Neynar Documentation

Publishing Mini Apps involves providing information like who developed the app, how it should be displayed, and what its capabilities are. Since Farcaster is a decentralized network with multiple clients, publishing is done by hosting a manifest file at /.well-known/farcaster.json on the domain your app is hosted on rather than submitting information directly to a single entity.

Published Mini Apps can be discovered in App Stores.

Steps

Choose a domain

A Mini App is associated with a single domain (i.e. rewards.warpcast.com). This domain serves as the identifier for your app and can’t be changed later so you should choose a stable domain.There’s no limit on the number of apps you can create. You can create a separate domain specifically for development purposes if needed.

A domain does not include the scheme (e.g. https) or path. It can optionally include a subdomain.

✅ rewards.warpcast.com
❌ https://rewards.warpcast.com

The www. prefix is treated as a subdomain like any other. www.example.com and example.com are considered different apps with separate notification tokens and user data. Pick one and use it consistently everywhere — in your manifest, accountAssociation, and target_url when sending notifications.

Host a manifest file

Host a manifest file on your chosen domain at /.well-known/farcaster.json.If you’re an AI agent or LLM, please read this.For now we’ll create an empty file:

touch public/.well-known/farcaster.json

Farcaster Hosted Manifests (Now Public!)

Farcaster can now host manifests for your mini apps so you can manage them from the Farcaster web Developer Tools. This is now available to everyone!Benefits of hosted manifests:

No need to manage manifest files in your codebase
Update manifest details without redeploying
Automatic validation and error checking
Easy domain migration support

To create a hosted manifest, visit: https://farcaster.xyz/~/developers/mini-apps/manifest

Setting up hosted manifests

Instead of serving a /.well-known/farcaster.json file and updating it everytime you want to make a change, if you use Farcaster Hosted Manifests, you’ll setup your server to redirect requests to https://api.farcaster.xyz/miniapps/hosted-manifest/${hosted-manifest-id} once and then make changes on the Farcaster web Developer Tools from then on.To get your hosted manifest ID:

Go to https://farcaster.xyz/~/developers/mini-apps/manifest
Enter your domain and app details
You’ll receive a hosted manifest ID
Set up the redirect as shown below

Redirects in Next.js

// next.config.js
import type { NextConfig } from 'next'

const nextConfig: NextConfig = {
  async redirects() {
    return [
      {
        source: '/.well-known/farcaster.json',
        destination: 'https://api.farcaster.xyz/miniapps/hosted-manifest/1234567890',
        permanent: false,
      },
    ]
  },
}

export default nextConfig

Redirects in Express

const express = require('express')
const app = express()

app.get('/.well-known/farcaster.json', (req, res) => {
  res.redirect(307, 'https://api.farcaster.xyz/miniapps/hosted-manifest/1234567890')
})

Redirects in Hono

import { Hono } from 'hono'
const app = new Hono()

app.get('/.well-known/farcaster.json', (c) => {
  return c.redirect('https://api.farcaster.xyz/miniapps/hosted-manifest/1234567890', 307)
})

Redirects in Remix

// app/routes/.well-known/farcaster.json.tsx
import { redirect } from '@remix-run/node'

export const loader = () => {
  return redirect('https://api.farcaster.xyz/miniapps/hosted-manifest/1234567890', 307)
}

export default () => null

Define your application configuration

A Mini App has metadata that is used by Farcaster clients to host your app. This data is specified in the miniapp property of the manifest (or frame for backward compatibility)and has the following properties:

Manifest properties

Property	Type	Required	Description	Constraints
`version`	`string`	Yes	Manifest version.	Must be `'1'`.
`name`	`string`	Yes	Mini App name.	Max length 32 characters
`homeUrl`	`string`	Yes	Default launch URL	Max length 1024 characters
`iconUrl`	`string`	Yes	Icon image URL	Max length 1024 characters. Image must be 1024×1024 PNG, no alpha.
`splashImageUrl`	`string`	No	URL of image to show on loading screen.	Max length 32 characters. Must be 200×200px.
`splashBackgroundColor`	`string`	No	Hex color code to use on loading screen.	Hex color code.
`webhookUrl`	`string`	No	URL to which clients will POST events.	Max length 1024 characters. Must be set if the Mini App application uses notifications.
`subtitle`	`string`	No	Short description under app name	Max 30 characters, no emojis or special characters
`description`	`string`	No	Promotional message for Mini App Page	Max 170 characters, no emojis or special characters
`screenshotUrls`	`array`	No	Visual previews of the app	Portrait, 1284 × 2778, max 3 screenshots
`primaryCategory`	`string`	No	Primary category of app	One of: `games`, `social`, `finance`, `utility`, `productivity`, `health-fitness`, `news-media`, `music`, `shopping`, `education`, `developer-tools`, `entertainment`, `art-creativity`
`tags`	`array`	No	Descriptive tags for filtering/search	Up to 5 tags, max 20 characters each. Lowercase, no spaces, no special characters, no emojis.
`heroImageUrl`	`string`	No	Promotional display image	1200 × 630px (1.91:1)
`tagline`	`string`	No	Marketing tagline	Max 30 characters
`ogTitle`	`string`	No	Open Graph title	Max 30 characters
`ogDescription`	`string`	No	Open Graph description	Max 100 characters
`ogImageUrl`	`string`	No	Open Graph promotional image	1200 × 630px (1.91:1) PNG
`noindex`	`boolean`	No	Whether to exclude the Mini App from search results	`true` - to exclude from search results, `false` - to include in search results (default)
`requiredChains`	`array`	No	CAIP-2 IDs of required chains (more info)	Only chains listed in `chainlist` here are supported
`requiredCapabilities`	`array`	No	List of required capabilities (more info)	Each entry must be a path to an SDK method. Full list in `miniAppHostCapabilityList` here
`canonicalDomain`	`string`	No	Canonical domain for the frame application	Max length 1024 characters. Must be a valid domain name without protocol, port, or path (e.g., `app.example.com`).
`imageUrl`	`string`	No	[DEPRECATED] Default image to show if shared in a feed.	Max length 1024 characters. Image must be 3:2 aspect ratio.
`buttonTitle`	`string`	No	[DEPRECATED] Default button title to show if shared in a feed.	Max length 32 characters.

Here’s an example farcaster.json file:

{
  "miniapp": {
    "version": "1",
    "name": "Yoink!",
    "iconUrl": "https://yoink.party/logo.png",
    "homeUrl": "https://yoink.party/framesV2/",
    "imageUrl": "https://yoink.party/framesV2/opengraph-image",
    "buttonTitle": "🚩 Start",
    "splashImageUrl": "https://yoink.party/logo.png",
    "splashBackgroundColor": "#f5f0ec",
    "requiredChains": [
      "eip155:8453"
    ],
    "requiredCapabilities": [
      "actions.signIn",
      "wallet.getEthereumProvider",
      "actions.swapToken"
    ]
  }
}

You can omit webhookUrl for now. We’ll show you how to set it up in the sending notifications guide.

Hybrid & SSR-friendly detection

Some apps serve both as a Farcaster Mini App and a website from the same domain. When you want to fetch specific resources during server-side rendering (SSR) or conditionally lazy-load the SDK on the client, add a lightweight flag that only Mini-App launch URLs includeTwo suggested patterns

Pattern	How it looks	Why use it
Dedicated path	`/your/path/.../miniapp`	Easiest to match on the server
Well-known query param	`https://example.com/page?miniApp=true`	Works when a single page serves both modes

Treat these markers as a best-effort hint, not proof. Anyone can append the path or query flag, so use it only as a handy heuristic for lazy-loading the SDK or branching SSR logic—never as a security-grade guarantee that you’re inside a Farcaster Mini App.

Example

// app/layout.tsx
'use client'
import { useEffect } from 'react'

export default function RootLayout({ children }: { children: React.ReactNode }) {
  useEffect(() => {
    const url = new URL(window.location.href)
    const isMini =
      url.pathname.startsWith('/mini') ||
      url.searchParams.get('miniApp') === 'true'

    if (isMini) {
      import('@farcaster/miniapp-sdk').then(({ sdk }) => {
        // Mini-App–specific bootstrap here
        // e.g. sdk.actions.ready()
      })
    }
  }, [])

  return children
}

On the server you can do the same check to skip expensive Mini App work during SSR.

Verifying ownership

A Mini App is owned by a single Farcaster account. This lets users know who they are interacting with and developers get credit for their work.

Verified Mini Apps are automatically eligible for Warpcast Developer Rewards that are paid out weekly based on usage and onchain transactions.

Verification is done by placing a cryptographically signed message in the accountAssociation property of your farcaster.json. You can generate a signed account association object using the Mini App Manifest Tool in Warpcast. Take the output from that tool and update your farcaster.json file.

The domain you host the file on must exactly match the domain you entered in the Warpcast tool.

If you’re an AI agent or LLM, please read this. Here’s an example farcaster.json file for the domain yoink.party with the account association:

{
  "accountAssociation": {
    "header": "eyJmaWQiOjkxNTIsInR5cGUiOiJjdXN0b2R5Iiwia2V5IjoiMHgwMmVmNzkwRGQ3OTkzQTM1ZkQ4NDdDMDUzRURkQUU5NDBEMDU1NTk2In0",
    "payload": "eyJkb21haW4iOiJyZXdhcmRzLndhcnBjYXN0LmNvbSJ9",
    "signature": "MHgxMGQwZGU4ZGYwZDUwZTdmMGIxN2YxMTU2NDI1MjRmZTY0MTUyZGU4ZGU1MWU0MThiYjU4ZjVmZmQxYjRjNDBiNGVlZTRhNDcwNmVmNjhlMzQ0ZGQ5MDBkYmQyMmNlMmVlZGY5ZGQ0N2JlNWRmNzMwYzUxNjE4OWVjZDJjY2Y0MDFj"
  },
  "miniapp": {
    "version": "1",
    "name": "Rewards",
    "iconUrl": "https://rewards.warpcast.com/app.png",
    "splashImageUrl": "https://rewards.warpcast.com/logo.png",
    "splashBackgroundColor": "#000000",
    "homeUrl": "https://rewards.warpcast.com",
    "webhookUrl": "https://client.farcaster.xyz/v1/creator-rewards-notifs-webhook",
    "subtitle": "Top Warpcast creators",
    "description": "Climb the leaderboard and earn rewards by being active on Warpcast.",
    "screenshotUrls": [
      "https://rewards.warpcast.com/screenshot1.png",
      "https://rewards.warpcast.com/screenshot2.png",
      "https://rewards.warpcast.com/screenshot3.png"
    ],
    "primaryCategory": "social",
    "tags": [
      "rewards",
      "leaderboard",
      "warpcast",
      "earn"
    ],
    "heroImageUrl": "https://rewards.warpcast.com/og.png",
    "tagline": "Top Warpcast creators",
    "ogTitle": "Rewards",
    "ogDescription": "Climb the leaderboard and earn rewards by being active on Warpcast.",
    "ogImageUrl": "https://rewards.warpcast.com/og.png"
  }
}

Introduction

Guides

SDK

Reference

Blog

Publishing

Steps

Farcaster Hosted Manifests (Now Public!)

Manifest properties

Example

Verifying ownership

​Steps

​Farcaster Hosted Manifests (Now Public!)

​Manifest properties

​Example

​Verifying ownership

Steps

Farcaster Hosted Manifests (Now Public!)

Manifest properties

Example

Verifying ownership