Owner

metosin

39 indexed repositories · View on GitHub

malli
High-performance data-driven data specification library for Clojure/Script.

Clojure · 1767 stars
reitit
A fast data-driven routing library for Clojure/Script

Clojure · 1584 stars
compojure-api
Sweet web apis with Compojure & Swagger

Clojure · 1125 stars
spec-tools
Clojure(Script) tools for clojure.spec

Clojure · 606 stars
muuntaja
Clojure library for fast http api format negotiation, encoding and decoding.

Clojure · 494 stars
jsonista
Clojure library for fast JSON encoding and decoding.

Clojure · 472 stars
ring-swagger
Swagger Spec for Clojure Web Apps

Clojure · 378 stars
kekkonen
A remote (CQRS) API library for Clojure.

Clojure · 228 stars
sieppari
Small, fast, and complete interceptor library for Clojure/Script

Clojure · 218 stars
tilakone
Minimalistic finite state machine (FSM) in Clojure

Clojure · 202 stars
pohjavirta
Fast & Non-blocking Clojure wrapper for Undertow

Clojure · 170 stars
ring-http-response
Handling HTTP Statuses with Clojure(Script)

Clojure · 156 stars
schema-tools
Clojure(Script) tools for Plumatic Schema

Clojure · 110 stars
porsas
Experimental stuff for going fast with Clojure + JDBC & Async SQL

Clojure · 98 stars
talvi
Opinionated and Performant Web Application Stack for Clojure/Script

80 stars
schema-viz
Plumatic Schema visualization using Graphviz.

Clojure · 75 stars
potpuri
Common clojure stuff.

Clojure · 72 stars
komponentit
Collection of bespoke Reagent components

Clojure · 64 stars
bat-test
Fast Clojure.test runner for Boot and Leiningen

Clojure · 60 stars
ring-swagger-ui
Swagger UI packaged for Ring Apps

Clojure · 55 stars
19 more repositories live on View on GitHub

Beginner friendly Everything

Open All

malli.util/keys does not work with :merge Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

metosin/malli#1310 · 2 comments · Opened Aug 20, 2026
Hide parts of schema in OpenAPI spec Open

enhancement help wanted

Difficulty 3/5 1-2 days Newbie friendliness 62/100

metosin/malli#1309 · 1 comment · Opened Aug 18, 2026
malli.error/humanize with malli.error/-resolve-root-error throws with `:or` schema of `:closed` `:map`s Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

metosin/malli#1308 · 1 comment · Opened Aug 17, 2026
Extend documentation on :conflicting routes Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

metosin/reitit#787 · Opened Aug 5, 2026
Optimization: share Schema objects between property registry and body Open

Clojurists Together enhancement

metosin/malli#1294 · 1 assignee · Opened Jun 28, 2026
Optimization: share Schema objects within property registry Open

Clojurists Together enhancement

metosin/malli#1293 · 1 assignee · Opened Jun 28, 2026
Optimization: reuse `into-schema` result in same scope Open

Clojurists Together enhancement

metosin/malli#1292 · 1 assignee · Opened Jun 28, 2026
Bounded integer generator not evenly distributed Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

metosin/malli#1291 · Opened Jun 17, 2026
Cannot distinguish between key or val error with `:map-of` humanization Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

metosin/malli#1290 · Opened Jun 14, 2026
Binary arity for `throw!` fn Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

metosin/ring-http-response#39 · 1 comment · Opened Jun 6, 2026
JSON Schema If-Then-Else conditional construct support Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

metosin/malli#1287 · Opened May 10, 2026
Improved explanation for `:decode/x` and decoders / transformers Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 48/100

metosin/malli#1282 · Opened Apr 30, 2026
Full support for decimal Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 50/100

metosin/malli#1272 · 1 comment · Opened Apr 1, 2026
Automate releases Open

metosin/ring-swagger-ui#34 · 1 assignee · Opened Mar 27, 2026
Is it possible to get coercion errors without blocking responses? Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/reitit#777 · 2 comments · Opened Jan 23, 2026
Upgrade to OpenAPI 3.2.0 Open

enhancement for discussion

Difficulty 3/5 1-2 days Newbie friendliness 45/100

metosin/reitit#775 · 1 reaction · Opened Jan 23, 2026
StackOverflow error related to `malli.core/register-function-schema` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 28/100

metosin/malli#1253 · 4 comments · Opened Jan 8, 2026
JSONSchema transformation of discriminated unions behaves differently from Zod Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

metosin/malli#1246 · Opened Dec 4, 2025
Support for `ring.swagger.json-schema/describe` Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

metosin/schema-tools#95 · 1 comment · Opened Dec 4, 2025
Add separate main ns for React 17 use Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/reagent-dev-tools#11 · Opened Nov 19, 2025
Support ISO 8601 strings in malli.experimental.time/schemas Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

metosin/malli#1238 · 1 comment · Opened Oct 31, 2025
Jackson 3.x usage Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/jsonista#89 · 2 comments · Opened Oct 28, 2025
OpenAPI, multipart and `:request` Open

enhancement

metosin/reitit#759 · 1 comment · 1 assignee · Opened Oct 24, 2025
Implement `-parse-info` for sequence regexes Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/malli#1230 · 1 comment · Opened Oct 16, 2025
Add support for MCP version 2025-06-18 Open

enhancement

metosin/mcp-toolkit#14 · 4 comments · 1 assignee · Opened Jul 17, 2025
Investigate "An error should be sent back when receiving empty vector of message" Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 25/100

metosin/mcp-toolkit#13 · Opened Jul 17, 2025
Implement a Stream HTTP transport example Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/mcp-toolkit#12 · Opened Jul 17, 2025
Make the lib usable for stateless servers Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/mcp-toolkit#11 · Opened Jul 17, 2025
read-values can't read sequence of arrays Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

metosin/jsonista#88 · 2 comments · 2 reactions · Opened Jul 14, 2025
Attempt running the example server on Babashka Open

side-quest

Difficulty 4/5 3-5 days Newbie friendliness 25/100

metosin/mcp-toolkit#7 · 1 comment · Opened Jun 12, 2025
Use Malli to verify the format of prompts, resources, tools and messages provided by the users Open

enhancement

metosin/mcp-toolkit#5 · 1 comment · 1 assignee · Opened Jun 12, 2025
Write tests Open

enhancement

metosin/mcp-toolkit#3 · 1 comment · 1 assignee · Opened Jun 12, 2025
Improve the documentation Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

metosin/mcp-toolkit#2 · Opened Jun 12, 2025
Idea: strict-response-coercion-middleware Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/reitit#737 · 1 reaction · Opened Apr 25, 2025
Idea: strict-content-type-middleware Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

metosin/reitit#736 · Opened Apr 25, 2025
Property Registries should allow IntoSchema instances Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/malli#1181 · Opened Mar 26, 2025
Routing with regex based constraints Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

metosin/reitit#722 · 3 comments · 1 reaction · Opened Feb 24, 2025
Middleware compilers don't get access to route path Open

enhancement for discussion

Difficulty 3/5 1-2 days Newbie friendliness 45/100

metosin/reitit#720 · 1 reaction · Opened Feb 10, 2025
Duplicate key on output Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/jsonista#87 · 1 comment · Opened Jan 22, 2025
Reagent/fe-frame examples break the reload-on-save Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

metosin/reitit#713 · Opened Dec 19, 2024
Pretty Printer StackOverflows on schema Open

question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/malli#1149 · 3 comments · Opened Dec 13, 2024
Named schema support in Swagger & OpenAPI for Schema Open

enhancement

metosin/reitit#710 · 2 comments · 1 assignee · Opened Nov 28, 2024
Named schema support in Swagger & OpenAPI for Spec Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

metosin/reitit#709 · 1 comment · 1 reaction · Opened Nov 28, 2024
Opaque assertion errors with infinite bounds Open

generator

Difficulty 3/5 1-2 days Newbie friendliness 35/100

metosin/malli#1133 · Opened Nov 24, 2024
Opaque `such-that` error when using `##NaN` as bound Open

generator help wanted

metosin/malli#1130 · 1 assignee · Opened Nov 24, 2024
Double generator fails if `{:max (- Double/MAX_VALUE)}` Open

bug generator help wanted

Difficulty 3/5 1-2 days Newbie friendliness 35/100

metosin/malli#1128 · Opened Nov 24, 2024
`:interceptors` does not flatten vectors like `:middleware` -> cannot succinctly compose chains of interceptors Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

metosin/reitit#707 · 2 comments · Opened Nov 12, 2024
Nested map with invalid value breaks `strip-extra-keys-transformer` when using `map-of` Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

metosin/malli#1118 · 4 comments · Opened Nov 11, 2024
time humanize error brings "unknown error" Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 38/100

metosin/malli#1114 · 3 comments · 1 reaction · Opened Oct 14, 2024
OpenAPI & Swagger generation fail for `st/spec` inside `s/or` Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

metosin/spec-tools#291 · 2 reactions · Opened Oct 11, 2024

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