sendJson

Documentation for Redweb 0.13.2. Install that exact version when following these examples.

Utility to JSON.stringify data and send it over a ws socket.

Explain it like I’m five

sendJson is a careful packer: give it a JavaScript value and it turns that value into one JSON message before placing it on the socket.

When should I use it?

Use it for structured server-to-client messages instead of repeating JSON.stringify and transport checks throughout handlers.

Follow the example

This API pattern illustrates the named surface; it may require application-owned classes, credentials, or assets. Start from a complete recipe for a runnable application.

const { sendJson } = require('redweb')

sendJson(socket, { type: 'ping' })

1. Application code creates a normal object with a type and payload.
2. sendJson serializes it once using the route’s safe sending path.
3. The client receives one complete text frame and parses the matching JSON value.

Methods and members

sendJson(socket, data)

Serialises data and writes it to the socket.

What should I watch for?

Serialization can fail on cycles and BigInt values, and large objects still consume memory. Bound payload sizes and keep messages purpose-specific.