npm:jq.node | Skypack

README

jq.node - Become a shell hero, get super-power

deps Version

jq.node is JavaScript and Lodash in your shell (along with the 1.45M npm modules). It's a powerful command-line JSON/string processor. It so easy it feels like cheating your inner-bearded-sysadmin.

Rational

I'm a huge fan of jq but it was so many times inconsistent and irritating. It sometimes felt like JavaScript but it was not. jq.node is what jq should be in my opinion. First version was written in 25 lines of JavaScript code and was already way more powerful than jq, backed from day one by more than 300 helpers from Lodash FP.

Why jq.node? Why not jq?

jq.node does not try to implement its own expression language, it's pure JavaScript
no need to learn new operators or helpers, if you know lodash/fp, you know jq.node helpers
more powerful than jq will ever be jqn 'filter(has("email")) | groupBy(u => u.email.split("@")[1]) | csv'
through --require command option, jq.node leverages 1.45M npm modules. Hard to do more powerful than that!

Why jq? Why not jq.node?

performance matters more than feature set (in our current implementation jq is faster than jq.node, C vs JavaScript)
some features of jq are not currently implemented in jq.node
jq is a binary, jq.node is a NodeJS project (🌟 accessible through a docker image)

Install (NodeJS)

npm install jq.node -g

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CLI Usage

# the 4 commands below do the same thing
cat users.json | jqn 'filter(has("email")) | groupBy(function(u){return u.email.split("@")[1]}) | csv'
cat users.json | jqn 'filter(has("email")) | groupBy(u => u.email.split("@")[1]) | csv'
cat users.json | jqn 'filter(has("email")) | groupBy(u => get(u.email.split("@"), 1)) | csv'
cat users.json | jqn 'filter(has("email")) | groupBy(flow(get("email"), split("@"), get(1))) | csv'

Note: the pipe | must always be surrounded by space to be understood by jqn as a pipe.

Examples

Be notified when a JSON value changed

while true; do curl -s http://10.10.0.5:9000/api/ce/task?id=AVhoYB1sNTnExzIJOq_k | jqn 'property("task.status"), thru(a => exit(a === "IN_PROGRESS" ? 0 : 1))' || osascript -e 'display notification "Task done"'; sleep 5; done

Open every links from the clipboard

pbpaste | jqn -x -r opn 'split("\n") | forEach(opn)'

pbpaste, echoes clipboard content, MacOS only (use xclip or xsel in Linux)
opn is "a better node-open. Opens stuff like websites, files, executables. Cross-platform."

API Usage

jq.node exposes a node API for programmatic use. Require the jq function from the main module.

The arguments are jq(input, transformation, options, callback)

const { jq } = require('jq.node')

jq('20111031', 'thru(a => moment.utc(a, "YYYYMMDD"))', { rawInput: true, require: 'moment' }, function (err, result) {
  console.log(result) // "2011-10-31T00:00:00.000Z"
})

or with promises and async/await, via the bluebird module:

const { Promisify } = require('bluebird')
const { jq } = Promisify(require('jq.node'))

const result = await jq('20111031', 'thru(a => moment.utc(a, "YYYYMMDD"))', { rawInput: true, require: 'moment' })
console.log(result) // "2011-10-31T00:00:00.000Z"

Options

CLI Shorthand	CLI Longhand	API Option	Type	Purpose
-h	--help	-	-	Display the help message and exit.
-j	--json	json	boolean	Force the result to be output as JSON. Without this, `jqn` outputs strings verbatim and non-strings as JSON.
-x	--raw-input	rawInput	boolean
-c	--color	color	boolean	Colorize JSON (default true)
-r	--require	require	array(string)	* Require a NPM module `<npm-module-name>`.
-v	--version	-	-	Display the version and exit.

jq.node will automatically installs in a temporary folder it if its not available. The module will be available in the expression through its name (e.g. lodash for the lodash module). Module names that are invalid JavaScript variable names (e.g. js-yaml) will be exposed in camel-case format (e.g. jsYaml).

Currently supported

templateSettings, after, ary, assign, assignIn, assignInWith, assignWith, at, before, bind, bindAll, bindKey, castArray, chain, chunk, compact, concat, cond, conforms, constant, countBy, create, curry, curryRight, debounce, defaults, defaultsDeep, defer, delay, difference, differenceBy, differenceWith, drop, dropRight, dropRightWhile, dropWhile, fill, filter, flatMap, flatMapDeep, flatMapDepth, flatten, flattenDeep, flattenDepth, flip, flow, flowRight, fromPairs, functions, functionsIn, groupBy, initial, intersection, intersectionBy, intersectionWith, invert, invertBy, invokeMap, iteratee, keyBy, keys, keysIn, map, mapKeys, mapValues, matches, matchesProperty, memoize, merge, mergeWith, method, methodOf, mixin, negate, nthArg, omit, omitBy, once, orderBy, over, overArgs, overEvery, overSome, partial, partialRight, partition, pick, pickBy, property, propertyOf, pull, pullAll, pullAllBy, pullAllWith, pullAt, range, rangeRight, rearg, reject, remove, rest, reverse, sampleSize, set, setWith, shuffle, slice, sortBy, sortedUniq, sortedUniqBy, split, spread, tail, take, takeRight, takeRightWhile, takeWhile, tap, throttle, thru, toArray, toPairs, toPairsIn, toPath, toPlainObject, transform, unary, union, unionBy, unionWith, uniq, uniqBy, uniqWith, unset, unzip, unzipWith, update, updateWith, values, valuesIn, without, words, wrap, xor, xorBy, xorWith, zip, zipObject, zipObjectDeep, zipWith, entries, entriesIn, extend, extendWith, add, attempt, camelCase, capitalize, ceil, clamp, clone, cloneDeep, cloneDeepWith, cloneWith, conformsTo, deburr, defaultTo, divide, endsWith, eq, escape, escapeRegExp, every, find, findIndex, findKey, findLast, findLastIndex, findLastKey, floor, forEach, forEachRight, forIn, forInRight, forOwn, forOwnRight, get, gt, gte, has, hasIn, head, identity, includes, indexOf, inRange, invoke, isArguments, isArray, isArrayBuffer, isArrayLike, isArrayLikeObject, isBoolean, isBuffer, isDate, isElement, isEmpty, isEqual, isEqualWith, isError, isFinite, isFunction, isInteger, isLength, isMap, isMatch, isMatchWith, isNaN, isNative, isNil, isNull, isNumber, isObject, isObjectLike, isPlainObject, isRegExp, isSafeInteger, isSet, isString, isSymbol, isTypedArray, isUndefined, isWeakMap, isWeakSet, join, kebabCase, last, lastIndexOf, lowerCase, lowerFirst, lt, lte, max, maxBy, mean, meanBy, min, minBy, stubArray, stubFalse, stubObject, stubString, stubTrue, multiply, nth, noConflict, noop, now, pad, padEnd, padStart, parseInt, random, reduce, reduceRight, repeat, replace, result, round, runInContext, sample, size, snakeCase, some, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, startCase, startsWith, subtract, sum, sumBy, template, times, toFinite, toInteger, toLength, toLower, toNumber, toSafeInteger, toString, toUpper, trim, trimEnd, trimStart, truncate, unescape, uniqueId, upperCase, upperFirst, each, eachRight, first are exposed from lodash/fp.
csv is exposed from json2csv
any of 300 000+ npm modules through the --require option!

Performance

jq time sh -c "cat messages.json | jq '.[].type'" 2ms user 0.01s system 95% cpu 0.028 total
jq.node time sh -c "cat messages.json | jqn 'map(\"type\")'" 170ms user 0.03s system 108% cpu 0.181 total