GraphQL Variables Formatter — Query Validator
Format and validate GraphQL query variables JSON for use in queries and API clients. Paste your variables JSON alongside a GraphQL query to instantly format the JSON, validate that each variable matches its declared type, catch missing required variables, and highlight undeclared extras.
How to Use GraphQL Variables Formatter — Query Validator
How to Use the GraphQL Variables Formatter
Step 1: Paste Your Variables JSON
In the Variables JSON field, paste the JSON object you plan to send as variables with your GraphQL request. The tool formats it instantly with proper indentation.
Step 2: Paste Your GraphQL Query (Optional)
In the GraphQL Query field, paste the full query or mutation including its variable definitions (e.g., query GetUser($id: ID!, $limit: Int)). This enables type validation.
Step 3: Review the Results
The Formatted JSON panel shows your variables with clean 2-space indentation, ready to copy into any API client.
The Validation Results panel checks:
- ✅ Each variable matches its declared GraphQL type (String, Int, Float, Boolean, ID, lists)
- ❌ Required variables (marked with
!) that are missing - ⚠️ Optional variables that were not provided
- ❌ Variables present in the JSON but not declared in the query
Step 4: Copy Formatted JSON
Click Copy to copy the formatted JSON to your clipboard and paste it into your API client, Postman, Apollo Studio, or code.
Supported Types
- Scalar types:
String,ID,Int,Float,Boolean - Non-null:
Type!— validated as required - List types:
[Type]and[Type!]— validated as arrays with item type checking - Custom/enum types: accepted without type-level validation
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