Catch the OAuth, OIDC, JWT, MCP, session, and CORS anti-patterns that AI coding tools produce, right in your editor. oauthlint flags risky auth code as you save, links every finding to its explanation, and (when a finding ships a safe rewrite) offers a one-click fix.

Available on the VS Code Marketplace and on Open VSX for Cursor, Windsurf, and other VS Code-compatible editors.

In the editor

OAuthLint flagging a JWT that accepts the none algorithm, inline in VS Code

Every finding explains itself. Hover any finding for a plain-English reason it is dangerous, its rule id, and the mapped CWE, with a jump to the problem or a fix.

Hover on a finding showing the rule id, the why, the CWE, and the fix

Severity, right where you work. Findings surface as native diagnostics, squiggles in the editor and rows in the Problems panel, with severity mapped to errors and warnings.

OAuthLint findings as squiggles and Problems panel rows, colour-coded by severity

Fix it without leaving the line. When a finding ships a safe rewrite, the lightbulb applies it in place, suppresses the line with an auditable comment, or opens the rule's docs.

Quick Fix menu offering apply fix, suppress line, and open documentation

Zero setup, runs offline. The rule pack ships inside the extension and the engine is fetched once and verified. No CLI, no Python. Tune severity and you are done.

OAuthLint settings in VS Code, showing the four zero-config options

What it does

Inline diagnostics on save and on open, for all eleven supported languages (JavaScript, TypeScript, Python, Go, C#, and more) plus mobile auth (Swift/iOS, Android). Severity maps to the editor's usual squiggles, so a CRITICAL finding reads as an error and a LOW one as information.
Rule id and docs link on every finding. Each diagnostic carries its rule id (for example auth.jwt.no-verification) and a link straight to that rule's page on oauthlint.dev. A hover adds the full message (the why and the fix) and any CWE the rule references.
Quick Fix: apply the fix. When a finding carries an autofix, the lightbulb offers Apply OAuthLint fix for <rule-id> as the preferred action. It rewrites just the offending span in place, the same deterministic replacement the CLI's --fix applies, without re-running the scan or touching the rest of the file. Findings without a fix don't show this action.
Quick Fix: suppress a line. Suppress <rule-id> on this line inserts an // oauthlint-disable-next-line <rule-id> directive above the finding, the same auditable comment the CLI honours, for the cases you've reviewed and accepted.
Quick Fix: open documentation. Open documentation for <rule-id> opens the rule's page in your browser.
Status bar item showing the OAuthLint finding count for the active file ($(shield) OAuthLint: 3). It spins while a scan is running ($(sync~spin) OAuthLint: scanning…), turns into a $(warning) warning when a scan can't run (with a tooltip pointing at the OAuthLint output channel), and re-scans the current file when clicked. It hides for non-JS/TS files.

The OAuthLint engine and rule pack ship inside the extension, so scans run in-process and render as native VS Code diagnostics. There is no oauthlint CLI to install.

Requirements

Nothing to install and no config. The rule pack ships inside the extension, and a small pinned scan engine is downloaded automatically the first time you scan. That is a one-time download of about 41 MB, verified against a pinned checksum, then cached and reused. There is no separate CLI to install. If you already have opengrep or semgrep on your machine, point oauthlint.enginePath at it to skip the download.

Settings

Setting	Default	Description
`oauthlint.enabled`	`true`	Scan on save and on open
`oauthlint.minSeverity`	`MEDIUM`	Only surface findings at this severity or above
`oauthlint.rulesDir`	empty	Override the rules directory (empty = the rule pack bundled with the extension)
`oauthlint.enginePath`	empty	Path to an existing opengrep/semgrep binary (empty = download and manage Opengrep automatically)

Commands

oauthlint: Scan current file
oauthlint: Scan workspace
oauthlint: Open rule documentation
oauthlint: Retry scan engine setup

The editor integration scans every language OAuthLint supports. The full oauthlint rule pack covers 270+ rules across eleven languages (JavaScript, TypeScript, Python, Go, C#, and more) plus mobile auth (Swift/iOS, Android), including a dedicated MCP server-auth pack (token pass-through, RFC 8707 audience binding, unauthenticated transports, tool-handler SSRF) and dataflow (taint) rules for open-redirect and SSRF, and runs from the CLI and GitHub Action.