{"record":{"id":"abf6e0b67ab91aaf","repo":"dgraph-io/dgraph","slug":"while-parsing-graphql-schema","errorCode":null,"errorMessage":"while parsing GraphQL schema","messagePattern":"while parsing GraphQL schema","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"graphql/schema/schemagen.go","lineNumber":49,"sourceCode":"\tGQLSchemaWithoutApolloExtras() string\n}\n\ntype handler struct {\n\tinput          string\n\toriginalDefs   []string\n\tcompleteSchema *ast.Schema\n\tdgraphSchema   string\n\tschemaMeta     *metaInfo\n}\n\n// FromString builds a GraphQL Schema from input string, or returns any parsing\n// or validation errors.\nfunc FromString(schema string, ns uint64) (Schema, error) {\n\t// validator.Prelude includes a bunch of predefined types which help with schema introspection\n\t// queries, hence we include it as part of the schema.\n\tdoc, gqlErr := parser.ParseSchemas(validator.Prelude, &ast.Source{Input: schema})\n\tif gqlErr != nil {\n\t\treturn nil, errors.Wrap(gqlErr, \"while parsing GraphQL schema\")\n\t}\n\n\tgqlSchema, gqlErr := validator.ValidateSchemaDocument(doc)\n\tif gqlErr != nil {\n\t\treturn nil, errors.Wrap(gqlErr, \"while validating GraphQL schema\")\n\t}\n\n\treturn AsSchema(gqlSchema, ns)\n}\n\nfunc (s *handler) MetaInfo() *metaInfo {\n\treturn s.schemaMeta\n}\n\nfunc (s *handler) GQLSchema() string {\n\treturn Stringify(s.completeSchema, s.originalDefs, false)\n}\n","sourceCodeStart":31,"sourceCodeEnd":67,"githubUrl":"https://github.com/dgraph-io/dgraph/blob/759e242be62c91f8d084da06ad0c8d21256d9c07/graphql/schema/schemagen.go#L31-L67","documentation":"FromString parses a GraphQL schema string (with graphql-go's parser, including the validator prelude) before validating it. Any parse failure — syntax errors, invalid type definitions — is wrapped with \"while parsing GraphQL schema\" so callers know the schema text failed at the parsing stage, not the validation stage.","triggerScenarios":"Calling schema.FromString (directly or via SchemaValidate/NewServers/admin schema setup/resetSchema/Resolve) with schema text containing syntax errors: missing braces, invalid field definitions, stray characters, misplaced directives.","commonSituations":"Hand-edited schema files with typos; schema generated from a template with interpolation failures; concatenating schema fragments without newlines; using SDL features unsupported by the parser version.","solutions":["Read the wrapped gqlErr message — it gives the line/column of the syntax problem — and fix the SDL at that location.","Run the schema through SchemaValidate or a local GraphQL SDL linter before deploying.","Check recent diffs to the schema string/file for broken braces or truncated definitions."],"exampleFix":"// before\ntype User {\n  name: string // lowercase primitive; also missing closing brace\n// after\ntype User {\n  name: String!\n}","handlingStrategy":"try-catch","validationCode":"// lint the SDL before handing it to FromString\nif err := schema.SchemaValidate(schemaText); err != nil {\n    return fmt.Errorf(\"schema text invalid: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"sch, err := schema.FromString(schemaText, ns)\nif err != nil {\n    if strings.Contains(err.Error(), \"while parsing GraphQL schema\") {\n        return fmt.Errorf(\"syntax error in SDL: %w\", err)\n    }\n    return err\n}","preventionTips":["Run SchemaValidate (or a SDL linter) on schema files in CI before deploy.","Keep schema SDL in versioned files, not inline string concatenation.","Never build SDL via naive string interpolation without escaping.","Read the wrapped parser error's line/column to fix precisely."],"tags":["graphql","schema","parse-error"],"backgroundTag":"schema-parse-failed","analyzedSha":"759e242be62c91f8d084da06ad0c8d21256d9c07","analyzedAt":"2026-09-01T14:42:12.034Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}