Dev Toolkit — by freetoolspot

Extension Tools

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Overview

Developer text utilities: format JSON, decode JWT, encode Base64/URL, test regex — fully offline in your browser.

A focused set of text utilities for developers, all running entirely in your browser. Includes: • JSON Formatter — prettify, minify, and validate JSON. Pick 2-space, 4-space, or tab indentation. Live error messages. • Base64 Encode / Decode — UTF-8 safe, two-way text ↔ Base64. • URL Encode / Decode — percent-encode strings for query parameters and URL components. • JWT Decoder — decode the header and payload of a JSON Web Token. Signature is shown but not verified (verification requires the secret key). • Regex Tester — live JavaScript regex matching with highlighted matches and configurable flags. Privacy: 100% client-side. No data is collected, transmitted, or logged. The extension requests zero permissions and works fully offline. Part of the freetoolspot.com toolkit — visit the site for 30+ more browser-based utilities (CSV viewer, color tools, hash, password generator, and more).

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Details

Version
1.0.0
Updated
April 27, 2026
Flag concern
Offered by
jinhoparkseoul
Size
24.23KiB
Languages
English
Developer
Email
admin@freetoolspot.com
Non-trader
This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

DevTools Pro

0.0

Format JSON, Render HTML, JWE/RSA/AES/Bcrypt Crypto Tools — all in one sleek developer toolkit.

API Probe

5.0

Test REST APIs directly from your browser

JWT Token Decode

5.0

With JWT Token Decode: automatically inspect JWTs from web requests & manually decode JSON tokens. Quick, easy online token decoder.

JWT Decoder, Base64 & URL Encode/Decode, JSON Formatter, Hash Generator

5.0

Decode JWT, Base64 & URL offline — 100% local processing. JSON format/minify, SHA-256/MD5 hashes, history, right-click menu.

RegexPal

0.0

Regex tester in your browser. Write regex, paste test text, see matches highlighted instantly.

Dev Tools - Web Dev Tools Suite

5.0

Essential web dev tools: code formatter, minifier, base64 encoder, regex, color picker, JSON syntax validator, QR generator & more.

Dev Tools

0.0

Integrated developer tool suite: JSON/XML formatting, text encryption/decryption, Base64 encoding/decoding, encoding conversion

URL Decoder, JSON Formatter && Unicode Decoder

4.0

Decode selected text using URL decode, format JSON string , and decode Unicode string within the current web page.

Code Formatter - JSON, CSS & JavaScript

3.9

Code Formatter – all-in-one extension offering sophisticated syntax highlighting for CSS, JSON, and JavaScript.

Text Toolkit Pro - All Text Operations (Fast & Easy)

5.0

All text operations: case conversion, encoding, hashing, JSON, analysis, time conversion & more. Fast & easy toolkit.

QAKit Toolbox

5.0

Offline toolbox for developers & QA: JSON, YAML, JWT, regex, hashes, passwords, color picker, screenshots and more.

Base64Coder: Encode, Decode & JWT Inspector

5.0

Base64 encoder/decoder, JWT inspector & image-to-base64 converter for developers.