graphql-language-service-parser

Parsing GraphQL Queries

This feature allows you to parse a GraphQL query string into an Abstract Syntax Tree (AST). The AST can then be used for further analysis or manipulation.

const { parse } = require('graphql-language-service-parser');
const query = `{
  user(id: "1") {
    name
    age
  }
}`;
const ast = parse(query);
console.log(JSON.stringify(ast, null, 2));

Handling Syntax Errors

This feature helps in identifying and handling syntax errors in GraphQL queries. The parser throws an error if the query is not syntactically correct, which can be caught and handled appropriately.

const { parse } = require('graphql-language-service-parser');
const query = `{
  user(id: "1") {
    name
    age
  }
`;
try {
  const ast = parse(query);
} catch (error) {
  console.error('Syntax Error:', error.message);
}

Locating Nodes in AST

This feature allows you to locate specific nodes in the AST based on a character offset. It is useful for features like syntax highlighting and error reporting in IDEs.

const { parse, getLocation } = require('graphql-language-service-parser');
const query = `{
  user(id: "1") {
    name
    age
  }
}`;
const ast = parse(query);
const location = getLocation(query, 10);
console.log(location);