Is this a full linter?

No. It checks syntax, not style or logic. Pair with ESLint, Prettier, or your language-specific linter for deeper analysis.

Which JS version does it target?

Modern ECMAScript (the latest stable). If you use experimental syntax (stage 2 or earlier), expect false negatives.

Does the SQL checker know my dialect?

The parser is ANSI-leaning. Vendor extensions (T-SQL specifics, PL/pgSQL) may be flagged even when they would run fine.

$syntax-checker

Testers

Validate syntax for JSON, YAML, JavaScript, HTML, CSS, and SQL. Get line and column numbers for errors. Everything runs in your browser — nothing is sent to a server.

Language:

Code

How it works

Validates using the native JSON.parse() parser. Reports exact position of syntax errors.