Codeground AI tools

Free developer tools

JWT debugger, AI code detector, epoch converter, JSON/SQL utilities, and online playgrounds — free, mostly in-browser, no install. Also explore TypeScript playground, Node.js online editor, and Dev Break Arcade.

Quick access to the JWT debugger, AI code detector, epoch converter, and online playgrounds.

JWT DebuggerDecode JWT online — inspect header, payload, exp/iat claims.AI Code DetectorDetect ChatGPT & Copilot code with free local heuristics.Epoch ConverterUnix timestamp ↔ date with IST, PST, GMT, and more.TypeScript PlaygroundFree TypeScript online compiler — tsc + Node, no install.JavaScript / Node PlaygroundNode.js online editor and JavaScript playground in the browser.PostgreSQL PlaygroundOnline PostgreSQL SQL editor — run queries in a sandbox.

Time & dates

Epoch ConverterUnix timestamp ↔ date with timezones.Current Unix TimeLive epoch clock in seconds and ms.Timestamp DiffDifference between two timestamps.Date MathAdd/subtract days, business days, ranges.Timezone Meeting PlannerFind overlapping hours across zones.Cron BuilderBuild and preview cron expressions.

Data & formats

JSON FormatterPretty-print and validate JSON.JSON DiffCompare two JSON documents.JSON ↔ CSVConvert between JSON and CSV.Diff & PatchUnified diffs and patches.Protobuf DecoderDecode base64/hex wire format.Log ParserParse and inspect log lines.Base64 EncodeEncode text to Base64.Base64 DecodeDecode Base64 to text.JWT DebuggerDecode JWT online — header & claims.

SQL

SQL Query GeneratorBuild SELECT/INSERT/UPDATE/DELETE.SQL FormatterPretty-print SQL.SQL AssistantAI help writing SQL.

AI tools

AI Code DetectorDetect ChatGPT & Copilot-generated code.AI Watermark ToolAdd or strip zero-width watermarks.Resume HumanizerDe-AI-ify resume language.AI Email RewriterRewrite emails in your tone.README GeneratorDraft a project README.Text SummarizerCondense long text fast.AI Text GeneratorDraft blogs, emails, and copy.Design CritiqueAI review of system architectures.System Prompt DiffCompare prompts for behavior & risk.AI Code SecuritySecrets, SQLi, SSRF, path traversal.Commit Message GeneratorConventional commits from a diff.Interview Question PackJD → coding, behavioral, design Qs.Schema Seed DataTS/SQL schema → realistic JSON rows.GraphQL ExplainerExplain queries and debug errors.

Utilities

Regex TesterTest regular expressions live.Password GeneratorStrong passwords with entropy.UUID GeneratorBulk RFC-4122 v4 UUIDs.QR GeneratorCreate shareable QR codes.Color PickerHex, RGB, HSL color tools.ENV LinterLint .env files.Lucky Draw WheelSpin a random name picker.Speed TestQuick connection speed check.Diagram StudioDraw architecture diagrams.CanvasFreeform drawing board.

Online playgrounds

Free TypeScript playground, Node.js online editor, Python compiler, and database sandboxes.

TypeScripttsc + Node playgroundJavaScript / NodeOnline JS editorPythonPython 3 online compilerPostgreSQLSQL editor sandboxMongoDBMongo shell onlineMySQLMySQL playgroundRustrustc onlineJavaJDK online compiler