nips/25.md

NIP-25

Reactions

draft optional

A reaction is a kind 7 event that is used to indicate user reactions to other events. A reaction's content field MUST include a single character indicating the value of the reaction. Reactions MUST NOT be used to support application-level semantics, they are for user-generated content only.

A reaction with content set to + or an empty string MUST be interpreted as a "like" or "upvote". A reaction with content set to - MUST be interpreted as a "dislike" or "downvote".

A reaction with content set to an emoji or NIP-30 custom emoji SHOULD NOT be interpreted as a "like" or "dislike". Clients MAY instead display this emoji reaction on the post.

Tags

The reaction event SHOULD include e and p tags from the note the user is reacting to (and optionally a tags if the target is a replaceable event). This allows users to be notified of reactions to posts they were mentioned in. Including the e tags enables clients to pull all the reactions associated with individual posts or all the posts in a thread. a tags enables clients to seek reactions for all versions of a replaceable event.

The last e tag MUST be the id of the note that is being reacted to.

The last p tag MUST be the pubkey of the event being reacted to.

The a tag MUST contain the coordinates (kind:pubkey:d-tag) of the replaceable being reacted to.

The reaction event SHOULD include a k tag with the stringified kind number of the reacted event as its value, and a c tag with the reaction's content so that reactions can be indexed and filtered.

Example code

func make_like_event(pubkey: String, privkey: String, liked: NostrEvent) -> NostrEvent {
    var tags: [[String]] = liked.tags.filter {
    	tag in tag.count >= 2 && (tag[0] == "e" || tag[0] == "p")
    }
    tags.append(["e", liked.id])
    tags.append(["p", liked.pubkey])
    tags.append(["k", liked.kind])
    let ev = NostrEvent(content: "+", pubkey: pubkey, kind: 7, tags: tags)
    ev.calculate_id()
    ev.sign(privkey: privkey)
    return ev
}

Reactions to a website

If the target of the reaction is a website, the reaction MUST be a kind 17 event and MUST include an r tag with the website's URL.

{
  "kind": 17,
  "content": "⭐",
  "tags": [
    ["r", "https://example.com/"]
  ],
  // other fields...
}

URLs SHOULD be normalized, so that reactions to the same website are not omitted from queries. A fragment MAY be attached to the URL, to react to a section of the page. It should be noted that a URL with a fragment is not considered to be the same URL as the original.

Custom Emoji Reaction

The client may specify a custom emoji (NIP-30) :shortcode: in the reaction content. The client should refer to the emoji tag and render the content as an emoji if shortcode is specified.

{
  "kind": 7,
  "content": ":soapbox:",
  "tags": [
    ["emoji", "soapbox", "https://gleasonator.com/emoji/Gleasonator/soapbox.png"]
  ],
  // other fields...
}

The content can be set only one :shortcode:. And emoji tag should be one.