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GraphQL Request Tester - Online Simple Client

API Developer Tools client GraphQL request tester
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GraphQL Request Tester

Test your GraphQL endpoints instantly. Enter the URL, query, optional variables & headers, and get the response in a clean, formatted view.

Request
The full URL of your GraphQL server.
Write your GraphQL query or mutation here.
Optional. Provide variables as a JSON object.
Optional. One header per line in Key: Value format.
Response
200 OK 0ms 
Send a request to see the response here.

Frequently Asked Questions

GraphQL is a query language for APIs that allows clients to request exactly the data they need. Unlike REST, where you often receive fixed data structures, GraphQL gives you the flexibility to shape responses, reducing over‑fetching and under‑fetching of data.

Simply enter your GraphQL endpoint URL, write a query (or mutation), optionally supply variables and custom headers, then click "Send Request". The tool will show the response status, timing, and formatted JSON body.

Browsers enforce CORS (Cross‑Origin Resource Sharing) for security. If the GraphQL server doesn't include your origin in its Access-Control-Allow-Origin header, requests will be blocked. You can use a browser extension, a CORS proxy, or configure your server to allow your origin.

Use the "Custom Headers" field. Enter one header per line, for example:
Authorization: Bearer eyJhbGciOiJIUzI1NiIs...
These headers will be sent along with your request.

Absolutely. Just write your mutation in the Query field, for example mutation { createUser(name: "Jane") { id } }. The tool sends a POST request with your exact payload, so both queries and mutations are supported.

Ensure your variables are valid JSON. Use double quotes for keys and string values. The tool will alert you if the JSON is invalid. Also verify that your query uses the $variableName syntax and that the variables object includes a matching key.

The response is automatically pretty‑printed with indentation. If the server returns a non‑JSON error, the raw text will be displayed instead. You can copy the formatted response using the copy button.
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