p3x-json2xls-worker-thread
v2024.4.121
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๐ Convert JSON to Excel XLSX with offloading the constructing the data using a worker thread
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๐ Convert JSON to Excel XLSX with offloading the constructing the data using a worker thread v2024.4.121
Bugs are evidentโข - MATRIX๏ธ
NodeJS LTS is supported
Built on NodeJs version
v22.1.0
Description
Utility to convert json to an excel file, based on Node-Excel-Export using a worker thread by not blocking the NodeJs event loop using async
functions and options.
This is a totally fork of the json2xls, but the XLSX constructing can be CPU intensive so we are offloading the XLSX constructing using a worker thread.
Of course, when using a worker thread, the execution is about 20-25ms longer, than when we are in the event loop, so the worker thread is valid when we are generating a big dataset.
Installation
npm install p3x-json2xls-worker-thread
Usage
Use to save as file:
const json2xls = require('p3x-json2xls-worker-thread')
const fs = require('fs').promises
const json = {
foo: 'bar',
qux: 'moo',
poo: 123,
stux: new Date()
}
const executAsync = async() => {
try {
//
let nodeExcelOptions = undefined
/*
The following options are supported:
- style: a styles xml file, see <https://github.com/functionscope/Node-Excel-Export>
- fields: either an array or map containing field configuration:
- array: a list of names of fields to be exported, in that order
- object: a map of names of fields to be exported and the types of those fields. Supported types are 'number','string','bool'
*/
if (ifSomeConditionIsTrue) {
nodeExcelOptions = {
fields: ['poo']
}
}
const options = {
output: 'binary' /* default */ || 'base64',
nodeExcel: nodeExcelOptions
}
const xlsBinary = await json2xls(json, options)
await fs.writeFile('data.xlsx', xlsBinary, 'binary');
} catch(e) {
// handle error
console.error(e)
}
}
executAsync()
Or use as express middleware. It adds a convenience xls
method to the response object to immediately output an excel as download.
const json2xls = require('p3x-json2xls-worker-thread')
const jsonArr = [{
foo: 'bar',
qux: 'moo',
poo: 123,
stux: new Date()
},
{
foo: 'bar',
qux: 'moo',
poo: 345,
stux: new Date()
}];
app.use(json2xls.middleware);
app.get('/',function(req, res) {
res.xls('data.xlsx', jsonArr);
});
It is possible to block the event loop by using the sync
function eg.:
const json2xls = require('p3x-json2xls-worker-thread')
const json = {
foo: 'bar',
qux: 'moo',
poo: 123,
stux: new Date()
}
const xlsBinary = json2xls.sync(json, {
output: 'base64' // can be binary as well, just sugar...
})
console.log(xlsBinary)
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About My Domains
All my domains, including patrikx3.com and corifeus.com, are developed in my spare time. While you may encounter minor errors, the sites are generally stable and fully functional.
Versioning Policy
Version Structure: We follow a Major.Minor.Patch versioning scheme:
- Major: Corresponds to the current year.
- Minor: Set as 4 for releases from January to June, and 10 for July to December.
- Patch: Incremental, updated with each build.
Important Changes: Any breaking changes are prominently noted in the readme to keep you informed.
P3X-JSON2XLS-WORKER-THREAD Build v2024.4.121