graphqurl

graphqurl

graphqurl is a curl like CLI for GraphQL. It's features include:

• CLI for making GraphQL queries. It also provisions queries with autocomplete.
• Run a custom GraphiQL, where you can specify request's headers, locally against any endpoint
• Use as a library with Node.js or from the browser
• Supports subscriptions
• Export GraphQL schema

Made with :heart: by Hasura

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Table of contents

• Installation
  • Steps to Install CLI
  • Steps to Install Node Library
• Usage
  • CLI
    • Query
    • Auto-complete
    • GraphiQL
    • Subscription
    • Export schema
  • Command
    • Args
    • Flag Reference
  • Node Library
    • Using callbacks:
    • Using Promises:
  • API
    • createClient(options)
    • Client
• More Examples
  • Node Library
    • Queries and Mutations
    • Subscriptions
  • CLI

Installation

Steps to Install CLI

npm install -g graphqurl

Steps to Install Node Library

npm install --save graphqurl

Usage

CLI

Query

gq https://my-graphql-endpoint/graphql \
     -H 'Authorization: Bearer <token>' \
     -q 'query { table { column } }'

Auto-complete

Graphqurl can auto-complete queries using schema introspection. Execute the command without providing a query string:

$ gq <endpoint> [-H <header:value>]
Enter the query, use TAB to auto-complete, Ctrl+Q to execute, Ctrl+C to cancel
gql>

You can use TAB to trigger auto-complete. Ctrl+C to cancel the input and Ctrl+Q/Enter to execute the query.

GraphiQL

Open GraphiQL with a given endpoint:

gq <endpoint> -i

This is a custom GraphiQL where you can specify request's headers.

Subscription

Subscriptions can be executed and the response is streamed on to stdout.

gq <endpoint> \
   -q 'subscription { table { column } }'

Export schema

Export GraphQL schema to GraphQL or JSON format:

gq <endpoint> --introspect > schema.graphql

# json
gq <endpoint> --introspect --format json > schema.json

Command

$ gq ENDPOINT [-q QUERY]

Args

• ENDPOINT: graphql endpoint (can be also set as GRAPHQURL_ENDPOINT env var)

Flag Reference

Flag	Shorthand	Description
--query	-q	GraphQL query to execute
--header	-H	request header
--variable	-v	Variables used in the query
--variablesJSON	-n	Variables used in the query as JSON
--graphiql	-i	Open GraphiQL with the given endpoint, headers, query and variables
--graphiqlHost	-a	Host to use for GraphiQL. (Default: localhost)
--graphiqlPort	-p	Port to use for GraphiQL
--singleLine	-l	Prints output in a single line, does not prettify
--introspect		Introspect the endpoint and get schema
--format		Output format for GraphQL schema after introspection. Options: json, graphql (Default: graphql)
--help	-h	Outputs the command help text
--version		Outputs CLI version
--queryFile		File to read the query from
--operationName		Name of the operation to execute from the query file
--variablesFile		JSON file to read the query variables from

Node Library

Using callbacks:

const { createClient } = require('graphqurl');

const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql',
  headers: {
    'Authorization': 'Bearer <token>'
  }
});

function successCallback(response, queryType, parsedQuery) {
  if (queryType === 'subscription') {
    // handle subscription response
  } else {
    // handle query/mutation response
  }
}

function errorCallback(error, queryType, parsedQuery) {
  console.error(error);
}

client.query(
  {
    query: 'query ($id: Int) { table_by_id (id: $id) { column } }',
    variables: { id: 24 }
  },
  successCallback,
  errorCallback
);

Using Promises:

For queries and mutations,

const { createClient } = require('graphqurl');

const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql',
  headers: {
    'Authorization': 'Bearer <token>'
  }
});

client.query(
  {
    query: 'query ($id: Int) { table_by_id (id: $id) { column } }',
    variables: { id: 24 }
  }
).then((response) => console.log(response))
 .catch((error) => console.error(error));

For subscriptions,

const { createClient } = require('graphqurl');

const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql',
  headers: {
    'Authorization': 'Bearer <token>'
  },
  websocket: {
    endpoint: 'wss://my-graphql-endpoint/graphql',
    onConnectionSuccess: () => console.log('Connected'),
    onConnectionError: () => console.log('Connection Error'),
  }
});

client.subscribe(
  {
    subscription: 'subscription { table { column } }',
  },
  (event) => {
    console.log('Event received: ', event);
    // handle event
  },
  (error) => {
    console.log('Error: ', error);
    // handle error
  }
)

API

createClient

The createClient function is available as a named export. It takes init options and returns client.

const { createClient } = require('graphqurl');

• options: [Object, required] graphqurl init options with the following properties:

  • endpoint: [String, required] GraphQL endpoint
  • headers: [Object] Request header, defaults to {}. These headers will be added along with all the GraphQL queries, mutations and subscriptions made through the client.
  • websocket: [Object] Options for configuring subscriptions over websocket. Subscriptions are not supported if this field is empty.
    • endpoint: [String, ] WebSocket endpoint to run GraphQL subscriptions.
    • shouldRetry: [Boolean] Boolean value whether to retry closed websocket connection. Defaults to false.
    • parameters: [Object] Payload to send the connection init message with
    • onConnectionSuccess: [void => void] Callback function called when the GraphQL connection is successful. Please not that this is different from the websocket connection being open. Please check the followed protocol for more details.
    • onConnectionError: [error => null] Callback function called if the GraphQL connection over websocket is unsuccessful
    • onConnectionKeepAlive: [void => null]: Callback function called when the GraphQL server sends GRAPHQL_CONNECTION_KEEP_ALIVE messages to keep the connection alive.

• Returns: [client]

Client

const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql'
});

The graphqurl client exposeses the following methods:

• client.query: [(queryoptions, successCallback, errorCallback) => Promise (response)]

  • queryOptions: [Object required]
    • query: [String required] The GraphQL query or mutation to be executed over HTTP
    • variables: [Object] GraphQL query variables. Defaults to {}
    • headers: [Object] Header overrides. If you wish to make a GraphQL query while adding to or overriding the headers provided during initalisations, you can pass the headers here.
  • successCallback: [response => null] Success callback which is called after a successful response. It is called with the following parameters:
    • response: The response of your query
  • errorCallback: [error => null] Error callback which is called after the occurrence of an error. It is called with the following parameters:
    • error: The occurred error
  • Returns: [Promise (response) ] This function returns the response wrapped in a promise.
    • response: response is a GraphQL compliant JSON object in case of queries and mutations.

• client.subscribe: [(subscriptionOptions, eventCallback, errorCallback) => Function (stop)]

  • subscriptionOptions: [Object required]
    • subscription: [String required] The GraphQL subscription to be started over WebSocket
    • variables: [Object] GraphQL query variables. Defaults to {}
    • onGraphQLData: [(response) => null] You can optionally pass this function as an event callback
    • onGraphQLError: [(response) => null] You can optionally pass this function as an error callback
    • onGraphQLComplete: [() => null] Callback function called when the GraphQL subscription is declared as complete by the server and no more events will be received
  • eventCallback: [(response) => null] Event callback which is called after receiving an event from the given subscription. It is called with the following parameters:
    • event: The received event from the subscription
  • errorCallback: [error => null] Error callback which is called after the occurrence of an error. It is called with the following parameters:
    • error: The occurred error
  • Returns: [void => null] This is a function to stop the subscription

More Examples

Node Library

Queries and Mutations

Query example with variables

const { createClient } = require('graphqurl');

const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql',
  headers: {
    'x-access-key': 'mysecretxxx',
  },
});

client.query(
  {
    query: `
      query ($name: String) {
        table(where: { column: $name }) {
          id
          column
        }
      }
    `,
    variables: {
      name: 'Alice'
    }
  }
).then((response) => console.log(response))
 .catch((error) => console.error(error));

Subscriptions

Using promises,

const { createClient } = require('graphqurl');
const client = createClient({
  endpoint: 'https://my-graphql-endpoint/graphql',
  headers: {
    'Authorization': 'Bearer Andkw23kj=Kjsdk2902ksdjfkd'
  }
  websocket: {
    endpoint: 'wss://my-graphql-endpoint/graphql',
  }
})

const eventCallback = (event) => {
  console.log('Event received:', event);
  // handle event
};

const errorCallback = (error) => {
  console.log('Error:', error)
};

client.subscribe(
  {
    query: 'subscription { table { column } }',
  },
  eventCallback,
  errorCallback
)

CLI

Generic example:

gq \
     https://my-graphql-endpoint/graphql \
     -H 'Authorization: Bearer <token>' \
     -H 'X-Another-Header: another-header-value' \
     -v 'variable1=value1' \
     -v 'variable2=value2' \
     -q 'query { table { column } }'

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Maintained with :heart: by Hasura