Generated fast. Verified before ship.

Paste an artifact your assistant produced. DevTools works out what it is and hands it to a deterministic verifier that catches the almost-right output before it reaches production. Detection and verification both run in your browser — nothing is uploaded.

Try:

Or choose a verifier

What each verifier proves

Every check below is deterministic: it either holds or it does not. Anything inferred rather than proven is labelled HEURISTIC in the results.

JSON: Shape drift against the response you expected — missing keys, type mismatches, null surprises.
JWT: Expiry, not-before, alg:none, issuer and audience mismatches, and HMAC signatures when you supply the secret.
Cron: The next eight runs in a named timezone, daylight-saving gaps and repeated hours.
Unified diff: File and hunk structure, plus clearly-labelled review suggestions for changed conditionals and removed guards.
URL: Double encoding, duplicate parameters, credentials in the authority, and redirect_uri mismatches.
YAML: Duplicate keys, tab indentation, the Norway problem, and constructs that do not survive JSON conversion.
SQL: Clause outline, table and alias map, DELETE/UPDATE without WHERE, and joins with no condition.
CSV: Ragged rows, duplicate headers, BOM bytes, delimiter detection and inferred column types.
.env: Keys the example declares but your local file lacks, duplicates, and credentials committed to .env.example.
Regex: Labelled test cases with false positives and false negatives called out by name.
Timestamps: Every timestamp in a log line, rendered in the timezone you choose.

What it does not do

It does not call a language model. Detection and every verifier are pure functions over your input.
It does not prove your code is correct. A patch that parses cleanly can still be wrong.
It does not execute anything. SQL is read, never run; cURL commands are parsed, never shelled out.
It does not put credentials in a share link. Secret fields are excluded from every URL, on every path.

Read more in the verification workflow docs, or see how local processing works.