SSE Utils

This is a small package that aims to be the server sent events equivalent of the JSON built-in module. It allows you to stringify an SSE object so it can be put on the wire. It allows you parse a stringified SSE object (you'll normally use another library to create an SSE client, but this can be helpfull for testing purposes).

Installation

npm install sse-utils

Examples

Individual Messages

let sse = require('sse-utils');

let input = {data: {foo: 'bar'}};
let sseString = sse.stringify(input);
console.log(sseString);
let output = sse.parse(sseString);
console.log(output);

Multiple Messages

let sse = require('sse-utils');

let input = [{data: {foo: 'bar'}}, {data: {bar: 'baz'}}];
let sseString = sse.stringifyAll(input);
console.log(sseString);

let output = sse.parseAll(sseString);
console.log(sseString);

TODO

• Add support for asynchronous (de)serializers

API

Table of Contents

• SSEObject
• Serializer
• Deserializer
• stringify
• stringifyAll
• parse
• parseAll

SSEObject

Type: object

Properties

• data any The payload of the message
• id string? The ID of the message (for reconnection)
• event string? The type of event being sent

Serializer

Custom serialization function

Type: function

Parameters

• payload any

Returns string

Deserializer

Custom deserialization function

Type: function

Parameters

• data string

Returns any

stringify

Stringify the data to an SSE message

Parameters

• payload SSEObject The payload of the sse message: contains data, id?, event?

• serializer Serializer? A specialized function that marshals the data into a string (optional)

• Throws TypeError Arguments should have their correct types

Returns string The data as an SSE message

stringifyAll

Stringify an array of data to SSE messages

Parameters

• payload array<SSEObject> An array of SSEObjects to be serialized

• serializer Serializer? A specialized function that marshals the data into a string (optional)

• Throws TypeError Arguments should have their correct types

Returns string The data is a single SSE message string

parse

Parse an SSE message and return the data

Parameters

• sseObject string The SSE message to parse

• deserializer Deserializer? A specialized function to reconstruct the payload

• Throws TypeError sseObject should be a string including the terminating newlines

Returns SSEObject The data sent in this SSE message

parseAll

Parse multiple SSE messages and return an array of SSEObjects

Parameters

• sseObjects string The SSE messages to parse

• deserializer Deserializer? A specialized function to reconstruct the payload

• Throws TypeError sseObjects should be a string including terminating newlines

Returns array<SSEObject> An array with the data sent in the messages