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# fast-querystring

[](https://codecov.io/gh/anonrig/fast-querystring)
[](https://www.npmjs.com/package/fast-querystring)
Fast query-string parser and stringifier to replace the legacy `node:querystring` module.
### Installation
```
npm i fast-querystring
```
### Features
- Supports both `parse` and `stringify` methods from `node:querystring` module
- Parsed object does not have prototype methods
- Uses `&` separator as default
- Supports only input of type `string`
- Supports repeating keys in query string
- `foo=bar&foo=baz` parses into `{foo: ['bar', 'baz']}`
- Supports pairs with missing values
- `foo=bar&hola` parses into `{foo: 'bar', hola: ''}`
- Stringify does not support nested values (just like `node:querystring`)
### Usage
```javascript
const qs = require('fast-querystring')
// Parsing a querystring
console.log(qs.parse('hello=world&foo=bar&values=v1&values=v2'))
// {
// hello: 'world',
// foo: 'bar',
// values: ['v1', 'v2']
// }
// Stringifying an object
console.log(qs.stringify({ foo: ['bar', 'baz'] }))
// 'foo=bar&foo=baz'
```
### Benchmark
All benchmarks are run using Node.js v20.2.0 running on M1 Max.
- Parsing a query-string
```
> node benchmark/parse.mjs
βββββββββββββββββββββββββββββββββββββββββββ€ββββββββββ€ββββββββββββββββββββ€ββββββββββββ
β Slower tests β Samples β Result β Tolerance β
βββββββββββββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β query-string β 10000 β 273968.62 op/sec β Β± 1.48 % β
β qs β 9999 β 324118.68 op/sec β Β± 0.99 % β
β querystringify β 1000 β 410157.64 op/sec β Β± 0.68 % β
β @aws-sdk/querystring-parser β 1000 β 431465.20 op/sec β Β± 0.83 % β
β URLSearchParams-with-Object.fromEntries β 5000 β 833939.19 op/sec β Β± 0.97 % β
β URLSearchParams-with-construct β 10000 β 980017.92 op/sec β Β± 2.42 % β
β node:querystring β 10000 β 1068165.86 op/sec β Β± 3.41 % β
β querystringparser β 3000 β 1384001.31 op/sec β Β± 0.95 % β
βββββββββββββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β Fastest test β Samples β Result β Tolerance β
βββββββββββββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β fast-querystring β 10000 β 1584458.62 op/sec β Β± 2.64 % β
βββββββββββββββββββββββββββββββββββββββββββ§ββββββββββ§ββββββββββββββββββββ§ββββββββββββ
```
- Stringify a query-string
```
> node benchmark/stringify.mjs
ββββββββββββββββββββββββββββββββ€ββββββββββ€ββββββββββββββββββββ€ββββββββββββ
β Slower tests β Samples β Result β Tolerance β
ββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β query-string β 10000 β 314662.25 op/sec β Β± 1.08 % β
β qs β 9500 β 353621.74 op/sec β Β± 0.98 % β
β http-querystring-stringify β 10000 β 372189.04 op/sec β Β± 1.48 % β
β @aws-sdk/querystring-builder β 10000 β 411658.63 op/sec β Β± 1.67 % β
β URLSearchParams β 10000 β 454438.85 op/sec β Β± 1.32 % β
β querystringparser β 10000 β 455615.18 op/sec β Β± 4.22 % β
β querystringify β 10000 β 879020.96 op/sec β Β± 2.12 % β
β querystringify-ts β 10000 β 879134.48 op/sec β Β± 2.19 % β
β node:querystring β 10000 β 1244505.97 op/sec β Β± 2.12 % β
ββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β Fastest test β Samples β Result β Tolerance β
ββββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββββΌββββββββββββ’
β fast-querystring β 10000 β 1953717.60 op/sec β Β± 3.16 % β
ββββββββββββββββββββββββββββββββ§ββββββββββ§ββββββββββββββββββββ§ββββββββββββ
```
- Importing package.
```
> node benchmark/import.mjs
βββββββββββββββββββββββββββββββ€ββββββββββ€ββββββββββββββββββ€ββββββββββββ
β Slower tests β Samples β Result β Tolerance β
βββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββΌββββββββββββ’
β @aws-sdk/querystring-parser β 1000 β 12360.51 op/sec β Β± 0.57 % β
β qs β 1000 β 14507.74 op/sec β Β± 0.36 % β
β querystringify β 1000 β 14750.53 op/sec β Β± 0.39 % β
β query-string β 1000 β 16335.05 op/sec β Β± 0.87 % β
β querystringparser β 1000 β 17018.50 op/sec β Β± 0.42 % β
βββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββΌββββββββββββ’
β Fastest test β Samples β Result β Tolerance β
βββββββββββββββββββββββββββββββΌββββββββββΌββββββββββββββββββΌββββββββββββ’
β fast-querystring β 2500 β 74605.83 op/sec β Β± 0.91 % β
βββββββββββββββββββββββββββββββ§ββββββββββ§ββββββββββββββββββ§ββββββββββββ
```
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