tinacms

name	tinacms
description	Build content-heavy sites with Git-backed TinaCMS. Provides visual editing for blogs, documentation, and marketing sites. Supports Next.js, Vite+React, and Astro with TinaCloud or Node.js self-hosting. Prevents 10 documented errors. Use when setting up CMS with non-technical editors or troubleshooting ESbuild compilation, module resolution, package manager compatibility, edge runtime limitations, or media upload timeouts.
user-invocable	true
allowed-tools	["Read","Write","Edit","Bash","Glob","Grep"]

TinaCMS

Git-backed headless CMS with visual editing for content-heavy sites.

Last Updated: 2026-01-21 Versions: tinacms@3.3.1, @tinacms/cli@2.1.1

---

Quick Start

Package Manager Recommendation:

• Recommended: pnpm (required for TinaCMS >2.7.3)
• Alternative: npm or yarn (may have module resolution issues in newer versions)

# Install pnpm (if needed)
npm install -g pnpm

# Initialize TinaCMS
npx @tinacms/cli@latest init

# Install dependencies with pnpm
pnpm install

# Update package.json scripts
{
  "dev": "tinacms dev -c \"next dev\"",
  "build": "tinacms build && next build"
}

# Set environment variables
NEXT_PUBLIC_TINA_CLIENT_ID=your_client_id
TINA_TOKEN=your_read_only_token

# Start dev server
pnpm run dev

# Access admin interface
http://localhost:3000/admin/index.html

Version Locking (Recommended):

Pin exact versions to prevent breaking changes from automatic CLI/UI updates:

{
  "dependencies": {
    "tinacms": "3.3.1",  // NOT "^3.3.1"
    "@tinacms/cli": "2.1.1"
  }
}

Why: TinaCMS UI assets are served from CDN and may update before your local CLI, causing incompatibilities.

Source: GitHub Issue #5838

---

Next.js Integration

useTina Hook (enables visual editing):

import { useTina } from 'tinacms/dist/react'
import { client } from '../../tina/__generated__/client'

export default function BlogPost(props) {
  const { data } = useTina({
    query: props.query,
    variables: props.variables,
    data: props.data
  })

  return <article><h1>{data.post.title}</h1></article>
}

export async function getStaticProps({ params }) {
  const response = await client.queries.post({
    relativePath: `${params.slug}.md`
  })

  return {
    props: {
      data: response.data,
      query: response.query,
      variables: response.variables
    }
  }
}

App Router: Admin route at app/admin/[[...index]]/page.tsx Pages Router: Admin route at pages/admin/[[...index]].tsx

---

Schema Configuration

tina/config.ts structure:

import { defineConfig } from 'tinacms'

export default defineConfig({
  branch: process.env.GITHUB_BRANCH || 'main',
  clientId: process.env.NEXT_PUBLIC_TINA_CLIENT_ID,
  token: process.env.TINA_TOKEN,
  build: {
    outputFolder: 'admin',
    publicFolder: 'public',
  },
  schema: {
    collections: [/* ... */],
  },
})

Collection Example (Blog Post):

{
  name: 'post',           // Alphanumeric + underscores only
  label: 'Blog Posts',
  path: 'content/posts',  // No trailing slash
  format: 'mdx',
  fields: [
    {
      type: 'string',
      name: 'title',
      label: 'Title',
      isTitle: true,
      required: true
    },
    {
      type: 'rich-text',
      name: 'body',
      label: 'Body',
      isBody: true
    }
  ]
}

Field Types: string, rich-text, number, datetime, boolean, image, reference, object

Reference Field Note: When a reference field references multiple collection types with shared field names, ensure the field types match. Conflicting types (e.g., bio: string vs bio: rich-text) cause GraphQL schema errors.

// Example: Reference field referencing multiple collections
{
  type: 'reference',
  name: 'contributor',
  collections: ['author', 'editor']  // Ensure shared fields have same type
}

Source: Community-sourced

---

Common Errors & Solutions

1. ❌ ESbuild Compilation Errors

Error Message:

ERROR: Schema Not Successfully Built
ERROR: Config Not Successfully Executed

Causes:

• Importing code with custom loaders (webpack, babel plugins, esbuild loaders)
• Importing frontend-only code (uses window, DOM APIs, React hooks)
• Importing entire component libraries instead of specific modules

Solution:

Import only what you need:

// ❌ Bad - Imports entire component directory
import { HeroComponent } from '../components/'

// ✅ Good - Import specific file
import { HeroComponent } from '../components/blocks/hero'

Prevention Tips:

• Keep tina/config.ts imports minimal
• Only import type definitions and simple utilities
• Avoid importing UI components directly
• Create separate .schema.ts files if needed

Reference: See references/common-errors.md#esbuild

---

2. ❌ Module Resolution: "Could not resolve 'tinacms'"

Error Message:

Error: Could not resolve "tinacms"

Causes:

• Corrupted or incomplete installation
• Version mismatch between dependencies
• Missing peer dependencies

Solution:

# Clear cache and reinstall
rm -rf node_modules package-lock.json
npm install

# Or with pnpm
rm -rf node_modules pnpm-lock.yaml
pnpm install

# Or with yarn
rm -rf node_modules yarn.lock
yarn install

Prevention:

• Use lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock)
• Don't use --no-optional or --omit=optional flags
• Ensure react and react-dom are installed (even for non-React frameworks)

---

3. ❌ Field Naming Constraints

Error Message:

Field name contains invalid characters

Cause:

• TinaCMS field names can only contain: letters, numbers, underscores
• Hyphens, spaces, special characters are NOT allowed

Solution:

// ❌ Bad - Uses hyphens
{
  name: 'hero-image',
  label: 'Hero Image',
  type: 'image'
}

// ❌ Bad - Uses spaces
{
  name: 'hero image',
  label: 'Hero Image',
  type: 'image'
}

// ✅ Good - Uses underscores
{
  name: 'hero_image',
  label: 'Hero Image',
  type: 'image'
}

// ✅ Good - CamelCase also works
{
  name: 'heroImage',
  label: 'Hero Image',
  type: 'image'
}

Note: This is a breaking change from Forestry.io migration

---

4. ❌ Docker Binding Issues

Error:

• TinaCMS admin not accessible from outside Docker container

Cause:

• TinaCMS binds to 127.0.0.1 (localhost only) by default
• Docker containers need 0.0.0.0 binding to accept external connections

Solution:

# Ensure framework dev server listens on all interfaces
tinacms dev -c "next dev --hostname 0.0.0.0"
tinacms dev -c "vite --host 0.0.0.0"
tinacms dev -c "astro dev --host 0.0.0.0"

Docker Compose Example:

services:
  app:
    build: .
    ports:
      - "3000:3000"
    command: npm run dev  # Which runs: tinacms dev -c "next dev --hostname 0.0.0.0"

---

5. ❌ Missing _template Key Error

Error Message:

GetCollection failed: Unable to fetch
template name was not provided

Cause:

• Collection uses templates array (multiple schemas)
• Document missing _template field in frontmatter
• Migrating from templates to fields and documents not updated

Solution:

Option 1: Use fields instead (recommended for single template)

{
  name: 'post',
  path: 'content/posts',
  fields: [/* ... */]  // No _template needed
}

Option 2: Ensure _template exists in frontmatter

---
_template: article  # ← Required when using templates array
title: My Post
---

Migration Script (if converting from templates to fields):

# Remove _template from all files in content/posts/
find content/posts -name "*.md" -exec sed -i '/_template:/d' {} +

---

6. ❌ Path Mismatch Issues

Error:

• Files not appearing in Tina admin
• "File not found" errors when saving
• GraphQL queries return empty results

Cause:

• path in collection config doesn't match actual file directory
• Relative vs absolute path confusion
• Trailing slash issues

Solution:

// Files located at: content/posts/hello.md

// ✅ Correct
{
  name: 'post',
  path: 'content/posts',  // Matches file location
  fields: [/* ... */]
}

// ❌ Wrong - Missing 'content/'
{
  name: 'post',
  path: 'posts',  // Files won't be found
  fields: [/* ... */]
}

// ❌ Wrong - Trailing slash
{
  name: 'post',
  path: 'content/posts/',  // May cause issues
  fields: [/* ... */]
}

Debugging:

1. Run npx @tinacms/cli@latest audit to check paths
2. Verify files exist in specified directory
3. Check file extensions match format field

---

7. ❌ Build Script Ordering Problems

Error Message:

ERROR: Cannot find module '../tina/__generated__/client'
ERROR: Property 'queries' does not exist on type '{}'

Cause:

• Framework build running before tinacms build
• Tina types not generated before TypeScript compilation
• CI/CD pipeline incorrect order

Solution:

{
  "scripts": {
    "build": "tinacms build && next build"  // ✅ Tina FIRST
    // NOT: "build": "next build && tinacms build"  // ❌ Wrong order
  }
}

CI/CD Example (GitHub Actions):

- name: Build
  run: |
    npx @tinacms/cli@latest build  # Generate types first
    npm run build                   # Then build framework

Why This Matters:

• tinacms build generates TypeScript types in tina/__generated__/
• Framework build needs these types to compile successfully
• Running in wrong order causes type errors

---

8. ❌ Failed Loading TinaCMS Assets

Error Message:

Failed to load resource: net::ERR_CONNECTION_REFUSED
http://localhost:4001/...

Causes:

• Pushed development admin/index.html to production (loads assets from localhost)
• Site served on subdirectory but basePath not configured

Solution:

For Production Deploys:

{
  "scripts": {
    "build": "tinacms build && next build"  // ✅ Always build
    // NOT: "build": "tinacms dev"          // ❌ Never dev in production
  }
}

For Subdirectory Deployments:

⚠️ Sub-path Deployment Limitation: TinaCMS has known issues loading assets correctly when deployed to a sub-path (e.g., example.com/cms/admin instead of example.com/admin). This is a limitation even with basePath configuration.

Workaround: Deploy TinaCMS admin at root path (/admin) or use reverse proxy rewrite rules.

Source: Community-sourced

// tina/config.ts
export default defineConfig({
  build: {
    outputFolder: 'admin',
    publicFolder: 'public',
    basePath: 'your-subdirectory'  // ← May have asset loading issues on sub-paths
  }
})

CI/CD Fix:

# GitHub Actions / Vercel / Netlify
- run: npx @tinacms/cli@latest build  # Always use build, not dev

---

9. ❌ Reference Field 503 Service Unavailable

Error:

• Reference field dropdown times out with 503 error
• Admin interface becomes unresponsive when loading reference field

Cause:

• Too many items in referenced collection (100s or 1000s)
• No pagination support for reference fields currently

Solutions:

Option 1: Split collections

// Instead of one huge "authors" collection
// Split by active status or alphabetically

{
  name: 'active_author',
  label: 'Active Authors',
  path: 'content/authors/active',
  fields: [/* ... */]
}

{
  name: 'archived_author',
  label: 'Archived Authors',
  path: 'content/authors/archived',
  fields: [/* ... */]
}

Option 2: Use string field with validation

// Instead of reference
{
  type: 'string',
  name: 'authorId',
  label: 'Author ID',
  ui: {
    component: 'select',
    options: ['author-1', 'author-2', 'author-3']  // Curated list
  }
}

Option 3: Custom field component (advanced)

• Implement pagination in custom component
• See TinaCMS docs: https://tina.io/docs/extending-tina/custom-field-components/

---

10. ❌ Media Manager Upload Timeouts (Ghost Uploads)

Error Message:

Upload failed
Error uploading image

Cause:

• Media Manager shows error but image uploads successfully in background
• UI timeout doesn't reflect actual upload status
• Similar issue occurs with deletion (error shown but deletion succeeds)

Solution:

If upload shows error:

1. Wait 5-10 seconds
2. Close and reopen Media Manager
3. Check if image already uploaded before retrying
4. Avoid duplicate upload attempts

Status: Known issue (high priority) Source: GitHub Issue #6325

---

Deployment Options

TinaCloud (Managed) - Recommended

Setup:

1. Sign up at https://app.tina.io
2. Get Client ID and Read Only Token
3. Set env vars: NEXT_PUBLIC_TINA_CLIENT_ID, TINA_TOKEN
4. Deploy to Vercel/Netlify/Cloudflare Pages

Pros: Zero config, free tier (10k requests/month)

---

Self-Hosted on Node.js

⚠️ Edge Runtime Limitation: Self-hosted TinaCMS does NOT work in Edge Runtime environments (Cloudflare Workers, Vercel Edge Functions) due to Node.js dependencies in @tinacms/datalayer and @tinacms/graphql. Use TinaCloud (managed service) for edge deployments.

Source: GitHub Issue #4363 (labeled "wontfix")

⚠️ Self-Hosted Examples May Be Outdated: Official self-hosted examples in the TinaCMS repository are acknowledged by the team as "quite out of date". Always cross-reference with latest documentation instead of relying solely on example repos.

Source: GitHub Issue #6365

For Node.js environments only (not edge runtime):

pnpm install @tinacms/datalayer tinacms-authjs
npx @tinacms/cli@latest init backend

Example (Node.js server, not Workers):

import { TinaNodeBackend, LocalBackendAuthProvider } from '@tinacms/datalayer'
import { AuthJsBackendAuthProvider, TinaAuthJSOptions } from 'tinacms-authjs'
import databaseClient from '../../tina/__generated__/databaseClient'

const isLocal = process.env.TINA_PUBLIC_IS_LOCAL === 'true'

// This ONLY works in Node.js runtime, NOT edge runtime
const handler = TinaNodeBackend({
  authProvider: isLocal
    ? LocalBackendAuthProvider()
    : AuthJsBackendAuthProvider({
        authOptions: TinaAuthJSOptions({
          databaseClient,
          secret: process.env.NEXTAUTH_SECRET,
        }),
      }),
  databaseClient,
})

Pros: Full control, self-hosted Cons: Requires Node.js runtime (cannot use edge computing)