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“Standard JSON Schema” is not the name of a separate official language or competing specification. It is usually an informal way to refer to JSON Schema that follows a particular specification dialect. If compatibility matters, name the dialect—such as 2020-12—and make sure the validator supports it.
JSON and JSON Schema are different things
JSON is a data interchange format. JSON Schema is a declarative language for describing the structure and constraints of JSON data. As the JSON Schema project explains, a schema can describe the shape and acceptable values of JSON; it is not the JSON data itself.
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A validator is a separate piece of software that checks whether a JSON document conforms to a schema. The schema states the rules; the validator applies them. The official overview distinguishes these roles.
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The phrase is ambiguous. Official project materials do not define “Standard JSON Schema” as a separate specification. Someone using it may simply mean JSON Schema written according to an agreed specification version, or may be using “standard” loosely to distinguish it from a proprietary or custom format. Ask which dialect or compatibility target they mean rather than treating the phrase as a formal version name.
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Why the dialect matters
A JSON Schema dialect is a particular version’s set of keywords and rules for interpreting schemas. The project’s dialect and vocabulary guidance recommends declaring the dialect with the $schema keyword at the schema root. For example:
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object"
}Here, $schema identifies the dialect and its meta-schema, which can itself be used to validate the schema. If the declaration is absent, a validator may rely on external configuration or assumptions, so the same schema could be interpreted differently across setups.
Which JSON Schema version is current?
The JSON Schema project identifies 2020-12 as its current released version. The project’s version index lists the Core and Validation documents for 2020-12 as published on June 16, 2022. This is a specification publication date, not evidence that every validator supports the version.
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Older versions are not completely compatible with 2020-12, according to the project’s learning material. When moving a schema between versions or tools, verify its dialect and test the actual behavior rather than assuming that “standard” guarantees compatibility.
How to check compatibility in practice
- Declare the dialect. Include the appropriate
$schemaURI at the schema root. - Check validator support. Confirm that the specific validator implements that dialect and the vocabularies your schema uses. The specification is divided into Core and Validation and includes vocabulary-specific meta-schemas; see the project’s specification overview.
- Check format behavior. Do not assume every validator enforces every
formatidentically. The project notes that implementations may support only subsets of built-in formats or provide partial validation; see its format guidance. - Test representative instances. Validate both expected-valid and expected-invalid JSON documents with the implementation and configuration you plan to use.
What “standard” does—and does not—tell you
Calling a schema “standard” does not identify its dialect, guarantee support in a particular validator, or settle how features such as formats are evaluated. The practical questions are which dialect is intended, which vocabularies and keywords the schema uses, and how the chosen validator handles them.
The project’s January 13, 2025 publication-process update says it no longer publishes specifications through the IETF and describes the project as independent. That context is not a reason to read “standard JSON Schema” as the name of a rival formal standard; use the project’s explicit dialect name for precision.
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