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Malli CHANGELOG

We use Break Versioning. The version numbers follow a <major>.<minor>.<patch> scheme with the following intent:

Bump	Intent
`major`	Major breaking changes -- check the changelog for details.
`minor`	Minor breaking changes -- check the changelog for details.
`patch`	No breaking changes, ever!!

-SNAPSHOT versions are preview versions for upcoming releases.

Malli is in well matured alpha.

UNRELEASED

Compile recursive functions for recursive validators #1245

0.20.0 (2025-11-17)

Optimize -parent-child-transformer #1239
Robust :and parser, add :andn #1182
- Correctly handle recursive schemas #1234
Add JDK 25 to CI #1233

0.19.2 (2025-10-06)

Performance improvements in malli.transform/transformer #1220 and malli.core/-intercepting #1219
malli.clj-kondo/emit! saves to .clj-kondo/imports now as recommended by clj-kondo. #1216
malli.clj-kondo/emit! no longer deletes anything automatically. Use malli.clj-kondo/clean! to clean up.
Add malli.core/old-parse-format for converting output of parse to the pre-0.18.0 format. #1223
FIX: Malli dev-mode no longer throws java.lang.UnsupportedOperationException when printing out an #inst of type java.sql.Date #1214
Updated dependencies:

borkdude/edamame '1.4.30' to '1.4.32'
fipp '0.6.27' to '0.6.29'

0.19.1 (2025-06-09)

Technical release

0.19.0 (2025-06-09)

BREAKING FIX: json-transformer is now better at inferring en/decoders for :enum and :=. #1205
- For example [:enum 1 2 3] gets encoded as a JSON number, not a string.
- If you need the old behaviour, you can override the en/decoders using properties. See docs.
Value generation: :+ and :* now support generator directives :gen/min, :gen/max as well as :min and :max schema directives #1208
CLJS bundle size reduced #1211
FIX: :default/fn now works in map entry properties in addition to schema properties #1209

0.18.0 (2025-05-12)

BREAKING Output of parse now uses new malli.core.Tag and malli.core.Tags records for :orn, :multi, :altn, :catn etc. #1123 #1153
- See Parsing and Unparsing for docs.
BREAKING Swagger and JSON-Schema outputs now use . instead of / (encoded as ~1) as the separator. #1183
- This will only affect you if you rely on the exact name of the schema
Docs: elaborate optional-keys and required-keys #1117
JSON Schema for :tuple now uses "prefixItems" #1151
FIX: :path when explaining :ref errors #1106
FIX: don't instrument functions with primitive type hints (like ^double), instead, emit a warning #1176
FIX: :map-of and :map decode now retain the input map type (eg. sorted-map) #1189
FIX: schemas and into-schemas are printed to the console and the REPL in CLJS the same way as they are in CLJ. #1186
FIX: :merge and :union now work with 1 child. With no children, throw a clearer error. #1147
FIX: default-value-transformer for :refs inside :maps #1145
FIX: generator for empty? schema #1196

0.17.0 (2024-12-08)

Don't output :definitions nil in swagger. #1134
BREAKING: :gen/fmap property requires its schema to create a generator.
- previous behavior defaulted to a nil-returning generator, even if the schema doesn't accept nil
- use :gen/return nil property to restore this behavior
Support decoding map keys into keywords for [:map schemas in json-transformer #1135
:not humanizer #1138
FIX: :seqable generates nil when :min is greater than 0 #1121
FIX: malli.registry/{mode,type} not respected in Babashka #1124
FIX: :float accepts doubles but never generates them #1132
FIX: :float missing humanizer #1122
Updated dependencies:

fipp/fipp '0.6.26' to '0.6.27'

0.16.4 (2024-08-30)

Distribute :merge over :multi #1086, see documentation
:multi with keyword :dispatch accumulates data to generated values #1095
Allow m/-proxy-schema child to be a delay #1090
json-transformer decodes 123.0 into 123 for schemas like :int, pos-int? etc. #986
Fix malli.dev.pretty throws when explaining errors in nested maps #1094
Fix ClojureScript arithmetic warning
Fix (-some-pred []) should return false #1101
Doc mu/assoc and mu/dissoc only handle one key at a time #1099
Try to make map-of-min-max-test less flaky by fixing seed #1098
Updated dependencies:

borkdude/edamame '1.4.25' to '1.4.27'

0.16.3 (2024-08-05)

:-> added to default registry, see documentation.
New :seqable and :every schemas #1041, see docs
Fix OOM error with infinitely expanding schema #1069
Correctly form prop-less schemas that have map/nil as first child #1071
Support min/max on uncountables like eductions #1075
Fix clj-kondo can't parse config.edn written by (malli.dev/start!) #1083
unstrument before instrumenting #1081
Replace .entryAt with .valAt during validation #1079
Corrected DEPRECATED warning for m/-simple-schema #1077

0.16.2 (2024-06-30)

Experimental :-> for simpler function defintions (not available on default schema registry) #1027

[:-> :any] ; [:=> :cat :any]
[:-> :int :any] ; [:=> [:cat :int] :any]
[:-> [:cat :int] :any]  ; [:=> [:cat [:cat :int]] :any]
[:-> a b c d :any] ; [:=> [:cat a b c d] :any]

;; guard property
[:-> {:guard (fn [[[arg] ret]] ...)} :string :boolean]
; [:=> [:cat :string] :boolean [:fn (fn [[[arg] ret]] ...)]]

Fix mu/get-in for false-y keys #1065
Add :float #1055
Make clj-kondo dir configurable #1062
Improve doc for transformers #1058
:double generates Long if :min is Long #1034
Fix Swagger definitions collecting #1002

0.16.1 (2024-04-30)

Enabled Java8 tests back, no need to limit the version.

0.16.0 (2024-04-20)

BREAKING: minimum Java-version is now Java11
allow changing prefix of json-schema $refs via option :malli.json-schema/definitions-path #1045
Inline refs in non-:body swagger parameters #1044
Fix flaky test #1040
Utility to update entry properties: mu/update-entry-properties #1037
Fix actions cache #1036
Only humanize one of :min / :max when different #1032
Distinguish between symbols and strings in humanize #1031
Fix :map-of :min and unreachable generator, explain such-that failures #1029

0.15.0 (2024-03-23)

:=> takes optional 3rd child, the guard schema validating vector of arguments and return value [args ret]. See Function Guards for more details. Fixes #764 and #764.

;; function of arg:int -> ret:int, where arg < ret
[:=>
 [:cat :int]
 :int
 [:fn (fn [[[arg] ret]] (< arg ret))]]

BREAKING: malli.generator/function-checker returns explanations under new keys:
- ::mg/explain-input -> ::m/explain-input
- ::mg/explain-output -> ::m/explain-output
- new ::m/explain-guard to return guard explanation, if any
m/explain for :=> returns also errors for args, return and guard if they exist
FIX m/deref-recursive doesn't play nice with :merge schema #997 via #999
FIX nested :repeat sequence schema's doesn't seem to work #761 via #1024
FIX Invalid Swagger JSON with [:or :nil] alternatives #1006 via #1023
FIX (explain :tuple []) #1022
Enforce entry specs in open map destructurings #1021
FIX goog/mixin was deprecated and is now removed #1016
Updated dependencies:

borkdude/edamame 1.3.23 -> 1.4.25

0.14.0 (2024-01-16)

Better development-time tooling
- malli.dev/start! captures all malli-thrown exceptions, see README for details
- does not log individual re-instrumentation of function vars
- BREAKING: changes in malli.dev.virhe and malli.pretty extension apis, wee #980 for details
New m/deref-recursive to recursive deref all schemas (not :refs)
FIX: Malli generates incorrect clj-kondo spec for :fn schemas #836 via #987
Support for Var references #985, see guide for details.
BREAKING: m/coerce and m/coercer throw ::m/coercion instead of ::m/invalid-input
New Guide for Reusable Schemas
Less printing of Var instumentation
BREAKING: qualified symbols are valid reference types #984
Fixing mt/strip-extra-keys-transformer for recursive map encoding #963
Support passing custom :type in into-schema opt for :map and :map-of #968
mu/path->in works with :orn, :catn and :altn.

0.13.0 (2023-09-24)

BREAKING Fallback to use result of first branch when decoding :or and :orn, #946
BREAKING: decode for :double and double? in cljs doesn't allow trailing garbage any more #942
Faster generators for :map, #948 & #949
FIX: :altn can't handle just one child entry when nested in sequence schema #945
Officially drop Clojure 1.10 support. Tests haven't passed for some time with Clojure 1.10, but this was not noticed due to a faulty CI setup.
Use type inferrer when encoding enums #951
Use bound-fn in malli.dev/start! to preserve *out* #954
FIX: Malli generates invalid clj-kondo type spec for [:map [:keys [:+ :keyword]]] #952
FIX: malli.experimental.describe descriptions of :min and :max are backwards #959
FIX: Malli tuple should generate clj-kondo seqable #962

0.12.0 (2023-08-31)

FIX: retain order with :catn unparse, fixes #925
BREAKING: Do not require timezone data directly for cljs #898 with malli.experimental.time
Remove non-root swagger definitions #900
FIX: malli.core/-comp keeps interceptor order with long chains #905
FIX: malli.dev/start! exception does not contain source #896
FIX: don't add extra :schema nil to swagger :parameters #939
Add :gen/return support in malli.generator #933
Make uuid transformer to be case insensitive #929
Add :default/fn prop for default-value-transformer #927
Updated dependencies:

borkdude/edamame 1.3.20 -> 1.3.23

0.11.0 (2023-04-12)

BREAKING: remove map syntax: mu/from-map-syntax, mu/to-map-syntax. Note that AST syntax and lite syntax remain unchanged.
BREAKING: walking a :schema with an id no longer passes [id] instead of children to the walker function #884
Support converting recursive malli schemas to json-schema #464 #868
Add cherry as alternative CLJS evaluator #888
Replace goog/mixin with Object.assign #890
Simplify uuid regex for accept non-standard and zero uuids #889
Fix clj-doc API import #887

0.10.4 (2023-03-19)

FIX malli.swagger ns, broken test on reitit.

0.10.3 (2023-03-18)

Add support for default branch ::m/default for :map schema #871, see docs.

(m/validate
 [:map
  [:x :int]
  [:y :int]
  [::m/default [:map-of :string :string]]]
 {:x 1, :y 2, "kikka" "kukka"})
; => true

mt/strip-extra-keys-transformer works with :map-of.

(m/decode
 [:map-of :int :int]
 {1 1, 2 "2", "3" 3, "4" "4"}
 (mt/strip-extra-keys-transformer))
; => {1 1}

BREAKING (post-note 16.8.2023, this should have been a MINOR version bump). mt/strip-extra-keys-transformer strips non-defined keys of implicitely open :map:

(m/decode
 [:map [:x :int]]
 {:x 1, :y 2, :z 3}
 (mt/strip-extra-keys-transformer))
; => {:x 1}

m/default-schema to pull the ::m/default schema from entry schemas
m/explicit-keys to get a vector of explicit keys from entry schemas (no ::m/default)
Simplify content-dependent schema creation with m/-simple-schema and m/-collection-schema via new 3-arity :compile function of type children properties options -> props. Old 2-arity top-level callback function is m/deprecated! and support for it will be removed in future versions. #866
FIX Repeated calls to malli.util/assoc-in referencing non-existing maps fail #874
Updated dependencies:

borkdude/edamame 1.1.17 -> 1.3.20

0.10.2 (2023-03-05)

Implement malli.experimental.time schemas for clojurescript using js-joda #853
Allow instrumenting external functions #841
Add clj-kondo support for cljs function schemas #833
Turn on instrumentation for mx/defn with :malli/always meta #825
Support type-properties in m/-map-schema, m/-map-of-schema and m/-tuple-schema #856
FIX: properly compose interceptors in :map-of json-transformer #849
FIX: error paths for :multi schemas when value is not a map #845
FIX: Malli generates :nilable/any which is not a valid type in clj-kondo #821
FIX: mi/collect! without args doesn't work properly #834
Updated dependencies:

mvxcvi/mvxcvi 2.0.0 -> 2.1.0
borkdude/edamame 1.0.0 -> 1.1.17

0.10.1 (2023-01-21)

Strip-extra-keys should not break on non-map values #818

0.10.0 (2023-01-12)

New optional time-schemas for the JVM on top of java.time:
- :time/duration, :time/instant, :time/local-date, :time/local-date-time, :time/local-time, :time/offset-date-time, :time/offset-time, :time/zone-id, :time/zone-offset, :time/zoned-date-time, see README
automatic type inferring with :enum and := with malli.transform and malli.json-schema - detects homogenous :string, :keyword, :symbol, :int and :double), #782 & #784
New malli.core/coercer and malli.core/coerce to both decode and validate a value, see Docs
New malli.core/-no-op-transformer
BREAKING: new implemenation for :map-of inferring via malli.provider/provide:
- Option :malli.provider/map-of-threshold default dropped (was 3)
- New and configurable (malli.provider/map-of-accept) function of stats -> boolean for identifying :map-of
BREAKING: Prefer to real Schemas instead of predicates in inferring (e.g. :int over 'int?)
Adds :pred option to m/-map-schema #767
New :some schema (like some?)
New malli.experimental.describe to describe Schemas in english:

* (require '[malli.experimental.describe :as med])

(med/describe [:map {:closed true} [:x int?]])
; => "map where {:x -> <integer>} with no other keys"

0.9.2 (2022-10-18)

Fix report-fn fn-name symbol constructor in instrument #768

0.9.1 (2022-10-17)

Fix instrument! in dev.cljs/start! - pass cljs function schemas #766

0.9.0 (2022-10-16)

Improve regex driver cache performance #756
Refactor cljs fn instrumentation to happen at runtime #755
Add jdk 19 to ci #760
Fix pos? json schema mapping #757
Generate alphanumeric strings with :min/:max #759
Add cljs instrumentation support for multi-arity and varargs functions #753
Attach fn-name metadata to instrumented CLJS functions #746
Improve generator distribution for sized schemas #748
Group instrumentation logging so it doesn't spam the browser console #747
Fix recursive gen #677, fixed On fixing Malli's recursive generation
Mask valid values by default with malli.dev.pretty/explain #738
Add seq to tuple transformation #735, fixes #734
Switch Value and Errors in the pretty output order, #720
Ensure all examples work without sci unless mentioned otherwise #733
Set additionalProperties if map is closed #719, fixes #716
Fix registry lookup in schema vector syntax, #729, fixes #451
Source-compatible with nbb, #726
Initial Development Guide
Better humanized results with sets
::m/extra-key error retains the error value
New malli.error/error-value utility for compact error value presentation.
BREAKING: me/-push takes extra argument
BREAKING: me/-assoc-in is now called me/-push-in
Updated dependencies:

borkdude/dynaload 0.3.4 -> 0.3.5

0.8.9 (2022-07-01)

Works with Babashka, #718
updated dependencies:

borkdude/dynaload 0.2.2 -> 0.3.4

0.8.8 (2022-06-23)

new guide for Static type checking via Typed Clojure
new guide for To and from JSON
much improved support for instrumentation & type checking with ClojureScript via #660, #661, #662, #667, #681, #685, #696, #697, #700, #703
new malli.dev.pretty/prettier helper, [#672]
faster stripping away extra keys from maps, #674
fix regex unparsing, [#690]
fix Warning under advanced compilation via #692
Map :re schema to clj-kondo :string
added mall.util/explain-data, malli.util/data-explainer and malli.util/keys #707
fix mu/open-schema does not open a closed schema via #709
Show function input arguments on invalid return value
fix Don't lose properties when updating a key
malli.transform/default-value-transformer accepts mt/add-optional-keys option:

(m/decode
 [:map
  [:name [:string {:default "kikka"}]]
  [:description {:optional true} [:string {:default "kikka"}]]]
 {}
 (mt/default-value-transformer {::mt/add-optional-keys true}))
; => {:name "kikka", :description "kikka"}

updated dependencies:

fipp/fipp 0.2.5 -> 0.2.6
borkdude/edamame 0.0.18 -> 1.0.0

0.8.7 (2022-06-23)

technical redeploy

0.8.6 (2022-06-23)

technical redeploy

0.8.5 (2022-06-23)

technical redeploy

0.8.4 (2022-03-02)

support for 2-arity default-fn option in mt/default-value-transformer #582 & #644
fix malli.dev.cljs implementation #655

0.8.3 (2022-02-15)

FIX: qualified-keyword with namespace doesn't generate the ns #642

0.8.2 (2022-02-14)

new ns, malli.experimental.lite, see the docs.

(require '[malli.experimental.lite :as l])

{:id string?
 :tags [:set keyword?]
 :address {:street string?
           :city string?
           :zip (l/optional int?)
           :lonlat [:tuple double? double?]}}

updated deps:

borkdude/edamame 0.0.18 -> 0.0.19

0.8.1 (2022-02-05)

FIX: bug in inferring with value encoders #631
FIX: The malli pretty printer (virhe) is failing when it tries to print a datomic dbwhen it tries to pr #629

0.8.0 (2022-01-23)

new malli.instrument.cljs and malli.dev.cljs namespaces for instrumentationa and dev-tooling for ClojureScript
malli.dev/start! uses malli.dev.pretty/reporter by default
allow :malli/schema to be defined via arglist meta-data, #615
BREAKING: local registries with schemas in vector syntax are stored as identity, not as form
BREAKING: :malli.provider/tuple-threshold has no default value
FIX: me/-resolve-root-error does not respect :error/path, #554
FIX: m/from-ast does not work with symbols or unamespaced keywords, #626
FIX: :+ parsing returns vector, not sequence
new malli.destructure ns for parsing Clojure & Plumatic destructuring binding syntaxes, see Destructuring.

(require '[malli.destructure :as md])

(-> '[a b & cs] (md/parse) :schema)
; => [:cat :any :any [:* :any]]

(-> '[a :- :string, b & cs :- [:* :int]] (md/parse) :schema)
; => [:cat :string :any [:* :int]]

new malli.experimental namespace with schematized defn, automatically registers the functions schemas with m/=>.

(require '[malli.experimental :as mx])

(mx/defn kakka :- :int
  "inline schemas (plumatic-style)"
  [x :- :int] (inc x))

transformer names can be qualified, schema properties support :decode and :encode keys:

(m/decode
  [:string {:decode {:string (partial str "olipa "}}]
  "kerran" mt/string-transformer)
; => "olipa kerran"

malli.dev.pretty/explain for pretty-printing explanations

updated dependencies:

fipp/fipp 0.6.24 -> 0.6.25

0.7.5 (2021-12-19)

clj-kondo 2021.12.16+ can load malli type configs automatically from new location (.clj-kondo/metosin/malli-types/config.edn)
use fipp for fast pretty-printing the clj-kondo configs
updated dependencies:

mvxcvi/arrangement 1.2.0 -> 2.0.0
borkdude/edamame 0.0.11 -> 0.0.18
org.clojure/test.check 1.1.0 -> 1.1.1

0.7.4 (2021-12-18)

schema inferring supports value decoding via options

(mp/provide
 [{:id "caa71a26-5fe1-11ec-bf63-0242ac130002"}
  {:id "8aadbf5e-5fe3-11ec-bf63-0242ac130002"}]
 {::mp/value-decoders {'string? {:uuid mt/-string->uuid}}})
; => [:map [:id :uuid]]

0.7.3 (2021-12-15)

:map-of inferring can be forced with :malli.provider/hint :map-of meta-data:

(require '[malli.provider :as mp])

(mp/provide
  [^{::mp/hint :map-of}
   {:a {:b 1, :c 2}
    :b {:b 2, :c 1}
    :c {:b 3}
    :d nil}])
;[:map-of
; keyword?
; [:maybe [:map
;          [:b int?]
;          [:c {:optional true} int?]]]]

:tuple inferring (supports type-hints and threshold options)

(mp/provide
  [[1 "kikka" true]
   [2 "kukka" true]
   [3 "kakka" true]]
  {::mp/tuple-threshold 3})
; [:tuple int? string? boolean?]

0.7.2 (2021-12-12)

FIX Function with Sequential return value cannot define as function schema #585

0.7.1 (2021-12-11)

FIX decimal? predicate schema was removed in 0.7.0, #590

0.7.0 (2021-12-07)

Performance

big improvements to schema creation, transformation and inferring perfromance, see #531 and #550.

Schema Creation

(def ?schema
  [:map
   [:x boolean?]
   [:y {:optional true} int?]
   [:z [:map
        [:x boolean?]
        [:y {:optional true} int?]]]])

(def schema (m/schema ?schema))

;; 44µs -> 2.5µs (18x)
(bench (m/schema ?schema))

;; 44µs -> 240ns (180x, not realized)
(p/bench (m/schema ?schema {::m/lazy-entries true}))

Schema Transformation

;; 26µs -> 1.2µs (21x)
(bench (m/walk schema (m/schema-walker identity)))

;; 4.2µs -> 0.54µs (7x)
(bench (mu/assoc schema :w :string))

;; 51µs -> 3.4µs (15x)
(bench (mu/closed-schema schema))

;; 5µs -> 28ns (180x)
(p/bench (m/deref-all ref-schema))

;; 134µs -> 9µs (15x)
(p/bench (mu/merge schema schema))

Schema Workers

(def schema (m/schema ?schema))

;; 1.6µs -> 64ns (25x)
(p/bench (m/validate schema {:x true, :z {:x true}}))

;; 1.6µs -> 450ns (3x)
(p/bench (m/explain schema {:x true, :z {:x true}}))

Schema Inferring

(def samples
  [{:id "Lillan"
    :tags #{:artesan :coffee :hotel}
    :address {:street "Ahlmanintie 29"
              :city "Tampere"
              :zip 33100
              :lonlat [61.4858322, 23.7854658]}}
   {:id "Huber",
    :description "Beefy place"
    :tags #{:beef :wine :beer}
    :address {:street "Aleksis Kiven katu 13"
              :city "Tampere"
              :zip 33200
              :lonlat [61.4963599 23.7604916]}}])

;; 126ms -> 2.5ms (50x)
(p/bench (mp/provide samples))

;; 380µs (330x)
(let [provide (mp/provider)]
  (p/bench (provide samples)))

Schema AST

New optimized map-syntax to super-fast schema creation, see README.

(def ast (m/ast ?schema))
;{:type :map,
; :keys {:x {:order 0, :value {:type boolean?}},
;        :y {:order 1, :value {:type int?}
;            :properties {:optional true}},
;        :z {:order 2,
;            :value {:type :map,
;                    :keys {:x {:order 0
;                               :value {:type boolean?}},
;                           :y {:order 1
;                               :value {:type int?}
;                               :properties {:optional true}}}}}}}

;; 150ns (16x)
(p/bench (m/from-ast ast))

(-> ?schema
    (m/schema)
    (m/ast)
    (m/from-ast)
    (m/form)
    (= ?schema))
; => true

Currently in alpha, will fully replace the old map-syntax at some point.

Swappable default registry

No need to play with Compiler options or JVM properties to swap the default registry (only if you want to get DCE on CLJS with small set of schemas). Can be disabled with new malli.registry/mode=strict option.

(require '[malli.core :as m]
         '[malli.util :as mu]
         '[malli.registry :as mr]
         '[malli.generator :as mg])

;; look ma, just works
(mr/set-default-registry!
 (mr/composite-registry
  (m/default-schemas)
  (mu/schemas)))

(mg/generate
 [:merge
  [:map [:x :int]]
  [:map [:y :int]]])
; => {:x 0, :y 92}

Public API

BREAKING: m/explain :errors are plain maps, not Error records.
BREAKING: malli.provider/schema is moved into extender API: malli.provider/-schema
BREAKING: strings generate alphanumeric chars by default
malli.provider supports inferring of :maybe and :map-of
configure default registry in less invasive manner, #488
nil is a valid default with mt/default-value-transformer #576
fixed :schema explain path, #573
fixed :enum explain path, #553
fixed pretty printing of function values, #509
fixed :function lenses
fixed arity error in m/function-schema
add localized error messages for all type-schemas
support for Lazy EntrySchema parsing
empty? Schema does not throw exceptions

Extender API

BREAKING: m/EntrySchema replaces m/MapSchema with new -entry-parser method
BREAKING: (eager) m/-parse-entries is removed, use m/-entry-parser instead
BREAKING: m/-create-form supports 2 & 4 arities (was: 3)
m/EntryParser protocol
m/-entry-forms helper
m/walk-leaf, m/-walk-entries & m/-walk-indexed helpers
m/Cached protocol and m/-create-cache for memoization of -validator, -explainer, -parser and -unparser when using m/validator, m/explain, m/parser and m/unparser.

0.6.1 (2021-08-08)

add missing optional dependency to mvxcvi/arrangement to make pretty printing work

0.6.0 (2021-08-08)

Much faster validators on CLJ (loop unrolling & programming against interfaces) with :or, :and, :orn and :map, thanks to Ben Sless:

;; 164ns -> 28ns
(let [valid? (m/validator [:and [:> 0] [:> 1] [:> 2] [:> 3] [:> 4]])]
  (cc/quick-bench (valid? 5)))

;; 150ns -> 30ns
(let [valid? (m/validator [:map [:a :any] [:b :any] [:c :any] [:d :any] [:e :any]])
      value {:a 1, :b 2, :c 3, :d 4, :e 5}]
  (cc/quick-bench (valid? value)))

Much faster collection transformers on CLJ (loop unrolling & programming against interfaces):

(let [decode (m/decoder
               [:map
                [:id :string]
                [:type :keyword]
                [:address
                 [:map
                  [:street :string]
                  [:lonlat [:tuple :double :double]]]]]
               (mt/json-transformer))
      json {:id "pulla"
            :type "food"
            :address {:street "hämeenkatu 14"
                      :lonlat [61 23.7644223]}}]

  ;; 920ns => 160ns
  (cc/quick-bench
    (decode json)))

Public API

BREAKING: malli.json-schema/unlift-keys is removed in favor of malli.core/-unlift-keys
BREAKING: malli.json-schema/unlift is removed in favor of get
BREAKING: malli.provider/stats is removed (was already deprecated)
BREAKING: malli.util/update doesn't the properties of the key it updates, fixes #412
BREAKING: New rules for humanized errors, see #502, fixes #80, #428 and #499.
new malli.instrument and malli.dev for instrumenting function Vars (e.g. defns), see the guide.
new malli.plantuml namespace for PlantUML generation
new malli.generator/check for generative testing of functions and defns.
new malli.core/parent
:map-of supports :min and :max properties
Collection Schemas emit correct JSON Schema min & max declarations
humanized errors for :boolean & :malli.core/tuple-limit
predicate schema for fn?
malli.util/transform-entries passes in options [#340]/(https://github.com/metosin/malli/pull/340)
BETA: humanized errors can be read from parent schemas (also from map entries), fixes #86:

(-> [:map
     [:foo {:error/message "entry-failure"} :int]]
    (m/explain {:foo "1"})
    (me/humanize {:resolve me/-resolve-root-error}))
; => {:foo ["entry-failure"]}

New experimental pretty printer for schema errors, using fipp.

Extender API

malli.util.impl/-fail! is now malli.core/-fail!
malli.core/-unlift-keys
malli.core/-instrument
BREAKING: malli.core/-register-function-schema! is now 4-arity, new argument is data map
BREAKING: malli.core/-fail! has only arity 1 & 2 versions

0.5.1 (2021-05-02)

Public API

Fix #435: :re ignores :gen/xxx properties in absence of :gen/gen
More customization on -collection-schema #433

0.5.0 (2021-04-28)

Public API

Add ifn? predicate, #416
Accumulate errors correctly with m/-explain with :function and :=> Schemas
New m/properties-schema and m/children-schema to resolve Malli Schemas for IntoSchemas. Empty implementations.
New :gen/schema property for declarative generation, e.g. [:string {:gen/schema :int, :gen/fmap str}]
Support double generator options via schema properties
Fix #419: Parsing bug in :map schema
Fix #418: Better error messages / docs for registry references
Fix #415: Default branch in multi schema are not transformed
Fix #427: Generated sets of :ref are always empty

Extender API

BREAKING: -type is moved from Schema to IntoSchema.
BREAKING: -type-properties is moved from Schema to IntoSchema.
new Protocol methods in IntoSchema Protocol
- (-properties-schema [this options] "maybe returns :map schema describing schema properties")
- (-children-schema [this options] "maybe returns sequence schema describing schema children")

0.4.0 (2021-03-31)

Public API

:nil schema, #401
BREAKING/FIX: parsing :multi returns branch information, #403
:and merges using first child, #405

0.3.1 (2021-03-21)

Public API

Add :orn json-schema & generator, #400
Ignore optional properties in mt/default-value-transformer, #397
Support nil keys in maps, #392
:m/default for :multi, #391
Fix inconsistent park-ing in alt(n)-parser, #390
Fix json schema generation when all attributes of a map are optional, #385
Note about transformers best-effort behavior, #384
Humanized regex/sequence errors, #383
Humanized error for :double, #382

0.3.0 (2021-03-02)

Public API

support for sequence schemas: :cat, catn, alt, altn, :?, :*, :+ and repeat, see Sequence Schemas.
support for parsing and unparsing schemas: m/parse, m/parser, m/unparse, m/unparser, see Parsing values.
support for function schmas: :=> and :function, see Function Schemas.
support for clj-kondo, see Clj-kondo.
new schemas: :any (e.g. any?), :not (complement) and :orn (or with named branches)
:qualified-keyword support :namespace property
FIX: Schema vizualization is not working for [:< ...] like schemas, #370
Ensure we use size 30 for generator (for more variety), #364
Set JSON Schema types and formats for numbers properly #354
-memoize actually memoized. easily 100x faster now #350
Fix interceptor composition, #347
malli.util: add a rename-keys utility, similar to clojure.set #338
Let mu/update accept plain data schemas, #329
mu/find, #322

Extender API

BREAKING: m/Schema has new methods: -parent, -parser and -unparser
BREAKING: m/-coder and m/-chain are replaced wih m/-intercepting
BREAKING: m/-fail! is now miu/-fail!
BREAKING: m/-error is now miu/-error

0.2.1 (2020-10-22)

fix :sequential decoding with empty sequence under mt/json-transformer, fixes #288
- removed broken mt/-sequential->seq

0.2.0 (2020-10-18)

BREAKING (MINOR): m/deref returns original schema, does not throw, fixes #284.
BREAKING (MINOR): the following utilities in malli.util deref top-level refs recursively: merge, union, transform-entries, optional-keys, required-keys, select-keys and dissoc.
m/deref-all derefs all top-level references recursively, e.g.

(m/deref-all [:schema [:schema int?]])
; => int?

:ref, :schema, ::m/schema have now generators, JSON Schema and Swagger support
mu/subschemas walks over top-level :ref and all :schemas.
m/walk can walk over :ref and :schema reference schemas. Walking can be enabled using options :malli.core/walk-refs and :malli.core/walk-schema-refs.
Welcome declarative schema transformations!

There are also declarative versions of schema transforming utilities in malli.util/schemas. These include :merge, :union and :select-keys:

(def registry (merge (m/default-schemas) (mu/schemas)))

(def Merged
  (m/schema
    [:merge
     [:map [:x :string]]
     [:map [:y :int]]]
    {:registry registry}))

Merged
;[:merge
; [:map [:x :string]]
; [:map [:y :int]]]

(m/deref Merged)
;[:map
; [:x :string]
; [:y :int]]

(m/validate Merged {:x "kikka", :y 6})
; => true

New options for SCI:
- :malli.core/disable-sci for explicitly disabling sci, fixes #276
- :malli.core/sci-options for configuring sci
malli.transform/default-value-transformer accepts options :key and :defaults:

(m/decode
  [:map
   [:user [:map
           [:name :string]
           [:description {:ui/default "-"} :string]]]]
  nil
  (mt/default-value-transformer
    {:key :ui/default
     :defaults {:map (constantly {})
                :string (constantly "")}}))
; => {:user {:name "", :description "-"}}

Support microsecond precision when parsing datetime strings. #280

0.1.0 (2020-10-08)

First stable release.

Breaking Changes in pre-alpha:

8.10.2020
- removed :list schema
- removed malli.error/SchemaError protocol in favor of using m/type-properties for custom errors
20.9.2020
- removed m/-predicate-schema, m/-partial-predicate-schema and m/-leaf-schema
19.9.2020
- new mandatory Protocol method in m/Schema: -type-properties
1.9.2020
- m/children returns 3-tuple (key, properties, schema) for MapSchemas
- m/map-entries is removed, m/entries returns a MapEntry of key & m/-val-schema
4.8.2020
- :path in explain is re-implemented: map keys by value, others by child index
- m/-walk and m/Walker uses :path, not :in
- m/-outer has new parameter order: walker schema path children options
- malli.util/path-schemas replaced with malli.util/subschemas & malli.util/distict-by
- LensSchema has a new -key method
- renamed some non-user apis in malli.core & malli.util
- moved map-syntax helpers from malli.core to malli.util
- dynaload com.gfredericks/test.chuck
23.7.2020
- sci is not a default dependency. Enabling sci-support:
  - Clojure: add a dependency to borkdude/sci
  - ClojureScript: also require sci.core (directly or via :preloads)
18.7.2020
- big cleanup of malli.transform internals.
12.7.2020
- malli.mermaid is removed (in favor of malli.dot)
10.7.2020
- [metosin/malli "0.0.1-20200710.075225-19"]
- Visitor is implemented using a Walker.
  - m/accept -> m/walk
  - m/schema-visitor -> m/schema-walker
  - m/map-syntax-visitor -> m/map-syntax-walker
31.6.2020
- new -children method in Schema, to return child schemas as instances (instead of just AST)
17.6.2020
- change all malli.core/*-registry defs into malli.core/*-schemas defns to enable DCE for clojurescript
9.6.2020
- malli.core/name & malli.core/-name renamed to malli.core/type & malli.core/-type
- malli.generator/-generator is renamed to malli.generator/-schema-generator

46 KiB Vendored Raw Blame History

Malli CHANGELOG

UNRELEASED

0.20.0 (2025-11-17)

0.19.2 (2025-10-06)

0.19.1 (2025-06-09)

0.19.0 (2025-06-09)

0.18.0 (2025-05-12)

0.17.0 (2024-12-08)

0.16.4 (2024-08-30)

0.16.3 (2024-08-05)

0.16.2 (2024-06-30)

0.16.1 (2024-04-30)

0.16.0 (2024-04-20)

0.15.0 (2024-03-23)

0.14.0 (2024-01-16)

0.13.0 (2023-09-24)

0.12.0 (2023-08-31)

0.11.0 (2023-04-12)

0.10.4 (2023-03-19)

0.10.3 (2023-03-18)

0.10.2 (2023-03-05)

0.10.1 (2023-01-21)

0.10.0 (2023-01-12)

0.9.2 (2022-10-18)

0.9.1 (2022-10-17)

0.9.0 (2022-10-16)

0.8.9 (2022-07-01)

0.8.8 (2022-06-23)

0.8.7 (2022-06-23)

0.8.6 (2022-06-23)

0.8.5 (2022-06-23)

0.8.4 (2022-03-02)

0.8.3 (2022-02-15)

0.8.2 (2022-02-14)

0.8.1 (2022-02-05)

0.8.0 (2022-01-23)

0.7.5 (2021-12-19)

0.7.4 (2021-12-18)

0.7.3 (2021-12-15)

0.7.2 (2021-12-12)

0.7.1 (2021-12-11)

0.7.0 (2021-12-07)

Performance

Schema Creation

Schema Transformation

Schema Workers

Schema Inferring

Schema AST

Swappable default registry

Public API

Extender API

0.6.1 (2021-08-08)

0.6.0 (2021-08-08)

Public API

Extender API

0.5.1 (2021-05-02)

Public API

0.5.0 (2021-04-28)

Public API

Extender API

0.4.0 (2021-03-31)

Public API

0.3.1 (2021-03-21)

Public API

0.3.0 (2021-03-02)

Public API

Extender API

0.2.1 (2020-10-22)

0.2.0 (2020-10-18)

0.1.0 (2020-10-08)

Breaking Changes in pre-alpha:

46 KiB

Vendored

Raw Blame History