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Validation tools

Validate JSON, YAML, TOML, environment files, cron expressions and more against their documented rules, with clear error locations and no uploads.

14 tools in this category, all running in your browser.

Tools in Validation

  • JSON Validator

    /tools/json-validator/

    Check whether a document is valid JSON and report the first syntax error with its position.

    JSON · Validation · Developer

  • Regex Tester

    /tools/regex-tester/

    Test a regular expression against a subject and inspect matches and capture groups.

    Text · Validation · Developer

  • JSON Schema Validator

    /tools/json-schema-validator/

    Validate JSON against a JSON Schema subset and list every violation.

    JSON · Validation · Developer

  • Git Command Lookup

    /tools/git-command-lookup/

    Look up real Git commands by task with syntax and examples.

    Developer · Validation

  • AWS Cron Validator

    /tools/aws-cron-validator/

    Validate and explain an AWS EventBridge six-field cron expression in your browser.

    Developer · Validation

  • DNS Record Parser

    /tools/dns-record-parser/

    Parse pasted DNS zone or dig output into structured records.

    Networking · Validation · Developer

  • Title & Meta Checker

    /tools/title-meta-checker/

    Audit a page title and meta description for length and quality.

    Validation · Developer

  • Sitemap Validator

    /tools/sitemap-validator/

    Validate an XML sitemap against the sitemaps.org protocol.

    Validation · Developer

  • Canonical Checker

    /tools/canonical-checker/

    Check a canonical URL for common duplicate-content risks.

    Validation · Developer

  • JSON-LD Helper

    /tools/json-ld-helper/

    Format, validate and inspect JSON-LD structured data.

    Developer · Validation

  • SQL Validator

    /tools/sql-validator/

    Check a SQL statement for structural problems such as unbalanced parentheses, unterminated strings or comments, and an unrecognised leading command, for PostgreSQL, MySQL, SQLite or T-SQL, locally in your browser.

    Developer · Validation

  • SQL Safety Checker

    /tools/sql-safety-checker/

    Scan SQL for destructive statements such as DROP, TRUNCATE, DELETE or UPDATE without a WHERE clause, ALTER ... DROP and privilege changes, and see each one explained, without ever running it.

    Developer · Validation

  • Structured Output Helper

    /tools/structured-output-helper/

    Build a strict structured-output contract from a sample JSON value, or repair fenced/trailing-comma JSON into valid JSON — locally.

    Developer · JSON · Validation

  • AI Website Scanner

    /tools/ai-website-scanner/

    Scan a public page for AI-readiness signals — crawl policy, metadata, structured data and readable content — through a stateless SSRF-safe fetch.

    Validation · Developer

Related to tools in Validation, derived from the tool metadata.

Related guides & references

Guides and references covering tools in Validation, derived from the tool and content metadata.

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