Jora is a powerful query language for JavaScript objects, allowing you to perform complex queries and transformations on JSON-like data structures. It is particularly useful for data manipulation, filtering, and aggregation.
Basic Querying
This feature allows you to extract specific fields from an array of objects. In this example, it extracts the 'name' field from each object in the array.
const jora = require('jora');
const data = [{ name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }];
const result = jora('name')(data);
console.log(result); // ['Alice', 'Bob']Filtering
This feature allows you to filter objects based on certain conditions. In this example, it filters out objects where the 'age' field is greater than 25.
const jora = require('jora');
const data = [{ name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }];
const result = jora('[age > 25]')(data);
console.log(result); // [{ name: 'Alice', age: 30 }]Aggregation
This feature allows you to perform aggregation operations on fields. In this example, it calculates the sum of the 'age' field across all objects.
const jora = require('jora');
const data = [{ name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }];
const result = jora('age.sum()')(data);
console.log(result); // 55Nested Queries
This feature allows you to perform queries on nested structures. In this example, it extracts the 'name' field from each object within the 'users' array.
const jora = require('jora');
const data = { users: [{ name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }] };
const result = jora('users[name]')(data);
console.log(result); // ['Alice', 'Bob']Lodash is a popular utility library that provides a wide range of functions for manipulating arrays, objects, and other data structures. While it does not offer a query language like Jora, it provides similar functionalities through its collection of utility functions.
Json-query is a lightweight library for querying JSON data. It offers a simpler syntax compared to Jora but is less powerful in terms of the complexity of queries it can handle.
Jq is a command-line tool for processing JSON data. It offers a powerful query language similar to Jora but is designed to be used in a command-line environment rather than within JavaScript code.
JavaScript object query language, and a library to process and perform Jora queries on data.
STATUS: Jora is stable, but syntax may change in next releases. Still very much work in progress (ideas and thoughts).
Features:
Related projects:
Table of content:
Jora is a query language designed for JSON-like data structures. It extends JSON5 and shares many similarities with JavaScript.
See Docs & playground.
// single-line comment
/* multi-line
comment */
Jora expressions are the building blocks of Jora queries. Expressions can include comments, literals, operators, functions, and variables.
Jora supports literals, which include:
42, -3.14, 6.022e23"hello", 'world', `template${yes}`, "\u{1F600}"true, false/regexp/flags{ hello: 'world' } (see Object literals)[1, 2, 3] (see Array literals)=> … (see Functions)NaN, Infinity, null and undefinedSee Literals
Jora supports most JavaScript operators, including:
+, -, *, /, %=, !=, <, <=, >, >=, ~=and, or, not (alias no), ??, is, in, not in, has, has no?:( )|See Operators
Jora provides notations for accessing properties and elements: dot, bracket and slice notations. Dot notation is similar to JavaScript's property access notation, using a period followed by the property name (e.g., $.propertyName). Bracket notation encloses the property name or index within square brackets (e.g., $['propertyName'] or $[0]), it's also possible to use functions to choose. Slice notation provides a concise syntax to slice elements with optional step (array[5:10:2] selects each odd element from 5th to 10th indecies).
Jora provides a rich set of built-in methods for manipulating data, such as map(), filter(), group(), sort(), reduce(), and many others. You can also define custom functions using the => arrow function syntax, and use them as a method.
group() methodsort() methodJora has a concise syntax for mapping and filtering. The map(fn) method is equivalent to .(fn()), while the filter(fn) method is equivalent to .[fn()].
.[…] and filter() method.(…) and map() method..(…)Variables in Jora are helpful for storing intermediate results or simplifying complex expressions. To define a variable, use the $variableName: expression; syntax.
See Variables
Install with npm:
npm install jora
Basic usage:
// ESM
import jora from 'jora';
// CommonJS
const jora = require('jora');
Bundles are available for use in a browser:
dist/jora.js – minified IIFE with jora as global<script src="node_modules/jora/dist/jora.js"></script>
<script>
jora('query')(data, context);
</script>
dist/jora.esm.js – minified ES module<script type="module">
import jora from 'node_modules/jora/dist/jora.esm.js'
// ...
</script>
By default (for short path) a ESM version is exposing. For IIFE version a full path to a bundle should be specified. One of CDN services like unpkg or jsDelivr can be used:
jsDeliver
<!-- ESM -->
<script type="module">
import jora from 'https://cdn.jsdelivr.net/npm/jora';
</script>
<!-- IIFE with an export `jora` to global -->
<script src="https://cdn.jsdelivr.net/npm/jora/dist/jora.js"></script>
unpkg
<!-- ESM -->
<script type="module">
import jora from 'https://unpkg.com/jora';
</script>
<!-- IIFE with an export `jora` to global -->
<script src="https://unpkg.com/jora/dist/jora.js"></script>
import jora from 'jora';
// create a query
const query = jora('foo.bar');
// perform a query
const result = query(data, context);
See the details in Jora library API
Get npm dependency paths (as a tree) that have packages with more than one version:
import jora from 'jora';
import { exec } from 'child_process';
function printTree() {
// see implementation in examples/npm-ls.js
}
exec('npm ls --all --json', (error, stdout) => {
if (error) {
return;
}
const npmTree = JSON.parse(stdout);
const depsPathsToMultipleVersionPackages = jora(`
$normalizedDeps: => dependencies.entries().({ name: key, ...value });
$multiVersionPackages:
..$normalizedDeps()
.group(=>name, =>version)
.({ name: key, versions: value.sort() })
.[versions.size() > 1];
$pathToMultiVersionPackages: => .($name; {
name,
version,
otherVersions: $multiVersionPackages[=>name=$name].versions - version,
dependencies: $normalizedDeps()
.$pathToMultiVersionPackages()
.[name in $multiVersionPackages.name or dependencies]
});
$pathToMultiVersionPackages()
`)(npmTree);
printTree(depsPathsToMultipleVersionPackages);
});
Example of output:
jora@1.0.0
├─ c8@7.11.0
│ ├─ istanbul-lib-report@3.0.0
│ │ └─ supports-color@7.2.0 [more versions: 8.1.1]
│ ├─ test-exclude@6.0.0
│ │ └─ minimatch@3.1.2 [more versions: 3.0.4]
│ ├─ v8-to-istanbul@8.1.1
│ │ └─ convert-source-map@1.8.0
│ │ └─ safe-buffer@5.1.2 [more versions: 5.2.1]
│ ├─ yargs-parser@20.2.9 [more versions: 20.2.4]
│ └─ yargs@16.2.0
│ └─ yargs-parser@20.2.9 [more versions: 20.2.4]
├─ eslint@8.10.0
│ ├─ @eslint/eslintrc@1.2.0
│ │ ├─ ignore@4.0.6 [more versions: 5.2.0]
│ │ └─ minimatch@3.1.2 [more versions: 3.0.4]
...
See more examples in Complex Jora query examples
FAQs
JavaScript object query engine
The npm package jora receives a total of 112,334 weekly downloads. As such, jora popularity was classified as popular.
We found that jora demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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