/ 
GraphQL-Client-0.600
River stage zero No dependents
/ graphql

NAME

graphql - Command-line GraphQL client

VERSION

version 0.600

SYNOPSIS

graphql <URL> <QUERY> [ [--variables JSON] | [--variable KEY=VALUE]... ]
        [--operation-name NAME] [--transport KEY=VALUE]...
        [--[no-]unpack] [--format json|json:pretty|yaml|perl|csv|tsv|table]
        [--output FILE]

graphql --version|--help|--manual

DESCRIPTION

graphql is a command-line program for executing queries and mutations on a GraphQL server.

INSTALL

There are several ways to install graphql to your system.

from CPAN

You can install graphql using cpanm:

cpanm GraphQL::Client

from GitHub

You can also choose to download graphql as a self-contained executable:

curl -OL https://raw.githubusercontent.com/chazmcgarvey/graphql-client/solo/graphql
chmod +x graphql

To hack on the code, clone the repo instead:

git clone https://github.com/chazmcgarvey/graphql-client.git
cd graphql-client
make bootstrap      # installs dependencies; requires cpanm

OPTIONS

--url URL

The URL of the GraphQL server endpoint.

If no --url option is given, the first argument is assumed to be the URL.

This option is required.

Alias: -u

--query STR

The query or mutation to execute.

If no --query option is given, the next argument (after URL) is assumed to be the query.

If the value is "-" (which is the default), the query will be read from STDIN.

See: https://graphql.org/learn/queries/

Alias: --mutation

--variables JSON

Provide the variables as a JSON object.

Aliases: --vars, -V

--variable KEY=VALUE

An alternative way to provide variables. Repeat this option to provide multiple variables.

If used in combination with "--variables JSON", this option is silently ignored.

See: https://graphql.org/learn/queries/#variables

Aliases: --var, -d

--operation-name NAME

Inform the server which query/mutation to execute.

Alias: -n

--output FILE

Write the response to a file instead of STDOUT.

Alias: -o

--transport KEY=VALUE

Key-value pairs for configuring the transport (usually HTTP).

Alias: -t

--format STR

Specify the output format to use. See "FORMAT".

Alias: -f

--unpack

Enables unpack mode.

By default, the response structure is printed as-is from the server, and the program exits 0.

When unpack mode is enabled, if the response completes with no errors, only the data section of the response is printed and the program exits 0. If the response has errors, the whole response structure is printed as-is and the program exits 1.

See "EXAMPLES".

FORMAT

The argument for "--format STR" can be one of:

  • csv - Comma-separated values (requires Text::CSV)

  • json:pretty - Human-readable JSON (default)

  • json - JSON

  • perl - Perl code (requires Data::Dumper)

  • table - Table (requires Text::Table::Any)

  • tsv - Tab-separated values (requires Text::CSV)

  • yaml - YAML (requires YAML)

The csv, tsv, and table formats will only work if the response has a particular shape:

{
    "data" : {
        "onefield" : [
            {
                "key" : "value",
                ...
            },
            ...
        ]
    }
}

or

{
    "data" : {
        "onefield" : [
            "value",
            ...
        ]
    }
}

If the response cannot be formatted, the default format will be used instead, an error message will be printed to STDERR, and the program will exit 3.

Table formatting can be done by one of several different modules, each with its own features and bugs. The default module is Text::Table::Tiny, but this can be overridden using the PERL_TEXT_TABLE environment variable if desired, like this:

PERL_TEXT_TABLE=Text::Table::HTML graphql ... -f table

The list of supported modules is at "@BACKENDS" in Text::Table::Any.

EXAMPLES

Different ways to provide the query/mutation to execute:

graphql http://myserver/graphql {hello}

echo {hello} | graphql http://myserver/graphql

graphql http://myserver/graphql <<END
> {hello}
> END

graphql http://myserver/graphql
Interactive mode engaged! Waiting for a query on <STDIN>...
{hello}
^D

Execute a query with variables:

graphql http://myserver/graphql <<END --var episode=JEDI
> query HeroNameAndFriends($episode: Episode) {
>   hero(episode: $episode) {
>     name
>     friends {
>       name
>     }
>   }
> }
> END

graphql http://myserver/graphql --vars '{"episode":"JEDI"}'

Configure the transport:

graphql http://myserver/graphql {hello} -t headers.authorization='Basic s3cr3t'

This example shows the effect of "--unpack":

graphql http://myserver/graphql {hello}

# Output:
{
    "data" : {
        "hello" : "Hello world!"
    }
}

graphql http://myserver/graphql {hello} --unpack

# Output:
{
    "hello" : "Hello world!"
}

ENVIRONMENT

Some environment variables affect the way graphql behaves:

  • GRAPHQL_CLIENT_DEBUG - Set to 1 to print diagnostic messages to STDERR.

  • GRAPHQL_CLIENT_HTTP_USER_AGENT - Set the HTTP user agent string.

  • PERL_TEXT_TABLE - Set table format backend; see "FORMAT".

EXIT STATUS

Here is a consolidated summary of what exit statuses mean:

  • 0 - Success

  • 1 - Client or server errors

  • 2 - Option usage is wrong

  • 3 - Could not format the response as requested

BUGS

Please report any bugs or feature requests on the bugtracker website https://github.com/chazmcgarvey/graphql-client/issues

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

AUTHOR

Charles McGarvey <chazmcgarvey@brokenzipper.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020 by Charles McGarvey.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.