transit-clj

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from Clojure.

• Rationale
• API docs
• Specification

This implementation's major.minor version number corresponds to the version of the Transit specification it supports.

NOTE: Transit is a work in progress and may evolve based on feedback. As a result, while Transit is a great option for transferring data between applications, it should not yet be used for storing data durably over time. This recommendation will change when the specification is complete.

Releases and Dependency Information

• Latest release: 0.8.309
• All Released Versions

Maven dependency information:

<dependency>
  <groupId>com.cognitect</groupId>
  <artifactId>transit-clj</artifactId>
  <version>0.8.309</version>
</dependency>

Leiningen dependency information:

[com.cognitect/transit-clj "0.8.309"]

Usage

(require '[cognitect.transit :as transit])
(import [java.io ByteArrayInputStream ByteArrayOutputStream])

;; Write data to a stream
(def out (ByteArrayOutputStream. 4096))
(def writer (transit/writer out :json))
(transit/write writer "foo")
(transit/write writer {:a [1 2]})

;; Take a peek at the JSON
(.toString out)
;; => "{\"~#'\":\"foo\"} [\"^ \",\"~:a\",[1,2]]"

;; Read data from a stream
(def in (ByteArrayInputStream. (.toByteArray out)))
(def reader (transit/reader in :json))
(prn (transit/read reader))  ;; => "foo"
(prn (transit/read reader))  ;; => {:a [1 2]}

Default Type Mapping

Transit type	Write accepts	Read returns
null	nil	nil
string	java.lang.String	java.lang.String
boolean	java.lang.Boolean	java.lang.Boolean
integer	java.lang.Byte, java.lang.Short, java.lang.Integer, java.lang.Long	java.lang.Long
decimal	java.lang.Float, java.lang.Double	java.lang.Double
keyword	clojure.lang.Keyword	clojure.lang.Keyword
symbol	clojure.lang.Symbol	clojure.lang.Symbol
big decimal	java.math.BigDecimal	java.math.BigDecimal
big integer	clojure.lang.BigInt,java.math.BigInteger	clojure.lang.BigInt
time	java.util.Date	java.util.Date
uri	java.net.URI, com.cognitect.transit.URI	com.cognitect.transit.URI
uuid	java.util.UUID	java.util.UUID
char	java.lang.Character	java.lang.Character
array	clojure.lang.IPersistentVector, java.util.List	clojure.lang.IPersistentVector
list	clojure.lang.ISeq	clojure.lang.ISeq
set	clojure.lang.IPersistentSet,java.util.Set	clojure.lang.IPersistentSet
map	clojure.lang.IPersistentMap,java.util.Map	clojure.lang.IPersistentMap
link	cognitect.transit.Link	cognitect.transit.Link
ratio +	clojure.lang.Ratio	clojure.lang.Ratio

+ Extension using tagged values

Contributing

This library is open source, developed internally by Cognitect. We welcome discussions of potential problems and enhancement suggestions on the transit-format mailing list. Issues can be filed using GitHub issues for this project. Because transit is incorporated into products and client projects, we prefer to do development internally and are not accepting pull requests or patches.

Copyright and License

Copyright © 2014 Cognitect

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.