Reference

The op field of every gateway payload, and which side sends it.

WebSocket close codes from the gateway, and whether reconnecting makes sense.

Intent bits for IDENTIFY, the events each one gates, and which are privileged.

Voice WebSocket opcodes, including the DAVE end-to-end encryption set.

Close codes from the voice WebSocket and what each one means.

Status codes the REST API returns and what they mean in Discord terms.

Every documented code in the error body, from 10003 Unknown Channel to 50013 Missing Permissions.

Rate limit headers, the global and invalid-request limits, and other hard caps.

Which REST and gateway versions are available, deprecated or gone.

Every permission bit with hex and decimal values, plus which channel types it applies to.

The type integer on channel objects, from GUILD_TEXT to GUILD_MEDIA.

Bits in the channel flags field: pinned threads, required tags and more.

The message type integer, and which system messages can be deleted.

Bits on message.flags: ephemeral, suppress embeds, voice messages, components v2.

Public user flag bits behind profile badges, plus premium_type values.

Documented strings in guild.features, and which ones you can toggle.

Bits on application.flags, including the intent approval flags.

action_type values for audit log entries and the object each one changes.

Every message and modal component type, including components v2 layout and content.

Incoming interaction types and the callback types you answer them with.

Mentions, emoji, timestamp styles, guild navigation links and markdown syntax.

Image paths on cdn.discordapp.com, supported formats and size rules.

How Discord ids are built, with a decoder for timestamps.

Character limits on every embed field and the 6000-character total.

Upload limits and long-standing perks by Nitro tier and server boost level.

Locale codes for user.locale, guild preferred_locale and command localizations.