npm install jsonstreamify

Example:

obj = new ObjectStream()

arr = new ArrayStream()
arr.write(1)
arr.write('strings')
arr.write(true)
arr.write(undefined)
arr.end()

obj.write('nesting arrays in objects', arr)

obj.end()

obj.pipe(process.stdout)

// outputs `{"nesting arrays in objects":[1,"strings",true,null]}`

• ObjectStream
  • write(key, value)
  • end()
• ArrayStream
  • write(value)
  • end()

The constructors take no arguments.

##ObjectStream

###ObjectStream::write(key, value)

Adds a key/value pair to the object. The key will be stringified. Value types are discussed below.

Note: The stream will contain keys in the order they are written to the object.

###ObjectStream::end()

Declares that no more will be written. It is an error to call write after end. After end is called and all of the values resolve, the stream will end.

##ArrayStream

###ArrayStream::write(value)

Appends a value to the array. Arrays can only be written to in order. Value types are discussed below.

###ArrayStream::end()

Declares that no more will be written. It is an error to call write after end. After end is called and all of the values resolve, the stream will end.

##Values

###Streams

Instances of Readable will be consumed and the output toString'd and appropriately escaped. This will probably not do what you want if the data provided isn't Strings or Buffers.

Instances of ObjectStream and ArrayStream are an exception - they will not be toString'd or escaped, so nesting them will work as you'd expect.

###undefined

undefined doesn't exist in JSON, so we handle it the same way as JSON.stringify - it will be changed to null if in an array, and the key/value pair will be dropped if it is the value in an object.

###Everything Else

All other values will be JSON.stringify'd. That means that objects, strings, arrays, booleans, numbers, null, etc. will behave as expected.

##Buffering

Written streams will be left paused until it's time to pipe them out. This makes it safe to write in any order/timing without filling memory.