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bson-json-transform
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A Node.js Transform for streaming Bson into Json.
With this you can convert a large BSON to a JSON without exchausting your available RAM.
Due to the fact that in JavaScript any number is always a IEEE 754 64-bit floating point value, there's a side-effect of whole numbers being limited to 53 bits. When being larger than that - they are kind of rounded and loses precision of the lower bits. That is - the magnitude stays, but you lose the ones, the tens, and then the hunderds and so on - and they become zeros.
We handle parsing Int64 values from BSON by synthesizing the Int64 values and simulating the printing to string. There are different ways to handle it:
You can use the preserveInt64
option to choose how you would like to go about it.
npm install --save bson-json-transform
The options you can pass are:
Name | Type | Default | Explanation |
---|---|---|---|
hasHeader | Boolean | true | Does the stream begin with a BSON length header? |
arrayOfBsons | Boolean | false | Try to parse sequential BSONs until data runs out |
preserveInt64 | `String | Boolean` | 'auto' |
var fs = require('fs');
var BsonJsonTransform = require('bson-json-reader');
fs
.createReadStream('my_data.bson')
.pipe(BsonJsonTransform({ preserveInt64: 'string' }))
.pipe(fs.createWriteStream('my_data.json'))
.on('end', function (data) {
console.log('No more data!');
});
If you have anything to contribute, or functionality that you lack - you are more than welcome to participate in this! If anyone wishes to contribute unit tests - that also would be great :-)
If you want to buy me a beer, you are very welcome to Thanks :-)
All the code here is under MIT license. Which means you could do virtually anything with the code. I will appreciate it very much if you keep an attribution where appropriate.
The MIT License (MIT)
Copyright (c) 2013 Daniel Cohen Gindi (danielgindi@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
FAQs
A Node.js Transform for streaming Bson into Json
The npm package bson-json-transform receives a total of 5 weekly downloads. As such, bson-json-transform popularity was classified as not popular.
We found that bson-json-transform 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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