Schema.dev

Schema.dev is a free toolkit for generating, validating, and testing structured data. It is best suited to SEO professionals and site teams managing schema across many pages or environments. Its main advantage is the combination of a guided builder and scalable validation; deployment remains an unfinished part of the product.

Overview

Schema.dev brings creation and checking into one workflow. Its point-and-click wizard guides users through producing formatted JSON-LD for webpages, which can be copied into a page or passed to the Schema deployer. Text transformations and custom text for any field make the generated markup adaptable when the wizard’s defaults do not match a page.

The builder advertises support for more than 40 schema types and aims to cover every type supported by Google. That breadth makes it useful for varied content, although the stated goal does not establish that every Google-supported type is already present. Schema.dev is a product of seoClarity Labs, which says it has helped SEO professionals since 2008.

Key features

Guided schema creation

The wizard gives users a structured way to create JSON-LD without writing the whole object manually. Formatted output is ready to copy into webpages, and bulk generation makes the tool more practical for teams handling repeated page work than for a single one-off snippet. WordPress support is also provided.

Validation and testing

The tester validates Schema.org-supported structured data through a user interface and an optional API endpoint. API checks report errors, warnings, and recommended elements, giving teams more than a binary pass or fail. Support for testing at scale in both pre-production and production environments suits organizations that need checks in a release process or across live properties.

Deployment and integrations

Deployment is described through an existing tag manager or DNS, but the deployer is labeled coming soon. Cloudflare-managed DNS integration is also coming soon. Consequently, the current product is strongest for generating and validating markup; it should not be chosen as a present-day deployment platform.

Support and access

The Schema Builder is available as a Chrome extension, while the broader product is offered through web and API access. A help center supplies a knowledge base and a community contact option.

Pricing

Schema.dev uses a free model, with no paid tier stated.

The free tester is a sensible fit for teams that need interface-based checks or can use the optional API for larger volumes. The free extension suits people who prefer building in Chrome. No seat counts, usage quotas, trial period, or renewal terms are stated, so buyers should not assume enterprise limits or service commitments beyond the published free offer.

Platforms

Schema.dev supports web, API, and extension access. The Chrome extension delivers the builder in the browser, while API access enables automated or larger-scale validation. WordPress support broadens its usefulness for site owners working in that ecosystem.

Who it's for

Choose Schema.dev if you need a no-cost way to generate JSON-LD, customize fields, and validate implementations before and after release. SEO teams and developers maintaining many pages benefit most from bulk generation and testing across pre-production and production. It is less suitable for organizations whose primary requirement is immediate tag-manager or DNS deployment, because those capabilities are still marked coming soon.

Pros and cons

Pros

• Free creation and testing: both the UI tester and Chrome builder are priced at $0.
• Broad stated coverage: the builder advertises more than 40 schema types and targets Google-supported types.
• Flexible output: custom field text and transformations reduce the need to edit generated JSON-LD manually.
• Scale-aware validation: UI and optional API testing cover pre-production and production use, with feedback on errors, warnings, and recommendations.
• Bulk generation and WordPress support: useful for teams managing repeated page templates and WordPress sites.

Cons

• Deployment is not ready: the deployer and Cloudflare DNS integration are both coming soon.
• Coverage is an aspiration as well as a claim: the goal of supporting every Google schema type does not confirm universal current coverage.

Alternatives

For a generator with a free tier, a trial, and rolling schema for one domain and five pages, choose Baseline Labs Schema Generator; its Standard plan costs €79 a month.

EasySchema is a free web-based generator and SEO toolkit with no plan limits stated.

Choose JSON Schema App SaaS Schema if a basic free plan covering Product, Service, and Articles, up to 50 URLs, and an LLMs.txt generator fits your scope.

JSON-LD Generator is a free web tool advertising 17 schema types and no signup stated.

Choose Rolling Schema for a free one-domain plan with 500 credits per month and five rolling-schema pages; its free plan has no API access.

Schema.biz is a free web option with all tools, no premium tiers, no feature gates, no limits, and no signup.

SchemaValid is a free browser-based validator requiring no account or installation.

SEO Schema Markup is a free, MIT-licensed open-source project.

Browse more options in Schema Markup Tools.

Verdict

Schema.dev is a strong choice for SEO and development teams that want free schema generation paired with UI or API validation, especially when bulk work and multi-environment checks matter. Look elsewhere if deployment through tag managers or Cloudflare DNS is a must-have now, or if you require clearly published usage and seat limits.