GraphQL Playground

GraphQL Playground | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Development
Input types: text, textarea
Output type: interactive
Sample coverage: 4
API ready: Yes

Overview

The GraphQL Playground is an interactive, in-browser client that allows you to write queries and mutations, configure variables and headers, and send requests directly to any GraphQL endpoint to inspect formatted JSON responses or error arrays.

When to use

When you need to test and debug GraphQL queries or mutations against a live API endpoint without writing code.
When you want to inspect the structure of returned JSON payloads or troubleshoot GraphQL error arrays during schema development.
When you need to verify API authentication headers or test query variables dynamically in a sandbox environment.

How it works

1Enter the target GraphQL API URL in the Endpoint field and add any required authentication headers.
2Write your GraphQL query or mutation in the Query editor, and define dynamic parameters in the Variables section.
3Click the send button to execute the request and view the formatted JSON response or error details in real time.

Use cases

Testing public GraphQL APIs to understand their schema and data structures before integration.
Debugging complex queries with dynamic variables and custom headers during backend development.
Verifying error handling by sending malformed queries or invalid variables to the endpoint.

Examples

1. Querying Country Data from a Public API

Frontend Developer

Background

A developer needs to fetch a list of continents and their codes to populate a dropdown menu in a web application.

Problem

Verifying the exact JSON structure returned by the public Countries API before writing frontend code.

How to use

Set the endpoint to https://countries.trevorblades.com/, paste the query for continents, and execute the request.

Endpoint: https://countries.trevorblades.com/
Query:
query {
  continents {
    code
    name
  }
}

Outcome

The tool displays a formatted JSON response containing an array of continents with their codes and names.

2. Testing a Protected Mutation with Variables

Backend Engineer

Background

An engineer is developing a user registration system and needs to test the createUser mutation which requires an API key header and input variables.

Problem

Ensuring the mutation correctly processes input variables and returns the newly created user ID under authenticated conditions.

How to use

FAQ

Can I use this tool with local GraphQL servers?

Yes, you can target local endpoints like http://localhost:4000/graphql as long as your browser can access them and CORS is configured.

How do I pass authentication tokens to my GraphQL endpoint?

Enter your credentials in the Headers field using standard HTTP header format, such as Authorization: Bearer <token>.

What format should I use for query variables?

Variables must be written in valid JSON format, matching the variable names defined in your GraphQL query.

Does this client support GraphQL mutations?

Yes, you can execute both queries and mutations by writing them in the Query editor.

What happens if my query contains syntax errors?

The playground will return the GraphQL error array containing details about the syntax or validation issues.

Endpoint: https://api.dev.local/graphql
Headers:
x-api-key: dev-secret-key
Query:
mutation CreateUser($input: UserInput!) {
  createUser(input: $input) {
    id
    email
  }
}
Variables:
{
  "input": {
    "email": "[email protected]",
    "name": "Test User"
  }
}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Querying Country Data from a Public API

2. Testing a Protected Mutation with Variables

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