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json-stream-stringify
Advanced tools
The json-stream-stringify npm package is designed to convert JavaScript objects into JSON strings in a memory-efficient manner by streaming the output. This is particularly useful for handling large objects that might otherwise consume too much memory if converted to JSON all at once.
Basic Usage
This feature demonstrates the basic usage of the json-stream-stringify package. It shows how to create a stream from a large JavaScript object and pipe it to a file, thereby converting the object to a JSON string in a memory-efficient way.
const JSONStreamStringify = require('json-stream-stringify');
const fs = require('fs');
const largeObject = { /* large object data */ };
const jsonStringifyStream = new JSONStreamStringify(largeObject);
jsonStringifyStream.pipe(fs.createWriteStream('output.json'));
Custom Replacer Function
This feature demonstrates how to use a custom replacer function with json-stream-stringify. The replacer function can be used to filter or modify the values being stringified. In this example, all string properties are excluded from the output.
const JSONStreamStringify = require('json-stream-stringify');
const fs = require('fs');
const largeObject = { /* large object data */ };
const replacer = (key, value) => {
if (typeof value === 'string') {
return undefined; // Exclude all string properties
}
return value;
};
const jsonStringifyStream = new JSONStreamStringify(largeObject, replacer);
jsonStringifyStream.pipe(fs.createWriteStream('output.json'));
Custom Space Argument
This feature demonstrates how to use the space argument to format the JSON output with indentation. In this example, the JSON output will be pretty-printed with an indentation of 2 spaces.
const JSONStreamStringify = require('json-stream-stringify');
const fs = require('fs');
const largeObject = { /* large object data */ };
const jsonStringifyStream = new JSONStreamStringify(largeObject, null, 2);
jsonStringifyStream.pipe(fs.createWriteStream('output.json'));
JSONStream is a package that provides streaming JSON parsing and stringifying. It is similar to json-stream-stringify in that it allows for memory-efficient handling of large JSON objects. However, JSONStream offers more flexibility with its ability to parse JSON streams in addition to stringifying them.
stream-json is another package that provides tools for working with JSON in a streaming fashion. It includes parsers, stringifiers, and utilities for processing JSON data in a memory-efficient way. Compared to json-stream-stringify, stream-json offers a more modular approach with separate components for different tasks.
oboe is a library for working with JSON in a streaming manner. It allows for both parsing and stringifying JSON data. Oboe is particularly useful for handling large JSON responses from HTTP requests. Compared to json-stream-stringify, oboe provides more features for working with JSON data in real-time.
JSON Stringify as a Readable Stream with rescursive resolving of any readable streams and Promises.
npm install --save json-stream-stringify
Convert value to JSON string. Returns a readable stream.
value
Any data to convert to JSON.replacer
Optional Function(key, value)
or Array
.const JSONStreamStreamify = require('json-stream-stringify');
JSONStreamStreamify({
aPromise: Promise.resolve(Promise.resolve("text")), // Promise may resolve more promises and streams which will be consumed and resolved
aStream: ReadableObjectStream({a:1}, 'str'), // Stream may write more streams and promises which will be consumed and resolved
arr: [1, 2, Promise.resolve(3), Promise.resolve([4, 5]), ReadableStream('a', 'b', 'c')],
date: new Date(2016, 0, 2)
}).pipe(process.stdout);
Output (each line represents a write from JSONStreamStreamify)
{
"aPromise":
"text"
"aStream":
[
{
"a":
1
}
,
"str"
]
"arr":
[
1
,
2
,
3
,
[
4
,
5
]
,
"
a
b
c
"
],
"date":
"2016-01-01T23:00:00.000Z"
}
app.get('/api/users', (req, res, next) => JSONStreamStreamify(Users.find().stream()).pipe(res));
Feel free to contribute.
Uses toJSON when available, and JSON.stringify to stringify everything but objects and arrays.
Streams with ObjectMode=true are output as arrays while ObjectMode=false output as a concatinated string (each chunk is piped with transforms).
Circular structures are handled using a WeakMap based implementation of Douglas Crockfords Decycle method. To restore circular structures; use Crockfords Retrocycle method on the parsed object.
NodeJS >4.2.2
Copyright (c) 2016 Faleij faleij@gmail.com
FAQs
JSON.Stringify as a readable stream
The npm package json-stream-stringify receives a total of 274,292 weekly downloads. As such, json-stream-stringify popularity was classified as popular.
We found that json-stream-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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