Workflow
Validate an API payload
Fix syntax, then test the document against its schema.
Data Toolkit capability
JSON & CSV Validation Tools
Check syntax, schemas, headers, encodings, and delimiters before bad data reaches another system.
Your files never leave your computer.All processing happens locally inside your browser.
- 4 focused production utilities
- No signup and no server-side file processing
- Use one tool or follow a complete workflow
Choose the right workflow
Validation tools answer one question early: is this data safe to hand to the next step? Use them before imports, deployments, API calls, or transformations.
- Use JSON Formatter & Validator for malformed JSON and readable output.
- Use JSON Schema Validator when a payload must satisfy a formal contract.
- Use CSV Header Inspector for column-name problems, or Encoding & Delimiter Detector when a file opens incorrectly.
Workflow
Prepare a CSV import
Confirm file encoding, delimiter, and header quality.
All available tools
Explore json & csv validation tools
JSON Schema ValidatorValidate JSON against a draft-07 schema and inspect every error.CSV Encoding & Delimiter DetectorIdentify CSV encoding, separators, line endings, and import risks.CSV Header Inspector & ValidatorCatch duplicate, blank, and risky headers before an import.JSON Formatter & ValidatorFormat, validate, minify, and download JSON privately.