Privacy-first API toolbox

Developer tools that keep your data yours.

Format, decode, convert, and inspect API data without uploads, accounts, or tracking. Everything runs locally in your browser.

Explore tools How privacy works

$ localapi format data.json

{
  "processed": "locally",
  "uploaded": false,
  "tracking": false,
  "ready": true
}

Runs in your browser

Nothing is stored

No signup required

The toolbox

Ten focused utilities

Purpose-built for backend and API work, with a small footprint and a strict local-processing model.

JSON FormatterFormat, validate, and minify JSON without sending it anywhere.Data JSONPath TesterTest RFC 9535 JSONPath expressions against local JSON documents.Data JWT DecoderInspect JWT headers, payloads, and time-based claims locally.Security Unix Timestamp ConverterConvert timestamps to readable dates and back.Time & IDs UUID GeneratorGenerate cryptographically secure UUID v4 values.Time & IDs Cron Expression ParserUnderstand cron fields and preview upcoming run times.Developer Utilities Base64 Encoder / DecoderEncode and decode UTF-8 text in standard or URL-safe Base64.Encoding URL Encoder / Query ParserEncode URL components and inspect query parameters.Encoding Hash / HMAC GeneratorCreate SHA digests and HMAC values with Web Crypto.Security YAML ↔ JSON ConverterConvert safely between YAML 1.2 and JSON.Data

Private by architecture, not by promise.

Your input stays in the current tab and disappears when you close it.

Learn about the project