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Write GraphQL queries as objects instead of strings

This is a better implementation of the GraphQL query API via NodeJS, created as a wrapper of Got. It works like a transpiler, with a built in HTTPRequest Client (Got), allowing you to write your GraphQL queries as Javascript Objects instead of strings.

Built because manipulating strings is a real pain.

Table of Contents

Install

$ npm install gotql

$ yarn install gotql

Basic Usage

const gotQl = require('gotql')

const query = {
  operation: {
    name: 'users',
    fields: ['name', 'age', 'id']
  }
}

const options = {
  headers: {
    "Authorization": "Bearer <token>"
  },
  debug: false,
  useHttp2: false
}

gotQL.query('mygraphqlendpoint.com.br/api', query, options)
  .then(response => console.log(response.data))
  .catch(console.error)

What is it?

GotQL is a better interface for GraphQL queries. It provides a way for developers to run queries using JSON instead of strings. Which is a way more usable data format than the string itself.

See more on: https://hasura.io/blog/fluent-graphql-clients-how-to-write-queries-like-a-boss/

Motivation

Manipulating strings is very smelly, even on dynamically typed languages. So, in order to avoid things such as this:

Which can be translated to something waay more readable in a JSON format like this:

const mutation = {
  operation: {
    name: 'addLog',
    args: {
      logType: literal`status_change`, // Enum Value
      fromState: variables.fromState,
      toState: variables.toState,
      idUser: variables.idUser,
      idCampaign: variables.idCampaign,
      owner: {
        ownerType: variables.ownerType,
        username: variables.username,
        picture: variables.picture,
        name: variables.name,
        id: variables.id
      }
    },
    fields: [ 'uuid' ]
  }
}

This is why GotQL was created.

API

gotQl.query(graphQLEndpoint, query, [options])

Description: Performs a graphQL query

GraphQLEndpoint

Type: string
Description: The GraphQL endpoint to query on

query

Type: object
Description: The JSON-typed query following the json-query format

options

See option object for more information.

gotQl.mutation(graphQLEndpoint, query, [options])

Description: Performs a graphQL mutation

GraphQLEndpoint

Type: string
Description: The GraphQL endpoint to query on

query

Type: object
Description: The JSON-typed query following the json-query format

options

See option object for more information.

gotQl.parser(query, type)

Description: Parses a JSON-Like query and returns the query's string

query

Type: object
Description: The JSON-typed query following the json-query format

type

Type: string
Description: Must be either 'query' or 'mutation'

Option Object

Both gotql.query and gotql.mutation accept an optional user option object with the following API:

Type: object
Description: The option object with the following properties.
- errorStatusCode: Default HTTP status code to be returned on error
  - Type: number
- headers: Additional headers to be sent
  - Type: object, in the form of [headerName: string]: headerValue: string
- gotInstance: Customized Got instance to be used when calling the endpoint
  - Type: got. Internally this will be called as got.post(prependHttp(endPoint), gotPayload)
- useHttp2: Boolean defining if the call should be made using HTTP2, defaults to false (see release 11 of got)
  - Type: boolean

Note: GotQL uses debug internally as default debugger, so you can set debug levels by setting the DEBUG environment variable. These are the current levels:

gotql:info

gotql:info:parser

gotql:info:runner

gotql:errors

Returns

All methods return a string like this:

const response = 'query { test { name args } }'

The JSON query format

The JSON format gotQL uses is a simple and intuitive description based on the anatomy of a GraphQL query blog post.

This is a generic model of a JSONLike query:

const query = {
  name?: string,
  operation: {
    name: string,
    alias?: string,
    args?: { [argName: string]: any } | {
      [argName: string]: {
        value: string,
        escape: boolean
      }
    },
    fields: (string | {
      [fieldName: string]: [{
        args?: { [argName: string]: any } | {
          [argName: string]: {
            value: string,
            escape: boolean
          }
        },
        fields?: (string | { [fieldName: string]: [any] })[]
      }]
    })[]
  },
  variables?: {
    [varName: string]: {
      type: string,
      value: string
    }
  }
}

Description

Query:
- Type: object
- Description: The full query object
- Properties:
  - name: [optional]: Query name
    - Type: string
  - variables: [optional] Query variable declaration
    - Type: object with signature like [varName: string]: { type: string, value: string }
    - Properties:
      - varName: Variable name
        
        Type: string
      - type: Variable type. Can be a GraphQL definition of type (i.e: string!)
        
        Type: string
      - value: Variable value
        
        Type: any
  - operation: The query operation (action that will be executed)
    - Type: object
    - Properties:
      - name: The operation name
        
        Type: string
      - alias: [optional] An alias to give the operation
        
        Type: string
      - args: [optional] The operation args
        
        Type: [argName: string]: any or a detailed arg object
        
        Simple args: An object where the key is the argument name and its value. Accepts variables in the format of argName: '$value'
        
        Example: args { name: 'myName' }
        
        Detailed args: A tagged template. This will give more control over escaping (mostly to use enums). Argument name should be the key
        
        Type: tagged template
        
        Examples: args: { status: literal`an_enum` } should output operation (status: an_enum)...
      - fields: The field list to get back from the operation
        
        Type: An array of object (to use nested fields) or string, or both.
        
        Properties (for nested fields):
        
        Type: object where the field name is the key
        
        fields: Recursive definition, accepts another array just like the fields above.
        
        args: [optional] The field args
        
        Type: [argName: string]: any or a detailed arg object
        
        Simple args: An object where the key is the argument name and its value. Accepts variables in the format of argName: '$value'
        
        Example: args { name: 'myName' }
        
        Detailed args: A tagged template. This will give more control over escaping (mostly to use enums). Argument name should be the key
        
        Type: tagged template
        
        Examples: args: { status: literal`an_enum` } should output operation (status: an_enum)...

Examples

Simple query

const query = {
  operation: {
    name: 'users',
    fields: ['name', 'age']
  }
}

Outputs:

query { users { name age } }

Named query

const query = {
  name: 'myQuery',
  operation: {
    name: 'users',
    fields: ['name', 'age']
  }
}

Outputs:

query myQuery { users { name age } }

Query with simple args

const query = {
  operation: {
    name: 'users',
    args: {
      name: 'Joe'
    },
    fields: ['name', 'age']
  }
}

Outputs:

query { users(name: "Joe") { name age } }

Query with variables

const query = {
  variables: {
    name: {
      type: 'string!',
      value: 'Joe'
    }
  },
  operation: {
    name: 'users',
    args: {
      name: '$name'
    },
    fields: ['name', 'age']
  }
}

Outputs:

query ($name: string!) { users(name: $name) { name age } }

Variables are sent on a separate object to graphQL.

{
  "variables": { "name": "Joe" }
}

Nested fields

const query = {
  operation: {
    name: 'users',
    fields: [
      'name',
      'age',
      {
        friends: {
          fields: ['name', 'age']
        }
      }
    ]
  }
}

Outputs:

query { users { name age friends { name age } } }

Recursive fields can go forever.

Enum and literal args

Enum or literal values should not be escaped, to do that, GotQL has a helper called literal which can be used to tell the query that value will not be escaped:

const { literal } = require('gotql')

const query = {
  operation: {
    name: 'users',
    args: {
      type: literal`internal`
    },
    fields: ['name', 'age']
  }
}

The code above outputs:

query { users(type: internal) { name age } }

The literal helper is just a shorthand to the old-style {value: string, escape: boolean} object like below:

const query = {
  operation: {
    name: 'users',
    args: {
      type: {
        value: 'internal',
        escape: false
      }
    },
    fields: ['name', 'age']
  }
}

If literal is omitted, or if escape is set to true, the output would be:

query { users(type: "internal") { name age } }

Note: Variables such as described here will not be recognized. If the arg object is not an [argName]: value, variables will not pass through the definition check (GotQL warns if a variable is not declared but used on operation).

Contributing to this project

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

Hey! If you want to contribute, please read the contributing guidelines 😄

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khaosdoctor/gotql

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Repository Details

Table of Contents

Install

Basic Usage

What is it?

Motivation

API

Option Object

Returns

The JSON query format

Description

Examples

Simple query

Named query

Query with simple args

Query with variables

Nested fields

Enum and literal args

Contributing to this project

Contributors

Code Contributors

Financial Contributors

Individuals

Organizations

More Repositories