YAML Validator

Tracking since Apr 1, 2026.

Changelog

• Jun 10, 2026
  description

  🔧 Validate YAML files against 11 official schemas with automatic detection. This browser-based validator helps you catch configuration errors before deployment with schema validation supporting Kubernetes, Docker Compose, and CI/CD pipelines.
  
  ✨ New in Version 1.2
  
  - Companion website at yamlvalidator.dev — validate online without installing anything
  - Open files from your computer, edit in-browser, and save when done
  - Share snippets via compressed URL — recipients open the link on yamlvalidator.dev
  
  📋 Supported Schemas
  
  Validate configurations online against official specifications:
  
  1️⃣ Kubernetes v1.29 - k8s manifest validator supporting Deployment, Service, Pod, ConfigMap, Ingress, StatefulSet, DaemonSet, CronJob and 50+ resource types
  2️⃣ Docker Compose v2.29 - container orchestration checker with full spec support
  3️⃣ GitHub Actions - workflow validator enabling CI/CD automation
  4️⃣ GitLab CI - pipeline checker supporting .gitlab-ci.yml configurations
  5️⃣ CircleCI - build configuration validator supporting config.yml files
  6️⃣ Azure Pipelines - devops workflow checker with full schema support
  7️⃣ Bitbucket Pipelines - pipeline configuration validator
  8️⃣ Ansible - playbook automation script checker
  9️⃣ Helm Charts - Chart.yaml package management validator
  🔟 OpenAPI 3.0 - REST API specification checker
  ⬛ Swagger 2.0 - API spec validator
  
  🎯 Smart Error Detection
  
  The validator automatically detects which schema applies to your content:
  
  ▸ Paste code and the matching schema is detected instantly
  ▸ Error line highlighting shows exact problem location
  ▸ Multi-document support with --- separators
  ▸ Schema mismatch suggestions with one-click fix
  
  📂 File Operations and Sharing
  
  Work with configuration files directly in your browser:
  
  • Open .yaml and .yml files from your computer for validation
  • Save and download edited files when done
  • Share snippets via compressed URL with your team
  • Drag and drop files onto the editor
  • Full-screen tab mode for editing larger configurations
  
  📂 GitHub Code Folding
  
  Browsing config files on GitHub? This extension adds a folding button:
  
  • Collapse and expand sections on any GitHub repository page
  • Navigate large configuration files with ease
  • Works with any .yaml or .yml file on GitHub
  • Toggle folding with a single click
  
  💡 Key Features
  
  ➤ Syntax checker providing instant feedback on your code
  ➤ Linter identifies structural and semantic issues early
  ➤ Formatter keeps code clean and readable
  ➤ Schema validation against official specifications
  ➤ Kubernetes manifest checker supporting k8s deployments
  ➤ Docker compose validator before running containers
  ➤ Open, edit, and save files from disk
  ➤ Share via URL with your team
  
  🚀 Built for DevOps Engineers
  
  Designed to help developers, sysadmins, and DevOps professionals:
  
  1. Kubernetes validation - check k8s manifests before kubectl apply
  2. Docker compose verification - catch config errors before docker compose up
  3. CI/CD pipeline validation - GitHub Actions, GitLab CI, CircleCI, Azure Pipelines
  4. API spec checking - OpenAPI and Swagger validation for REST APIs
  5. Infrastructure as Code - Ansible playbook and Helm chart support
  
  📝 How to Use
  
  - Click the extension icon in your browser toolbar
  - Paste code or click Open to load a file from disk
  - Schema is auto-detected or select manually from dropdown
  - Click Validate to check syntax and schema compliance
  - Click Share to copy a link and send to your team
  - Click Save to download the validated file
  
  🌐 Companion Website — yamlvalidator.dev
  
  Use the same validator online at yamlvalidator.dev:
  
  ◆ Validate YAML online without installing any extension
  ◆ Same 11 schemas with auto-detection
  ◆ Open, edit, and save files in your browser
  ◆ Share via compressed URL with your team
  ◆ Works on any browser — Chrome, Firefox, Safari, Edge
  ◆ Your data never leaves your machine
  
  🔍 Linting and Formatting
  
  Comprehensive code quality features included:
  
  ▪ Detect syntax errors instantly as you type
  ▪ Check structure against json schema specifications
  ▪ Format code to improve readability and consistency
  ▪ Verify configuration structure before deployment
  ▪ Multi-document parsing supporting complex configuration bundles
  
  ❓ Frequently Asked Questions
  
  Q: Does this extension work offline?
  A: Yes, after installation all validation happens locally in your browser.
  
  Q: Is my code sent to any server?
  A: No, your configuration remains completely private on your device.
  
  Q: What Kubernetes version is supported?
  A: Currently supports Kubernetes v1.29 with 50+ resource types.
  
  Q: Can I use it without installing the extension?
  A: Yes, visit yamlvalidator.dev to validate YAML online in any browser.
  
  ✅ Download this configuration file validator to check manifests, pipelines, and specs. Supports kubernetes validation, docker compose checking, and 11 schema types. Open, edit, share, and validate files directly in your browser.

  🔧 Validate YAML files against 11 official schemas with automatic detection. This browser-based validator helps you catch configuration errors before deployment with schema validation supporting Kubernetes, Docker Compose, and CI/CD pipelines.
  
  ✨ New — YAML Lint Warnings
  
  - Catches values that silently change type — the "Norway problem" where no, yes, on, and off are read as booleans
  - Flags leading-zero numbers, time-like values, and version strings that parse as the wrong type
  - Non-blocking warnings sit alongside the result, each linking to a guide that explains the trap with examples
  - Companion website at yamlvalidator.dev — validate and lint online without installing anything
  
  📋 Supported Schemas
  
  Validate configurations online against official specifications:
  
  1️⃣ Kubernetes v1.29 - k8s manifest validator supporting Deployment, Service, Pod, ConfigMap, Ingress, StatefulSet, DaemonSet, CronJob and 50+ resource types
  2️⃣ Docker Compose v2.29 - container orchestration checker with full spec support
  3️⃣ GitHub Actions - workflow validator enabling CI/CD automation
  4️⃣ GitLab CI - pipeline checker supporting .gitlab-ci.yml configurations
  5️⃣ CircleCI - build configuration validator supporting config.yml files
  6️⃣ Azure Pipelines - devops workflow checker with full schema support
  7️⃣ Bitbucket Pipelines - pipeline configuration validator
  8️⃣ Ansible - playbook automation script checker
  9️⃣ Helm Charts - Chart.yaml package management validator
  🔟 OpenAPI 3.0 - REST API specification checker
  ⬛ Swagger 2.0 - API spec validator
  
  🎯 Smart Error Detection
  
  The validator automatically detects which schema applies to your content:
  
  ▸ Paste code and the matching schema is detected instantly
  ▸ Error line highlighting shows exact problem location
  ▸ Lint warnings flag type-coercion traps that pass validation but break other tools
  ▸ Multi-document support with --- separators
  ▸ Schema mismatch suggestions with one-click fix
  
  📂 File Operations and Sharing
  
  Work with configuration files directly in your browser:
  
  • Open .yaml and .yml files from your computer for validation
  • Save and download edited files when done
  • Share snippets via compressed URL with your team
  • Drag and drop files onto the editor
  • Full-screen tab mode for editing larger configurations
  
  📂 GitHub Code Folding
  
  Browsing config files on GitHub? This extension adds a folding button:
  
  • Collapse and expand sections on any GitHub repository page
  • Navigate large configuration files with ease
  • Works with any .yaml or .yml file on GitHub
  • Toggle folding with a single click
  
  💡 Key Features
  
  ➤ Syntax checker providing instant feedback on your code
  ➤ Linter identifies structural and semantic issues early
  ➤ Formatter keeps code clean and readable
  ➤ Schema validation against official specifications
  ➤ Kubernetes manifest checker supporting k8s deployments
  ➤ Docker compose validator before running containers
  ➤ Open, edit, and save files from disk
  ➤ Share via URL with your team
  
  🚀 Built for DevOps Engineers
  
  Designed to help developers, sysadmins, and DevOps professionals:
  
  1. Kubernetes validation - check k8s manifests before kubectl apply
  2. Docker compose verification - catch config errors before docker compose up
  3. CI/CD pipeline validation - GitHub Actions, GitLab CI, CircleCI, Azure Pipelines
  4. API spec checking - OpenAPI and Swagger validation for REST APIs
  5. Infrastructure as Code - Ansible playbook and Helm chart support
  
  📝 How to Use
  
  - Click the extension icon in your browser toolbar
  - Paste code or click Open to load a file from disk
  - Schema is auto-detected or select manually from dropdown
  - Click Validate to check syntax and schema compliance
  - Click Share to copy a link and send to your team
  - Click Save to download the validated file
  
  🌐 Companion Website — yamlvalidator.dev
  
  Use the same validator online at yamlvalidator.dev:
  
  ◆ Validate YAML online without installing any extension
  ◆ Same 11 schemas with auto-detection
  ◆ Open, edit, and save files in your browser
  ◆ Share via compressed URL with your team
  ◆ Works on any browser — Chrome, Firefox, Safari, Edge
  ◆ Your data never leaves your machine
  
  🔍 Linting and Formatting
  
  Comprehensive code quality features included:
  
  ▪ Detect syntax errors instantly as you type
  ▪ Check structure against json schema specifications
  ▪ Format code to improve readability and consistency
  ▪ Verify configuration structure before deployment
  ▪ Multi-document parsing supporting complex configuration bundles
  
  ❓ Frequently Asked Questions
  
  Q: Does this extension work offline?
  A: Yes, after installation all validation happens locally in your browser.
  
  Q: Is my code sent to any server?
  A: No, your configuration remains completely private on your device.
  
  Q: What Kubernetes version is supported?
  A: Currently supports Kubernetes v1.29 with 50+ resource types.
  
  Q: Can I use it without installing the extension?
  A: Yes, visit yamlvalidator.dev to validate YAML online in any browser.
  
  ✅ Download this configuration file validator to check manifests, pipelines, and specs. Supports kubernetes validation, docker compose checking, and 11 schema types. Open, edit, share, and validate files directly in your browser.

• Jun 10, 2026
  short_description

  Validate YAML online with schema support for Kubernetes, Docker Compose, GitHub Actions. Open, edit, share YAML files.

  Validate and lint YAML online with schema support for Kubernetes, Docker Compose, GitHub Actions. Catch hidden type errors.

• Apr 1, 2026
  description

  🔧 Validate configuration files against 11 official schemas with automatic detection. This browser-based validator helps you catch errors before deployment with schema validation supporting Kubernetes, Docker Compose, and CI/CD pipelines.
  
  ✨ New in Version 1.1
  
  - Schema validation across 11 platforms with auto-detection
  - GitHub code folding to browse large config files
  - Open in Tab mode enabling full-screen editing
  - Dark mode support with system theme detection
  - Error line highlighting with click-to-jump navigation
  
  📋 Supported Schemas
  
  Validate configurations online against official specifications:
  
  1️⃣ Kubernetes v1.29 - k8s manifest validator supporting Deployment, Service, Pod, ConfigMap, Ingress, StatefulSet, DaemonSet, CronJob and 20+ resource types
  2️⃣ Docker Compose v2.29 - container orchestration checker with full spec support
  3️⃣ GitHub Actions - workflow validator enabling CI/CD automation
  4️⃣ GitLab CI - pipeline checker supporting .gitlab-ci.yml configurations
  5️⃣ CircleCI - build configuration validator supporting config.yml files
  6️⃣ Azure Pipelines - devops workflow checker with full schema support
  7️⃣ Bitbucket Pipelines - pipeline configuration validator
  8️⃣ Ansible - playbook automation script checker
  9️⃣ Helm Charts - Chart.yaml package management validator
  🔟 OpenAPI 3.0 - REST API specification checker
  ⬛ Swagger 2.0 - API spec validator
  
  🎯 Smart Error Detection
  
  The extension automatically detects which schema applies to your content:
  
  ▸ Paste code and the matching schema is detected instantly
  ▸ Error line highlighting shows exact problem location
  ▸ Multi-document support with --- separators
  ▸ Schema mismatch suggestions with one-click fix
  
  📂 GitHub Code Folding
  
  Browsing config files on GitHub? This extension adds a folding button:
  
  • Collapse and expand sections on any GitHub repository page
  • Navigate large configuration files with ease
  • Works with any .yaml or .yml file on GitHub
  • Toggle folding with a single click
  
  💡 Key Features
  
  ➤ Syntax checker providing instant feedback on your code
  ➤ Linter identifies structural and semantic issues early
  ➤ Formatter keeps code clean and readable
  ➤ Schema validation against official specifications
  ➤ Kubernetes manifest checker supporting k8s deployments
  ➤ Docker compose syntax validator before running containers
  
  🚀 Built to Support DevOps Engineers
  
  Designed to help developers, sysadmins, and DevOps professionals:
  
  1. Kubernetes validation - check k8s manifests before kubectl apply to prevent failures
  2. Docker compose verification - catch config errors before docker compose up
  3. CI/CD pipeline validation - GitHub Actions, GitLab CI, CircleCI, Azure Pipelines support
  4. API spec checking - OpenAPI and Swagger validation supporting REST APIs
  5. Infrastructure as Code - Ansible playbook and Helm chart configuration support
  
  📝 How to Use This Extension
  
  - Click the extension icon in your browser toolbar
  - Paste your code into the editor area
  - Schema is auto-detected or select manually from dropdown
  - Click Validate button to check syntax and schema compliance
  - Errors are highlighted with line numbers enabling quick navigation
  
  🌐 Browser-Based Configuration Validator Online
  
  Check configuration files directly in your browser with no external tools:
  
  ◆ Works completely offline after installation
  ◆ No data transmitted to external servers
  ◆ Your configuration code remains fully private
  ◆ Dark mode theme enabling comfortable editing sessions
  ◆ Open in Tab provides expanded workspace when editing larger files
  ◆ Persistent storage saves your work between sessions
  
  🔍 Linting and Formatting Capabilities
  
  Comprehensive code quality features included:
  
  ▪ Detect syntax errors instantly as you type
  ▪ Check structure against json schema specifications
  ▪ Format code to improve readability and consistency
  ▪ Verify configuration structure before deployment
  ▪ Multi-document parsing supporting complex configuration bundles
  
  ⚡ Cross-Platform Configuration Checking
  
  Supports configurations across multiple platforms and environments:
  
  • Kubernetes manifest validation supporting cloud-native apps and microservices
  • Docker compose checker enabling container orchestration
  • GitHub actions validator supporting continuous integration pipelines
  • Gitlab ci linter enabling automated build and deploy processes
  • Circleci config checking supporting cloud-based build automation
  • Ansible playbook validation enabling infrastructure automation
  
  ❓ Frequently Asked Questions
  
  Q: Does this extension work offline?
  A: Yes, after installation all validation happens locally in your browser.
  
  Q: Is my code sent to any server?
  A: No, your configuration remains completely private on your device.
  
  Q: What Kubernetes version is supported?
  A: Currently supports Kubernetes v1.29 with 23 resource types.
  
  ✅ Download this configuration file checker to validate manifests, pipelines, and specs. Supports kubernetes validation, docker compose checking, and 11 schema types with instant error detection.

  🔧 Validate YAML files against 11 official schemas with automatic detection. This browser-based validator helps you catch configuration errors before deployment with schema validation supporting Kubernetes, Docker Compose, and CI/CD pipelines.
  
  ✨ New in Version 1.2
  
  - Companion website at yamlvalidator.dev — validate online without installing anything
  - Open files from your computer, edit in-browser, and save when done
  - Share snippets via compressed URL — recipients open the link on yamlvalidator.dev
  
  📋 Supported Schemas
  
  Validate configurations online against official specifications:
  
  1️⃣ Kubernetes v1.29 - k8s manifest validator supporting Deployment, Service, Pod, ConfigMap, Ingress, StatefulSet, DaemonSet, CronJob and 50+ resource types
  2️⃣ Docker Compose v2.29 - container orchestration checker with full spec support
  3️⃣ GitHub Actions - workflow validator enabling CI/CD automation
  4️⃣ GitLab CI - pipeline checker supporting .gitlab-ci.yml configurations
  5️⃣ CircleCI - build configuration validator supporting config.yml files
  6️⃣ Azure Pipelines - devops workflow checker with full schema support
  7️⃣ Bitbucket Pipelines - pipeline configuration validator
  8️⃣ Ansible - playbook automation script checker
  9️⃣ Helm Charts - Chart.yaml package management validator
  🔟 OpenAPI 3.0 - REST API specification checker
  ⬛ Swagger 2.0 - API spec validator
  
  🎯 Smart Error Detection
  
  The validator automatically detects which schema applies to your content:
  
  ▸ Paste code and the matching schema is detected instantly
  ▸ Error line highlighting shows exact problem location
  ▸ Multi-document support with --- separators
  ▸ Schema mismatch suggestions with one-click fix
  
  📂 File Operations and Sharing
  
  Work with configuration files directly in your browser:
  
  • Open .yaml and .yml files from your computer for validation
  • Save and download edited files when done
  • Share snippets via compressed URL with your team
  • Drag and drop files onto the editor
  • Full-screen tab mode for editing larger configurations
  
  📂 GitHub Code Folding
  
  Browsing config files on GitHub? This extension adds a folding button:
  
  • Collapse and expand sections on any GitHub repository page
  • Navigate large configuration files with ease
  • Works with any .yaml or .yml file on GitHub
  • Toggle folding with a single click
  
  💡 Key Features
  
  ➤ Syntax checker providing instant feedback on your code
  ➤ Linter identifies structural and semantic issues early
  ➤ Formatter keeps code clean and readable
  ➤ Schema validation against official specifications
  ➤ Kubernetes manifest checker supporting k8s deployments
  ➤ Docker compose validator before running containers
  ➤ Open, edit, and save files from disk
  ➤ Share via URL with your team
  
  🚀 Built for DevOps Engineers
  
  Designed to help developers, sysadmins, and DevOps professionals:
  
  1. Kubernetes validation - check k8s manifests before kubectl apply
  2. Docker compose verification - catch config errors before docker compose up
  3. CI/CD pipeline validation - GitHub Actions, GitLab CI, CircleCI, Azure Pipelines
  4. API spec checking - OpenAPI and Swagger validation for REST APIs
  5. Infrastructure as Code - Ansible playbook and Helm chart support
  
  📝 How to Use
  
  - Click the extension icon in your browser toolbar
  - Paste code or click Open to load a file from disk
  - Schema is auto-detected or select manually from dropdown
  - Click Validate to check syntax and schema compliance
  - Click Share to copy a link and send to your team
  - Click Save to download the validated file
  
  🌐 Companion Website — yamlvalidator.dev
  
  Use the same validator online at yamlvalidator.dev:
  
  ◆ Validate YAML online without installing any extension
  ◆ Same 11 schemas with auto-detection
  ◆ Open, edit, and save files in your browser
  ◆ Share via compressed URL with your team
  ◆ Works on any browser — Chrome, Firefox, Safari, Edge
  ◆ Your data never leaves your machine
  
  🔍 Linting and Formatting
  
  Comprehensive code quality features included:
  
  ▪ Detect syntax errors instantly as you type
  ▪ Check structure against json schema specifications
  ▪ Format code to improve readability and consistency
  ▪ Verify configuration structure before deployment
  ▪ Multi-document parsing supporting complex configuration bundles
  
  ❓ Frequently Asked Questions
  
  Q: Does this extension work offline?
  A: Yes, after installation all validation happens locally in your browser.
  
  Q: Is my code sent to any server?
  A: No, your configuration remains completely private on your device.
  
  Q: What Kubernetes version is supported?
  A: Currently supports Kubernetes v1.29 with 50+ resource types.
  
  Q: Can I use it without installing the extension?
  A: Yes, visit yamlvalidator.dev to validate YAML online in any browser.
  
  ✅ Download this configuration file validator to check manifests, pipelines, and specs. Supports kubernetes validation, docker compose checking, and 11 schema types. Open, edit, share, and validate files directly in your browser.

• Apr 1, 2026
  short_description

  Validate yaml online with schema support for Kubernetes, Docker Compose, GitHub Actions. Linter and formatter in one tool.

  Validate YAML online with schema support for Kubernetes, Docker Compose, GitHub Actions. Open, edit, share YAML files.

Permissions & access

Permissions

storage

Host access

None declared

Screenshots

Similar extensions

Alternatives to YAML Validator, ranked by description similarity.

SQL Formatter

Format and beautify SQL queries with support for multiple SQL dialects

35

JSON Formatter Pro

Auto-format and validate JSON & API responses instantly. Syntax highlighting, tree view, dark mode. Data never leaves your browser.

3.0K

★ 4.8

DevToys New Tab

DevToys New Tab: 80+ developer utilities — JSON, Base64, hash, UUID, JWT, formatters, converters, network & image tools. Offline.

120

★ 5.0

Live Schema Validator

Detect and validate JSON-LD schema markup directly from webpages.

66

★ 5.0

Schema Markup Validator & Generator

Instantly validate, visualize, and generate Schema.org structured data for any webpage

627

★ 5.0

JSON Formatter

Format, validate, minify, and copy JSON locally with fast ShiftShift command-palette access in Chrome.

55

Json Formatter Online​

Handy Json Formatter Online for Chrome. Use a json viewer and json formatter for quick data formatting and viewing!

90

★ 4.6

Schema Architect

Professional JSON-LD schema generator for SEO professionals. Build, validate, and deploy structured data.

1