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Debug WebSocket connections. Free online tool, no login, no sign-up.

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Usage Guide & Tech FAQ

Usage Guide

  1. Provide the WebSocket URL (and headers if needed).
  2. Connect, then send test messages.
  3. Observe replies and event logs to validate behavior.
  4. If it fails, check URL, network and CORS/policy.
  5. Prefer `wss://` on https pages—mixed content may block plain `ws://`.
  6. If the server requires `Sec-WebSocket-Protocol`, set it during the handshake.
  7. Agree on text vs binary frames and payload formats (JSON, MessagePack, etc.).
  8. Heartbeats and idle timeouts depend on the server and gateway—long idle may drop connections.
  9. STOMP/Socket.IO differ from raw WebSocket framing—read their ACK rules.
  10. Production gateways should enforce auth, timeouts, and rate limits—this tool is for connectivity checks.
  11. Read the title and description first to confirm this utility matches your task (avoid using the wrong tool and misinterpreting output).
  12. Paste or type input in the editor; if a sample/template is provided, load it first to learn the expected output shape.

Related Tech Knowledge

  • After a successful handshake, messages flow bidirectionally.
  • Services may require subprotocols or specific heartbeat behavior.
  • This tool uses the browser WebSocket API.
  • Disconnects are often related to network or server timeouts.
  • Masking and fragmentation are handled by the browser; you focus on message boundaries/types.
  • Reverse proxies must allow `Upgrade` and tune read timeouts for long-lived sockets.
  • Browsers limit concurrent connections and may throttle background tabs during stress tests.
  • Auth may occur in query/header during handshake or in the first message—avoid long-lived static tokens in URLs.
  • WebSocket upgrades are separate from HTTP/2 multiplexing semantics.
  • Certificate errors on `wss` fail at handshake time with sometimes cryptic errors.
  • Core parsing and computation run in your browser; by default your raw business payload is not persisted to this site’s servers (see on-page privacy notes).
  • The pipeline is typically: read input → parse (lexical/syntactic/structured) → transform → render; failures aim to be diagnosable.