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fast-json-stringify
Advanced tools
Readme
fast-json-stringify is x1-5 times faster than JSON.stringify()
.
It is particularly suited if you are sending small JSON payloads, the
advantages reduces on large payloads.
Benchmarks:
JSON.stringify array x 3,500 ops/sec ±0.91% (85 runs sampled)
fast-json-stringify array x 4,456 ops/sec ±1.68% (87 runs sampled)
JSON.stringify long string x 13,395 ops/sec ±0.88% (91 runs sampled)
fast-json-stringify long string x 95,488 ops/sec ±1.04% (90 runs sampled)
JSON.stringify short string x 5,059,316 ops/sec ±0.86% (92 runs sampled)
fast-json-stringify short string x 12,219,967 ops/sec ±1.16% (91 runs sampled)
JSON.stringify obj x 1,763,980 ops/sec ±1.30% (88 runs sampled)
fast-json-stringify obj x 5,085,148 ops/sec ±1.56% (89 runs sampled)
const fastJson = require('fast-json-stringify')
const stringify = fastJson({
title: 'Example Schema',
type: 'object',
properties: {
firstName: {
type: 'string'
},
lastName: {
type: 'string'
},
age: {
description: 'Age in years',
type: 'integer'
},
reg: {
type: 'string'
}
}
})
console.log(stringify({
firstName: 'Matteo',
lastName: 'Collina',
age: 32,
reg: /"([^"]|\\")*"/
}))
Build a stringify()
function based on
jsonschema.
Supported types:
'string'
'integer'
'number'
'array'
'object'
'boolean'
'null'
And nested ones, too.
Instance | Serialized as |
---|---|
Date | string via toISOString() |
RegExp | string |
You can set specific fields of an object as required in your schema, by adding the field name inside the required
array in your schema.
Example:
const schema = {
title: 'Example Schema with required field',
type: 'object',
properties: {
nickname: {
type: 'string'
},
mail: {
type: 'string'
}
},
required: ['mail']
}
If the object to stringify has not the required field(s), fast-json-stringify
will throw an error.
If a field is present in the schema (and is not required) but it is not present in the object to stringify, fast-json-stringify
will not write it in the final string.
Example:
const stringify = fastJson({
title: 'Example Schema',
type: 'object',
properties: {
nickname: {
type: 'string'
},
mail: {
type: 'string'
}
},
required: ['mail']
})
const obj = {
mail: 'mail@example.com'
}
console.log(stringify(obj)) // '{"mail":"mail@example.com"}'
fast-json-stringify
supports pattern properties as defined inside JSON schema.
patternProperties must be an object, where the key is a valid regex and the value is an object, declared in this way: { type: 'type' }
.
patternProperties will work only for the properties that are not explicitly listed in the properties object.
Example:
const stringify = fastJson({
title: 'Example Schema',
type: 'object',
properties: {
nickname: {
type: 'string'
}
},
patternProperties: {
'num': {
type: 'number'
},
'.*foo$': {
type: 'string'
}
}
})
const obj = {
nickname: 'nick',
matchfoo: 42,
otherfoo: 'str'
matchnum: 3
}
console.log(stringify(obj)) // '{"nickname":"nick","matchfoo":"42","otherfoo":"str","matchnum":3}'
This project was kindly sponsored by nearForm.
MIT
FAQs
Stringify your JSON at max speed
We found that fast-json-stringify demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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