API URL Kit
Group

Developer tools

Utilities for working with APIs, data formats, encoding and the web platform.

Categories

Data & URLs

Extract, clean, parse and build URLs and structured data from API responses.
1 tool

Encoding & Crypto

Encode, decode, hash and inspect tokens — Base64, JWT, hashes and IDs.
3 tools

Formatting & Validation

Pretty-print, minify, convert and validate JSON, YAML, XML, SQL and more.
2 tools

Regex & Patterns

Write, test and understand regular expressions and pattern-matching rules.
1 tool

Web & DevOps

Headers, cron expressions, environment files and everyday operations helpers.
2 tools

All developer tools

API URL Extractor

Unescape, extract, validate, filter and preview URLs from JSON, REST, GraphQL, Postman and Insomnia API responses.

Data & URLs

cURL to Code

Convert a cURL command into fetch, Axios, Python requests, httpx or Go — in your browser.

Web & DevOps

JWT Decoder

Decode JSON Web Token headers and payloads to inspect claims without sending them anywhere.

Encoding & Crypto

OpenAPI Viewer

Preview OpenAPI and Swagger specs as readable docs with sample responses — no Docker, no upload.

Formatting & Validation

Webhook Signature Verifier

Verify Stripe, GitHub, Shopify and Slack webhook HMAC signatures locally in your browser.

Encoding & Crypto

Regex Tester

Test regular expressions against sample text with live match highlighting, capture groups and flags.

Regex & Patterns

JSON Formatter

Pretty-print, minify and validate JSON with clear error messages — all client-side.

Formatting & Validation Soon

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text and data URIs, privately in your browser.

Encoding & Crypto Soon

Cron Expression Generator

Build and read cron expressions in plain English, with the next run times shown.

Web & DevOps Soon