb/qs.png\n[10]: https://ci.testling.com/ljharb/qs\n[11]: https://nodei.co/npm/qs.png?downloads=true&stars=true\n[license-image]: http://img.shields.io/npm/l/qs.svg\n[license-url]: LICENSE\n[downloads-image]: http://img.shields.io/npm/dm/qs.svg\n[downloads-url]: http://npm-stat.com/charts.html?package=qs\n",
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