jsonld-cli
==========

Introduction
------------

This module provides a command line tool `jsonld` to manipulate [JSON-LD][]
data. It is written in JavaScript for [Node.js][] and uses the [jsonld.js][]
and [jsonld-request][] libraries. Inputs can be from stdin, URLs, or files.

## Requirements

* [Node.js][]
* [npm][]

## Installation

### Install from NPM

```
npm install -g jsonld-cli
```

### Use directly with npx

```
npx jsonld-cli ...
```

## Usage

The `jsonld` command line tool can be used to:

 * Check JSON-LD for various problematic data.
 * Transform JSON-LD to compact, expanded, flattened, or canonized form.
 * Transform [RDFa][] to JSON-LD.
 * Canonize JSON-LD/RDFa Datasets to [N-Quads][].

To show tool options, a list of commands, or command options:

    jsonld --help
    jsonld COMMAND --help

To check JSON-LD for some common problems:

    jsonld lint "https://example.com/data.json"

To compact a document on the Web using a JSON-LD context published on
the Web:

    jsonld compact -c "https://w3id.org/payswarm/v1" "http://recipes.payswarm.com/?p=10554"

The command above will read in a PaySwarm Asset and Listing in [RDFa][] 1.0
format, convert it to JSON-LD expanded form, compact it using the
'https://w3id.org/payswarm/v1' context, and dump it out to the console in
compacted form.

    jsonld canonize -q "http://recipes.payswarm.com/?p=10554"

The command above will read in a PaySwarm Asset and Listing in [RDFa][] 1.0
format, canonize the data using the RDF Dataset canonicalization algorithm, and
then dump the output to canonized [N-Quads][] format. The [N-Quads][] can then
be processed via SHA-256, or similar algorithm, to get a deterministic hash of
the contents of the Dataset.

Security Considerations
-----------------------

 * This tool is able to read stdin, local files, and remote resources.
 * Loading of remote resources may reveal aspects of the data being processed.
 * Input data may recursively load remote resources.
 * Input data may load arbitrary local files if allowed.
 * Processing data that uses untrusted remote resources could result in
   unexpected output.

Commercial Support
------------------

Commercial support for this library is available upon request from
[Digital Bazaar][]: support@digitalbazaar.com

Source Code
-----------

https://github.com/digitalbazaar/jsonld-cli

[Digital Bazaar]: https://digitalbazaar.com/
[JSON-LD]: https://json-ld.org/
[N-Quads]: https://www.w3.org/TR/n-quads/
[Node.js]: https://nodejs.org/
[RDFa]: http://www.w3.org/TR/rdfa-core/
[json-ld.org]: https://github.com/json-ld/json-ld.org
[jsonld-request]: https://github.com/digitalbazaar/jsonld-request
[jsonld.js]: https://github.com/digitalbazaar/jsonld.js
[npm]: https://npmjs.org/