What are GraphQL variables and how do I use them?

What are GraphQL variables and how do I use them?

GraphQL variables allow you to pass dynamic values into your queries and mutations. Instead of hardcoding values, you can define variables in your query.

Can you show me an example of a query using variables?

Sure! Here's a simple example:

query getUser($id: ID!) {
  user(id: $id) {
    name
    email
  }
}

In this query, $id is a variable that you can pass when executing the query.

How do I pass the variable when making the request?

You can pass the variable in the request body. For example:

{
  "query": "query getUser($id: ID!) { user(id: $id) { name email } }",
  "variables": { "id": "1" }
}

Are there any limitations to using variables?

Yes, variables must be defined in the query and can only be used in specific contexts. They also cannot be used to define types.