> ## Documentation Index > Fetch the complete documentation index at: https://docs.ndi.nace.ai/llms.txt > Use this file to discover all available pages before exploring further. # validate_extract_schema > Validate an extraction schema without creating a job or consuming credits. Cost class: **fast** (pure validation, no I/O, no model inference). Use this before submitting an ``extract`` job to catch schema errors up front. On success ``valid=True`` and ``normalized_schema`` carries the compiled form the extraction pipeline will use. On failure ``valid=False`` and ``errors`` lists every violation — the whole list, not just the first. ## OpenAPI ````yaml /openapi.json post /v1/extract/schema-validation openapi: 3.1.0 info: description: >- Document intelligence: parse, split, classify, extract, and ground files, or build a searchable workspace. Authenticate with ``X-API-Key``. title: NDI Platform API version: 0.1.0 servers: - url: https://ndi-api.nace.ai security: [] tags: [] paths: /v1/extract/schema-validation: post: tags: - document-operations summary: validate_extract_schema description: >- Validate an extraction schema without creating a job or consuming credits. Cost class: **fast** (pure validation, no I/O, no model inference). Use this before submitting an ``extract`` job to catch schema errors up front. On success ``valid=True`` and ``normalized_schema`` carries the compiled form the extraction pipeline will use. On failure ``valid=False`` and ``errors`` lists every violation — the whole list, not just the first. operationId: validate_extract_schema_v1_extract_schema_validation_post requestBody: content: application/json: schema: $ref: >- #/components/schemas/ndi_service__app__platform_api__document_operations__schemas__ExtractSchemaValidationRequest required: true responses: '200': content: application/json: schema: $ref: >- #/components/schemas/ndi_service__app__platform_api__document_operations__schemas__ExtractSchemaValidationResponse description: Successful Response '504': content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' description: Gateway Timeout default: content: application/json: example: error: code: invalid_request detail: null message: >- Request body has extra fields that this operation does not accept. request_id: req-01j9k2n3p4q5r6s7t8v9 retryable: false schema: $ref: '#/components/schemas/ErrorEnvelope' description: >- Typed error envelope used by every 4xx and 5xx. ``error.code`` distinguishes the failure; HTTP status is a consequence of the code. security: - APIKeyHeader: [] components: schemas: ndi_service__app__platform_api__document_operations__schemas__ExtractSchemaValidationRequest: additionalProperties: false description: |- Body for ``POST /v1/extract/schema-validation``. Same mutual-exclusion rule as :class:`ExtractRequest`: exactly one of ``schema_id`` or ``schema`` must be present. Optional ``schema_version`` pins a registry version when resolving ``schema_id``. properties: schema: anyOf: - additionalProperties: $ref: '#/components/schemas/JsonValue' type: object - type: 'null' title: Schema schema_id: anyOf: - type: string - type: 'null' title: Schema Id schema_version: anyOf: - minimum: 1 type: integer - type: 'null' title: Schema Version title: ExtractSchemaValidationRequest type: object ndi_service__app__platform_api__document_operations__schemas__ExtractSchemaValidationResponse: additionalProperties: false description: |- Result of ``POST /v1/extract/schema-validation``. On a valid schema, ``valid=True`` and ``normalized_schema`` carries the compiled form. On an invalid schema, ``valid=False`` and ``errors`` lists every violation found — the whole list, not just the first. properties: errors: items: $ref: '#/components/schemas/SchemaError' title: Errors type: array normalized_schema: anyOf: - additionalProperties: $ref: '#/components/schemas/JsonValue' type: object - type: 'null' title: Normalized Schema valid: title: Valid type: boolean required: - valid title: ExtractSchemaValidationResponse type: object ErrorEnvelope: description: Every non-2xx body on ``/v1``. example: error: code: invalid_request detail: null message: Request body has extra fields that this operation does not accept. request_id: req-01j9k2n3p4q5r6s7t8v9 retryable: false properties: error: $ref: '#/components/schemas/Error' required: - error title: ErrorEnvelope type: object JsonValue: {} SchemaError: additionalProperties: false description: One violation from ``POST /v1/extract/schema-validation``. properties: message: title: Message type: string path: title: Path type: string required: - path - message title: SchemaError type: object Error: description: The error object, per spec 12 §1.8. properties: code: $ref: '#/components/schemas/ErrorCode' detail: anyOf: - additionalProperties: true type: object - type: 'null' description: Structured payload, when the code carries one. title: Detail message: description: Human- and model-readable; says what to do differently. title: Message type: string request_id: description: Per-request correlation id; matches the ``X-Request-Id`` header. title: Request Id type: string retryable: description: Whether retrying the identical request could succeed. title: Retryable type: boolean required: - code - message - retryable - request_id title: Error type: object ErrorCode: description: |- Every error the ``/v1`` surface can return. Clients must treat this as an **open** enum: a new member is an additive change (spec 12 §9), and a client that crashes on an unknown code makes every future error a breaking change. enum: - invalid_request - unsupported_file_type - file_too_large - invalid_schema - invalid_sql - invalid_path_prefix - command_not_permitted - batch_too_large - domain_validation_failed - default_label_required - wait_required_for_zero_retention - workspace_not_found - file_not_found - job_not_found - upload_not_found - node_not_found - schema_not_found - domain_not_found - session_not_found - access_label_not_found - path_conflict - schema_version_conflict - access_label_name_taken - workspace_name_taken - access_label_in_use - upload_expired - file_not_ingested - workspace_deleting - workspace_not_deletable - ingestion_in_progress - job_not_cancellable - confirmation_required - domain_not_published - domain_in_use - reserved_domain_slug - kg_not_built - kg_build_in_progress - session_busy - range_not_satisfiable - result_expired - access_denied - access_backstop_violation - access_mode_not_implemented - rate_limited - concurrency_limit_reached - quota_exceeded - corrupt_file - zero_byte_file - encrypted_file - parse_failed - ocr_failed - conversion_failed - sheetless_workbook - unplayable_media - unclassified_pages - job_cancelled - job_timeout - upstream_unavailable - internal_error - unauthorized - not_implemented title: ErrorCode type: string securitySchemes: APIKeyHeader: in: header name: X-API-Key type: apiKey ````