JSON validator

What is JSON validation?

JSON validation checks whether a string conforms to the JSON grammar defined in RFC 8259. A valid JSON document must have correctly matched braces and brackets, double-quoted string keys, properly escaped special characters, and values that are strings, numbers, booleans, null, arrays, or objects — nothing else.

Invalid JSON breaks API calls, config files, data pipelines, and import scripts. A quick validation pass catches the problem before it reaches production.

Common JSON syntax errors

• Trailing commas after the last item in an array or object
• Single quotes instead of double quotes around keys or strings
• Unquoted property keys
• Missing or mismatched brackets and braces
• Comments (JSON does not allow // or /* */)

JSON validation vs. schema validation

Syntax validation answers "is this valid JSON?" — it checks grammar only. Schema validation answers "does this JSON match a specific structure?" using a schema definition (like JSON Schema) that describes required fields, types, and constraints. This tool does syntax validation. If you need structural validation, you'll need a schema validator on top of it.

From validated JSON to instant insights

If you're working with JSON data for analytics or reporting, Basedash can skip the manual parsing 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.