Developer utilities, made local
Developer Tools & Utilities
PureDevUtils is a collection of browser-based developer tools for formatting, validating, encoding, decoding, and converting data — all without uploading your input.
Developer utilities for JSON, JWT, URL, Base64, UUID, CSV, and more
Use the tools directly in your browser for fast, private results. Every tool is designed to keep your data local and reduce unnecessary network exposure.
Popular developer tools
16 availableJSON Formatter
Format and beautify JSON with clear errors and no uploads.
JSON Formatter toolJSON Validator
Check JSON syntax instantly, without sending it anywhere.
JSON Validator toolJSON Minifier
Remove JSON whitespace for smaller, compact payloads.
JSON Minifier toolJSON Diff
Compare two JSON documents and see exactly what changed.
JSON Diff toolJSON to CSV
Convert a JSON array into a downloadable CSV file.
JSON to CSV toolCSV to JSON
Convert header-based CSV data into formatted JSON.
CSV to JSON toolJSON to YAML
Convert JSON into clean, readable YAML.
JSON to YAML toolBase64 Encoder
Encode text as Base64 locally in your browser.
Base64 Encoder toolBase64 Decoder
Decode UTF-8 Base64 text locally in your browser.
Base64 Decoder toolJWT Decoder
Inspect JWT headers and payloads locally, without verifying or uploading tokens.
JWT Decoder toolURL Encoder
Percent-encode URL components locally in your browser.
URL Encoder toolURL Decoder
Decode percent-encoded URL components locally.
URL Decoder toolUUID Generator
Generate cryptographically random UUID version 4 values.
UUID Generator toolJSON to TypeScript
Generate TypeScript interfaces from JSON locally.
JSON to TypeScript toolJSON to Python
Generate Python dataclasses from JSON locally.
JSON to Python toolJSON to Java
Generate Java model classes from JSON locally.
JSON to Java tool