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v4.24.0

  • Support for Python 3.8 has been dropped, as it is nearing end-of-life.

v4.23.0

  • Do not reorder dictionaries (schemas, instances) that are printed as part of validation errors.
  • Declare support for Py3.13

v4.22.0

  • Improve best_match (and thereby error messages from jsonschema.validate) in cases where there are multiple sibling errors from applying anyOf / allOf -- i.e. when multiple elements of a JSON array have errors, we now do prefer showing errors from earlier elements rather than simply showing an error for the full array (#1250).
  • (Micro-)optimize equality checks when comparing for JSON Schema equality by first checking for object identity, as == would.

v4.21.1

  • Slightly speed up the contains keyword by removing some unnecessary validator (re-)creation.

v4.21.0

  • Fix the behavior of enum in the presence of 0 or 1 to properly consider True and False unequal (#1208).
  • Special case the error message for {min,max}{Items,Length,Properties} when they're checking for emptiness rather than true length.

v4.20.0

  • Properly consider items (and properties) to be evaluated by unevaluatedItems (resp. unevaluatedProperties) when behind a $dynamicRef as specified by the 2020 and 2019 specifications.
  • jsonschema.exceptions.ErrorTree.__setitem__ is now deprecated. More broadly, in general users of jsonschema should never be mutating objects owned by the library.

v4.19.2

  • Fix the error message for additional items when used with heterogeneous arrays.
  • Don't leak the additionalItems keyword into JSON Schema draft 2020-12, where it was replaced by items.

v4.19.1

  • Single label hostnames are now properly considered valid according to the hostname format. This is the behavior specified by the relevant RFC (1123). IDN hostname behavior was already correct.

v4.19.0

  • Importing the Validator protocol directly from the package root is deprecated. Import it from jsonschema.protocols.Validator instead.
  • Automatic retrieval of remote references (which is still deprecated) now properly succeeds even if the retrieved resource does not declare which version of JSON Schema it uses. Such resources are assumed to be 2020-12 schemas. This more closely matches the pre-referencing library behavior.

v4.18.6

  • Set a jsonschema specific user agent when automatically retrieving remote references (which is deprecated).

v4.18.5

  • Declare support for Py3.12

v4.18.4

  • Improve the hashability of wrapped referencing exceptions when they contain hashable data.

v4.18.3

  • Properly preserve applicable_validators in extended validators. Specifically, validators extending early drafts where siblings of $ref were ignored will properly ignore siblings in the extended validator.

v4.18.2

  • Fix an additional regression with the deprecated jsonschema.RefResolver and pointer resolution.

v4.18.1

  • Fix a regression with jsonschema.RefResolver based resolution when used in combination with a custom validation dialect (via jsonschema.validators.create).

v4.18.0

This release majorly rehauls the way in which JSON Schema reference resolution is configured. It does so in a way that should be backwards compatible, preserving old behavior whilst emitting deprecation warnings.

  • jsonschema.RefResolver is now deprecated in favor of the new referencing library. referencing will begin in beta, but already is more compliant than the existing $ref support. This change is a culmination of a meaningful chunk of work to make $ref resolution more flexible and more correct. Backwards compatibility should be preserved for existing code which uses RefResolver, though doing so is again now deprecated, and all such use cases should be doable using the new APIs. Please file issues on the referencing tracker if there is functionality missing from it, or here on the jsonschema issue tracker if you have issues with existing code not functioning the same, or with figuring out how to change it to use referencing. In particular, this referencing change includes a change concerning automatic retrieval of remote references (retrieving http://foo/bar automatically within a schema). This behavior has always been a potential security risk and counter to the recommendations of the JSON Schema specifications; it has survived this long essentially only for backwards compatibility reasons, and now explicitly produces warnings. The referencing library itself will not automatically retrieve references if you interact directly with it, so the deprecated behavior is only triggered if you fully rely on the default $ref resolution behavior and also include remote references in your schema, which will still be retrieved during the deprecation period (after which they will become an error).
  • Support for Python 3.7 has been dropped, as it is nearing end-of-life. This should not be a "visible" change in the sense that requires-python has been updated, so users using 3.7 should still receive v4.17.3 when installing the library.
  • On draft 2019-09, unevaluatedItems now properly does not consider items to be evaluated by an additionalItems schema if items is missing from the schema, as the specification says in this case that additionalItems must be completely ignored.
  • Fix the date format checker on Python 3.11 (when format assertion behavior is enabled), where it was too liberal (#1076).
  • Speed up validation of unevaluatedProperties (#1075).

Deprecations

  • jsonschema.RefResolver -- see above for details on the replacement
  • jsonschema.RefResolutionError -- see above for details on the replacement
  • relying on automatic resolution of remote references -- see above for details on the replacement
  • importing jsonschema.ErrorTree -- instead import it via jsonschema.exceptions.ErrorTree
  • importing jsonschema.FormatError -- instead import it via jsonschema.exceptions.FormatError

v4.17.3

  • Fix instantiating validators with cached refs to boolean schemas rather than objects (#1018).

v4.17.2

  • Empty strings are not valid relative JSON Pointers (aren't valid under the RJP format).
  • Durations without (trailing) units are not valid durations (aren't valid under the duration format). This involves changing the dependency used for validating durations (from isoduration to isodate).

v4.17.1

  • The error message when using unevaluatedProperties with a non-trivial schema value (i.e. something other than false) has been improved (#996).

v4.17.0

  • The check_schema method on jsonschema.protocols.Validator instances now enables format validation by default when run. This can catch some additional invalid schemas (e.g. containing invalid regular expressions) where the issue is indeed uncovered by validating against the metaschema with format validation enabled as an assertion.
  • The jsonschema CLI (along with jsonschema.cli the module) are now deprecated. Use check-jsonschema instead, which can be installed via pip install check-jsonschema and found here.

v4.16.1

  • Make ErrorTree have a more grammatically correct repr.

v4.16.0

  • Improve the base URI behavior when resolving a $ref to a resolution URI which is different from the resolved schema's declared $id.
  • Accessing jsonschema.draftN_format_checker is deprecated. Instead, if you want access to the format checker itself, it is exposed as jsonschema.validators.DraftNValidator.FORMAT_CHECKER on any jsonschema.protocols.Validator.

v4.15.0

  • A specific API Reference page is now present in the documentation.
  • $ref on earlier drafts (specifically draft 7 and 6) has been "fixed" to follow the specified behavior when present alongside a sibling $id. Specifically the ID is now properly ignored, and references are resolved against whatever resolution scope was previously relevant.

v4.14.0

  • FormatChecker.cls_checks is deprecated. Use FormatChecker.checks on an instance of FormatChecker instead.
  • unevaluatedItems has been fixed for draft 2019. It's nonetheless discouraged to use draft 2019 for any schemas, new or old.
  • Fix a number of minor annotation issues in protocols.Validator

v4.13.0

  • Add support for creating validator classes whose metaschema uses a different dialect than its schemas. In other words, they may use draft2020-12 to define which schemas are valid, but the schemas themselves use draft7 (or a custom dialect, etc.) to define which instances are valid. Doing this is likely not something most users, even metaschema authors, may need, but occasionally will be useful for advanced use cases.

v4.12.1

  • Fix some stray comments in the README.

v4.12.0

  • Warn at runtime when subclassing validator classes. Doing so was not intended to be public API, though it seems some downstream libraries do so. A future version will make this an error, as it is brittle and better served by composing validator objects instead. Feel free to reach out if there are any cases where changing existing code seems difficult and I can try to provide guidance.

v4.11.0

  • Make the rendered README in PyPI simpler and fancier. Thanks Hynek (#983)!

v4.10.3

  • jsonschema.validators.validator_for now properly uses the explicitly provided default validator even if the $schema URI is not found.

v4.10.2

  • Fix a second place where subclasses may have added attrs attributes (#982).

v4.10.1

  • Fix Validator.evolve (and APIs like iter_errors which call it) for cases where the validator class has been subclassed. Doing so wasn't intended to be public API, but given it didn't warn or raise an error it's of course understandable. The next release however will make it warn (and a future one will make it error). If you need help migrating usage of inheriting from a validator class feel free to open a discussion and I'll try to give some guidance (#982).

v4.10.0

  • Add support for referencing schemas with $ref across different versions of the specification than the referrer's

v4.9.1

  • Update some documentation examples to use newer validator releases in their sample code.

v4.9.0

  • Fix relative $ref resolution when the base URI is a URN or other scheme (#544).
  • pkgutil.resolve_name is now used to retrieve validators provided on the command line. This function is only available on 3.9+, so 3.7 and 3.8 (which are still supported) now rely on the pkgutil_resolve_name backport package. Note however that the CLI itself is due to be deprecated shortly in favor of check-jsonschema.

v4.8.0

  • best_match no longer traverses into anyOf and oneOf when all of the errors within them seem equally applicable. This should lead to clearer error messages in some cases where no branches were matched.

v4.7.2

  • Also have best_match handle cases where the type validator is an array.

v4.7.1

  • Minor tweak of the PyPI hyperlink names

v4.7.0

  • Enhance best_match to prefer errors from branches of the schema which match the instance's type (#728)

v4.6.2

  • Fix a number of minor typos in docstrings, mostly private ones (#969)

v4.6.1

  • Gut the (incomplete) implementation of recursiveRef on draft 2019. It needs completing, but for now can lead to recursion errors (e.g. #847).

v4.6.0

  • Fix unevaluatedProperties and unevaluatedItems for types they should ignore (#949)
  • jsonschema now uses hatch for its build process. This should be completely transparent to end-users (and only matters to contributors).

v4.5.1

  • Revert changes to $dynamicRef which caused a performance regression in v4.5.0

v4.5.0

  • Validator classes for each version now maintain references to the correct corresponding format checker (#905)
  • Development has moved to a GitHub organization. No functional behavior changes are expected from the change.

v4.4.0

  • Add mypy support (#892)
  • Add support for Python 3.11

v4.3.3

  • Properly report deprecation warnings at the right stack level (#899)

v4.3.2

  • Additional performance improvements for resolving refs (#896)

v4.3.1

  • Resolving refs has had performance improvements (#893)

v4.3.0

  • Fix undesired fallback to brute force container uniqueness check on certain input types (#893)
  • Implement a PEP544 Protocol for validator classes (#890)

v4.2.1

  • Pin importlib.resources from below (#877)

v4.2.0

  • Use importlib.resources to load schemas (#873)
  • Ensure all elements of arrays are verified for uniqueness by uniqueItems (#866)

v4.1.2

  • Fix dependentSchemas to properly consider non-object instances to be valid (#850)

v4.1.1

  • Fix prefixItems not indicating which item was invalid within the instance path (#862)

v4.1.0

  • Add Python 3.10 to the list of supported Python versions

v4.0.1

  • Fix the declaration of minimum supported Python version (#846)

v4.0.0

  • Partial support for Draft 2020-12 (as well as 2019-09). Thanks to Thomas Schmidt and Harald Nezbeda.
  • False and 0 are now properly considered non-equal even recursively within a container (#686). As part of this change, uniqueItems validation may be slower in some cases. Please feel free to report any significant performance regressions, though in some cases they may be difficult to address given the specification requirement.
  • The CLI has been improved, and in particular now supports a --output option (with plain (default) or pretty arguments) to control the output format. Future work may add additional machine-parsable output formats.
  • Code surrounding DEFAULT_TYPES and the legacy mechanism for specifying types to validators have been removed, as per the deprecation policy. Validators should use the TypeChecker object to customize the set of Python types corresponding to JSON Schema types.
  • Validation errors now have a json_path attribute, describing their location in JSON path format
  • Support for the IP address and domain name formats has been improved
  • Support for Python 2 and 3.6 has been dropped, with python_requires properly set.
  • multipleOf could overflow when given sufficiently large numbers. Now, when an overflow occurs, jsonschema will fall back to using fraction division (#746).
  • jsonschema.__version__, jsonschema.validators.validators, jsonschema.validators.meta_schemas and jsonschema.RefResolver.in_scope have been deprecated, as has passing a second-argument schema to Validator.iter_errors and Validator.is_valid.

v3.2.0

  • Added a format_nongpl setuptools extra, which installs only format dependencies that are non-GPL (#619).

v3.1.1

  • Temporarily revert the switch to js-regex until #611 and #612 are resolved.

v3.1.0

  • Regular expressions throughout schemas now respect the ECMA 262 dialect, as recommended by the specification (#609).

v3.0.2

  • Fixed a bug where 0 and False were considered equal by const and enum (#575).

v3.0.1

  • Fixed a bug where extending validators did not preserve their notion of which validator property contains $id information.

v3.0.0

  • Support for Draft 6 and Draft 7
  • Draft 7 is now the default
  • New TypeChecker object for more complex type definitions (and overrides)
  • Falling back to isodate for the date-time format checker is no longer attempted, in accordance with the specification

v2.6.0

  • Support for Python 2.6 has been dropped.
  • Improve a few error messages for uniqueItems (#224) and additionalProperties (#317)
  • Fixed an issue with ErrorTree's handling of multiple errors (#288)

v2.5.0

  • Improved performance on CPython by adding caching around ref resolution (#203)

v2.4.0

  • Added a CLI (#134)
  • Added absolute path and absolute schema path to errors (#120)
  • Added relevance
  • Meta-schemas are now loaded via pkgutil

v2.3.0

  • Added by_relevance and best_match (#91)
  • Fixed format to allow adding formats for non-strings (#125)
  • Fixed the uri format to reject URI references (#131)

v2.2.0

  • Compile the host name regex (#127)
  • Allow arbitrary objects to be types (#129)

v2.1.0

  • Support RFC 3339 datetimes in conformance with the spec
  • Fixed error paths for additionalItems + items (#122)
  • Fixed wording for min / maxProperties (#117)

v2.0.0

  • Added create and extend to jsonschema.validators
  • Removed ValidatorMixin
  • Fixed array indices ref resolution (#95)
  • Fixed unknown scheme defragmenting and handling (#102)

v1.3.0

  • Better error tracebacks (#83)
  • Raise exceptions in ErrorTrees for keys not in the instance (#92)
  • __cause__ (#93)

v1.2.0

  • More attributes for ValidationError (#86)
  • Added ValidatorMixin.descend
  • Fixed bad RefResolutionError message (#82)

v1.1.0

  • Canonicalize URIs (#70)
  • Allow attaching exceptions to format errors (#77)

v1.0.0

  • Support for Draft 4
  • Support for format
  • Longs are ints too!
  • Fixed a number of issues with $ref support (#66)
  • Draft4Validator is now the default
  • ValidationError.path is now in sequential order
  • Added ValidatorMixin

v0.8.0

  • Full support for JSON References

  • validates for registering new validators

  • Documentation

  • Bugfixes

    • uniqueItems not so unique (#34)
    • Improper any (#47)

v0.7

  • Partial support for (JSON Pointer) $ref
  • Deprecations
    • Validator is replaced by Draft3Validator with a slightly different interface
    • validator(meta_validate=False)

v0.6

  • Bugfixes
    • Issue #30 - Wrong behavior for the dependencies property validation
    • Fixed a miswritten test

v0.5

  • Bugfixes
    • Issue #17 - require path for error objects
    • Issue #18 - multiple type validation for non-objects

v0.4

  • Preliminary support for programmatic access to error details (Issue #5). There are certainly some corner cases that don't do the right thing yet, but this works mostly.

    In order to make this happen (and also to clean things up a bit), a number of deprecations are necessary:

    • stop_on_error is deprecated in Validator.__init__. Use Validator.iter_errors() instead.
    • number_types and string_types are deprecated there as well. Use types={"number" : ..., "string" : ...} instead.
    • meta_validate is also deprecated, and instead is now accepted as an argument to validate, iter_errors and is_valid.
  • A bugfix or two

v0.3

  • Default for unknown types and properties is now to not error (consistent with the schema).
  • Python 3 support
  • Removed dependency on SecureTypes now that the hash bug has been resolved.
  • "Numerous bug fixes" -- most notably, a divisibleBy error for floats and a bunch of missing typechecks for irrelevant properties.