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CLI to transform between JSON, EDN and Transit, powered with a minimal query language.


$ bash <(curl -s
$ echo '{:a 1}' | jet --to json


This is a command line tool to transform between JSON, EDN and Transit, powered with a minimal query language. It runs as a GraalVM binary with fast startup time which makes it suited for shell scripting. It comes with a query language to do intermediate transformation. It may seem familiar to users of jq.



Linux and macOS binaries are provided via brew.


brew install borkdude/brew/jet


brew upgrade jet

Installer script

Install via the installer script:

$ bash <(curl -s

By default this will install into /usr/local/bin. To change this, provide the directory name:

$ bash <(curl -s /tmp


You may also download a binary from Github.


This tool can also be used via the JVM. If you use leiningen, you can put the following in your .lein/profiles:

 {:dependencies [[borkdude/jet "0.0.6"]]
  :aliases {"jet" ["run" "-m" "jet.main"]}}}

And then call jet like:

$ echo '["^ ","~:a",1]' | lein jet --from transit --to edn
{:a 1}


jet supports the following options:

  • --from: edn, transit or json, defaults to edn
  • --to: edn, transit or json, defaults to edn
  • --keywordize [ <key-fn> ]: if present, keywordizes JSON keys. The default transformation function is keyword unless you provide your own.
  • --pretty: if present, pretty-prints JSON and EDN output.
  • --query: given a jet-lang query, transforms input. See jet-lang docs.
  • --collect: given separate values, collects them in a vector.
  • --version: if present, prints current version of jet and exits.
  • --interactive [ cmd ]: if present, starts an interactive shell. An initial command may be provided. See here.


$ echo '{"a": 1}' | jet --from json --to edn
{"a" 1}

$ echo '{"a": 1}' | jet --from json --keywordize --to edn
{:a 1}

$ echo '{"my key": 1}' | jet --from json --keywordize '#(keyword (str/replace % " " "_"))' --to edn
{:my_key 1}

$ echo '{"a": 1}' | jet --from json --to transit
["^ ","a",1]

$ echo '[{:a {:b 1}} {:a {:b 2}}]' \
| jet --from edn --to edn --query '(filter (= [:a :b] #jet/lit 1))'
[{:a {:b 1}}]
  • Get the latest commit SHA and date for a project from Github:
$ curl -s \
| jet --from json --keywordize --to edn \
--query '[0 {:sha :sha :date [:commit :author :date]}]'
{:sha "bde8b1cbacb2b44ad2cd57d5875338f0926c8c0b", :date "2019-08-05T21:11:56Z"}


Jet supports streaming over multiple values, without reading the entire input into memory:

$ echo '{"a": 1} {"a": 1}' | jet --from json --keywordize --query ':a' --to edn

When you want to collect multiple values into a vector, you can use --collect:

$ echo '{"a": 1} {"a": 1}' | lein jet --from json --keywordize --collect --to edn
[{:a 1} {:a 1}]


The --query option supports an intermediate EDN transformation.

$ echo '{:a 1 :b 2 :c 3}' | jet --query '(select-keys [:a :b])'
{:a 1, :b 2}
$ echo '{:a {:b 1}}' | jet --query '[:a :b]'

The query language should be pretty familiar to users of Clojure and jq. For more information about the query language, read the docs here.

Interactive shell

The jet interactive shell can be started with the --interactive flag. Optionally you can provide the first command for the shell as an argument:

$ jet --interactive ':jeti/set-val {:a 1}'
$ curl -sL > /tmp/commits.json
$ jet --interactive ':jeti/slurp "/tmp/commits.json" {:format :json}'

Note that a jeti command has to be valid EDN. To see a list of available commands, type :jeti/help in the shell:

> :jeti/help
Available commands:
:jeti/set-val {:a 1}   : set value.
:jeti/jump "34d4"      : jump to a previous state.
:jeti/quit, :jeti/exit : exit this shell.
:jeti/slurp            : read a file from disk. Type :jeti/help :jeti/slurp for more details.
:jeti/spit             : writes file to disk. Type :jeti/help :jeti/spit for more details.
:jeti/bookmark "name"  : save a bookmark.
:jeti/bookmarks        : show bookmarks.
:jeti/print-length     : set *print-length*
:jeti/print-level      : set *print-level*


Test the JVM version:


Test the native version:

JET_TEST_ENV=native script/test


You will need leiningen and GraalVM.


Support this project

Do you enjoy this project? Consider buying me a hot beverage.


Copyright © 2019 Michiel Borkent

Distributed under the EPL License, same as Clojure. See LICENSE.

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