/web

Web and API developer tools

Debug cURL, JWTs, HTTP headers, CSP policies, OpenAPI documents and other web development artifacts locally.

14 browser-only tools · no upload required

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Magic Paste

Paste anything and get routed to the right local tool with confidence signals.

browser-onlyno upload
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cURL Converter

Turn copied cURL commands into fetch, Python requests and structured request JSON.

browser-onlyno upload
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Stack Trace Lens

Parse JavaScript, Python and generic stack traces into actionable frames and issue reports.

browser-onlyno upload
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Workflow Builder

Chain JSON, JWT, Base64, URL, HTML, text and hash operations in one local recipe.

browser-onlyno upload
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JWT Lab

Sign and verify HS256 JWTs locally, with decoded header and payload.

browser-onlyno upload
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HTTP Headers Inspector

Parse response headers and score common security headers.

browser-onlyno upload
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CSP Builder

Build Content-Security-Policy headers with safe defaults.

browser-onlyno upload
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CSS Specificity Calculator

Rank CSS selectors by specificity and understand which rule wins.

browser-onlyno upload
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Cookie Parser & Builder

Parse Cookie headers to JSON and build secure Set-Cookie strings.

browser-onlyno upload
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Meta Tag Generator

Generate title, description, canonical, Open Graph and Twitter meta tags.

browser-onlyno upload
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CSS Clamp Generator

Generate fluid CSS clamp() values for typography and responsive spacing.

browser-onlyno upload
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JWT Decoder

Decode and inspect JWT tokens — header, payload, claims.

browser-onlyno upload
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HAR Viewer

Inspect HAR entries, timings, status codes and slow requests locally.

browser-onlyno upload
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OpenAPI Mini Inspector

List endpoints, methods and response codes from OpenAPI JSON or common YAML locally.

browser-onlyno upload

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