Tools for developing Nostr clients.
Only depends on @scure and @noble packages.
This package is only providing lower-level functionality. If you want an easy-to-use fully-fledged solution that abstracts the hard parts of Nostr and makes decisions on your behalf, take a look at NDK and @snort/system.
npm install nostr-tools # or yarn add nostr-toolsIf using TypeScript, this package requires TypeScript >= 5.0.
import { generateSecretKey, getPublicKey } from 'nostr-tools'
let sk = generateSecretKey() // `sk` is a Uint8Array
let pk = getPublicKey(sk) // `pk` is a hex stringimport { finalizeEvent, verifyEvent } from 'nostr-tools'
let event = finalizeEvent({
kind: 1,
created_at: Math.floor(Date.now() / 1000),
tags: [],
content: 'hello',
}, sk)
let isGood = verifyEvent(event)import { Relay, finalizeEvent, generateSecretKey, getPublicKey } from 'nostr-tools'
const relay = await Relay.connect('wss://relay.example.com')
console.log(`connected to ${relay.url}`)
// let's query for an event that exists
const sub = relay.subscribe([
{
ids: ['d7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027'],
},
], {
onevent(event) {
console.log('we got the event we wanted:', event)
},
oneose() {
sub.close()
}
})
// let's publish a new event while simultaneously monitoring the relay for it
let sk = generateSecretKey()
let pk = getPublicKey(sk)
relay.sub([
{
kinds: [1],
authors: [pk],
},
], {
onevent(event) {
console.log('got event:', event)
}
})
let eventTemplate = {
kind: 1,
created_at: Math.floor(Date.now() / 1000),
tags: [],
content: 'hello world',
}
// this assigns the pubkey, calculates the event id and signs the event in a single step
const signedEvent = finalizeEvent(eventTemplate, sk)
await relay.publish(signedEvent)
relay.close()To use this on Node.js you first must install websocket-polyfill and import it:
import 'websocket-polyfill'import { SimplePool } from 'nostr-tools'
const pool = new SimplePool()
let relays = ['wss://relay.example.com', 'wss://relay.example2.com']
let h = pool.subscribeMany(
[...relays, 'wss://relay.example3.com'],
[
{
authors: ['32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245'],
},
],
{
onevent(event) {
// this will only be called once the first time the event is received
// ...
},
oneose() {
h.close()
}
}
)
await Promise.any(pool.publish(relays, newEvent))
console.log('published to at least one relay!')
let events = await pool.querySync(relays, [{ kinds: [0, 1] }])
let event = await pool.get(relays, {
ids: ['44e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245'],
})import { parseReferences } from 'nostr-tools'
let references = parseReferences(event)
let simpleAugmentedContent = event.content
for (let i = 0; i < references.length; i++) {
let { text, profile, event, address } = references[i]
let augmentedReference = profile
? `<strong>@${profilesCache[profile.pubkey].name}</strong>`
: event
? `<em>${eventsCache[event.id].content.slice(0, 5)}</em>`
: address
? `<a href="${text}">[link]</a>`
: text
simpleAugmentedContent.replaceAll(text, augmentedReference)
}import { nip05 } from 'nostr-tools'
let profile = await nip05.queryProfile('jb55.com')
console.log(profile.pubkey)
// prints: 32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245
console.log(profile.relays)
// prints: [wss://relay.damus.io]To use this on Node.js < v18, you first must install node-fetch@2 and call something like this:
nip05.useFetchImplementation(require('node-fetch'))import { nip19, generateSecretKey, getPublicKey } from 'nostr-tools'
let sk = generateSecretKey()
let nsec = nip19.nsecEncode(sk)
let { type, data } = nip19.decode(nsec)
assert(type === 'nsec')
assert(data === sk)
let pk = getPublicKey(generateSecretKey())
let npub = nip19.npubEncode(pk)
let { type, data } = nip19.decode(npub)
assert(type === 'npub')
assert(data === pk)
let pk = getPublicKey(generateSecretKey())
let relays = ['wss://relay.nostr.example.mydomain.example.com', 'wss://nostr.banana.com']
let nprofile = nip19.nprofileEncode({ pubkey: pk, relays })
let { type, data } = nip19.decode(nprofile)
assert(type === 'nprofile')
assert(data.pubkey === pk)
assert(data.relays.length === 2)Importing the entirety of nostr-tools may bloat your build, so you should probably import individual packages instead:
import { generateSecretKey, finalizeEvent, verifyEvent } from 'nostr-tools/pure'
import { SimplePool } from 'nostr-tools/pool'
import { Relay, Subscription } from 'nostr-tools/relay'
import { matchFilter } from 'nostr-tools/filter'
import { decode, nprofileEncode, neventEncode, npubEncode } from 'nostr-tools/nip19'
// and so on and so forthnostr-wasm is a thin wrapper over libsecp256k1 compiled to WASM just for hashing, signing and verifying Nostr events.
import { setNostrWasm, generateSecretKey, finalizeEvent, verifyEvent } from 'nostr-tools/wasm'
import { initNostrWasm } from 'nostr-wasm'
// make sure this promise resolves before your app starts calling finalizeEvent or verifyEvent
initNostrWasm().then(setNostrWasm)
// or use 'nostr-wasm/gzipped' or even 'nostr-wasm/headless',
// see https://www.npmjs.com/package/nostr-wasm for optionsIf you're going to use Relay and SimplePool you must also import nostr-tools/abstract-relay and/or nostr-tools/abstract-pool instead of the defaults and then instantiate them by passing the verifyEvent:
import { setNostrWasm, verifyEvent } from 'nostr-tools/wasm'
import { AbstractRelay } from 'nostr-tools/abstract-relay'
import { AbstractSimplePool } from 'nostr-tools/abstract-pool'
import { initNostrWasm } from 'nostr-wasm'
initNostrWasm().then(setNostrWasm)
const relay = AbstractRelay.connect('wss://relayable.org', { verifyEvent })
const pool = new AbstractSimplePool({ verifyEvent })This may be faster than the pure-JS noble libraries used by default and in nostr-tools/pure. Benchmarks:
benchmark time (avg) (min … max) p75 p99 p995
------------------------------------------------- -----------------------------
• relay read message and verify event (many events)
------------------------------------------------- -----------------------------
wasm 34.94 ms/iter (34.61 ms … 35.73 ms) 35.07 ms 35.73 ms 35.73 ms
pure js 239.7 ms/iter (235.41 ms … 243.69 ms) 240.51 ms 243.69 ms 243.69 ms
trusted 402.71 µs/iter (344.57 µs … 2.98 ms) 407.39 µs 745.62 µs 812.59 µs
summary for relay read message and verify event
wasm
86.77x slower than trusted
6.86x faster than pure js
<script src="https://unpkg.com/nostr-tools/lib/nostr.bundle.js"></script>
<script>
window.NostrTools.generateSecretKey('...') // and so on
</script>To develop nostr-tools, install just and run just -l to see commands available.
This is free and unencumbered software released into the public domain. By submitting patches to this project, you agree to dedicate any and all copyright interest in this software to the public domain.