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fast-json
Advanced tools
Changelog
v3.0.0
const { FastJson } = require('fast-json');
instead of const FastJson = require('fast-json');
.Readme
A lightning fast on the fly JSON parser able to return JSON values and structures from plain JSON as String
or Buffer
. It's much faster than JSON.parse() and doesn't require any extra memory allocation for the data processed.
npm install fast-json
const { FastJson } = require('fast-json');
const data = JSON.stringify({
ireland: {
people: [{ name: 'Alex' }, { name: 'John' }, { name: 'Cian' }],
},
spain: {
people: [{ name: 'Antonio' }, { name: 'Juan' }, { name: 'Pedro' }],
},
});
const fastJson = new FastJson();
// Path is a string representing a javascript object path
fastJson.on('ireland.people', (value) => {
console.log('ireland.people ->', value);
});
// Paths can be also an array of keys
fastJson.on(['spain', 'people', '1', 'name'], (value) => {
console.log(['spain', 'people', '1', 'name'], '->', value);
});
// Wildcards can be used to match all items in object or array
fastJson.on('spain.people[*].name', (value) => {
console.log('spain.people[*].name ->', value);
});
fastJson.on('*.people[*].name', (value) => {
console.log('*.people[*].name ->', value);
});
fastJson.write(data);
// The JSON can be string or Buffer
// fastJson.write(Buffer.from(data))
fastJson.on('ireland.people[1].name', (value) => {
console.log('ireland.people[1].name ->', value);
// Once we have all we need, we can skip the rest of the JSON to improve performance.
fastJson.skip();
});
// Path separator defines the keys separator on the listeners
const fastJson = new FastJson({ pathSeparator: '/' });
// In this case it allows keys having dots by using a different separator
fastJson.on('unknown.country/people/0/name', (value) => {
console.log('unknown.country/people/0/name ->', value);
});
JSON file citylots.json of 189MB from https://github.com/zemirco/sf-city-lots-json.
FAQs
A lightning fast on the fly JSON parser
The npm package fast-json receives a total of 456 weekly downloads. As such, fast-json popularity was classified as not popular.
We found that fast-json demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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