JSON schema validator

What is JSON Schema validation?

JSON Schema is a vocabulary for annotating and validating JSON documents. It lets you describe the expected structure of your data — which fields are required, what types they should be, and what constraints they must satisfy — then validate any JSON document against that description. Schema validation catches structural problems like missing fields, wrong types, out-of-range values, and malformed strings before they cause bugs downstream.

When to validate against a schema

• Validating API request and response payloads
• Testing webhook payloads before integration
• Checking configuration files match expected formats
• Verifying data pipeline outputs
• Documenting and enforcing data contracts between teams

JSON syntax validation vs. schema validation

Syntax validation checks whether a string is valid JSON at all — are the braces matched, are strings quoted, are commas in the right places? Schema validation goes a step further: given that the JSON is syntactically valid, does it also conform to a specific structure with the right fields, types, formats, and constraints? If you only need to check syntax, the JSON validator is the right tool. If you need to verify structure, use this schema validator.

From validated data to instant insights

If you're working with structured data for analytics or reporting, Basedash can skip the manual validation entirely. Describe the chart or metric you want in plain English, and Basedash writes the query, runs it against your actual data, and renders the visualization — all in seconds. It connects to PostgreSQL, MySQL, BigQuery, Snowflake, and 750+ other data sources.