devtoolbox.cc

Fast, private developer tools that run in your browser. No sign-up, no uploads — everything runs on your device.

JSON EditorDataFormat, validate, minify and explore JSON online. Text and tree views, key sorting and search. Runs locally in your browser.
JSON SchemaDataValidate JSON against a JSON Schema (draft 2020-12, 2019-09, 07, 04). Clear error paths, schema checks and format validation, all in your browser.
JSON DiffDataCompare two JSON documents by structure: added, removed and changed fields, key order ignored, smart array matching, JSON Patch export.
JSONPathDataTest JSONPath queries online with live results, matched values or normalized paths, and highlights. Standard RFC 9535 syntax, in your browser.
JSON / YAML / CSVConversionConvert JSON to YAML or CSV and back. Lossless numbers, YAML 1.1-safe quoting, nested fields flattened to columns, Excel-friendly CSV.
Base64EncodingEncode and decode Base64 with full UTF-8 support, URL-safe variant, and file to Base64 / data URI conversion. Nothing leaves your browser.
Image ↔ Base64EncodingConvert images to Base64 data URIs for CSS, HTML and Markdown, or Base64 back to an image with preview and download. PNG, JPEG, WebP, SVG.
JWT DebuggerSecurityDecode JSON Web Tokens, check expiry, verify HS/RS/ES/PS signatures and sign new tokens. Keys and tokens never leave your browser.
Number BaseConversionConvert numbers between binary, octal, decimal, hexadecimal and any base 2–36. Arbitrary precision and two's complement view.
URL EncodeEncodingURL-encode and decode text live in both directions: encodeURIComponent, strict RFC 3986 or full URL, + for spaces, and line-by-line mode.
URL ParserEncodingBreak a URL into protocol, host, port, path and hash, and edit its query string as a table. The URL is rebuilt as you edit.
HashSecurityGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes and HMACs for text or files, in hex or Base64. Computed locally.
UUIDGeneratorsGenerate random v4 and time-ordered v7 UUIDs in bulk, and inspect any UUID for its version, variant and embedded timestamp.
QR CodeGeneratorsCreate QR codes for links, text, Wi-Fi, email, phone and SMS. Custom colours and error correction, PNG and SVG download. No tracking, no expiry.
TimestampConversionConvert Unix timestamps (seconds, ms, µs, ns) to human dates in any time zone and back. ISO 8601, RFC 2822 and relative time.