As developers, we constantly work with JSON — API responses, config files, logs, payloads, and data transformations.

I recently built a small project called jsondevtools.org to make common JSON-related tasks faster and easier.

Why I Built It

While debugging APIs and backend services, I found myself repeatedly searching for tools to:

Format JSON

Validate broken payloads

Decode JWT tokens

Convert JSON to YAML or CSV

Minify large responses

Most existing tools were:

overloaded with ads

slow

cluttered

or missing useful developer-focused features

So I decided to build a lightweight alternative focused on:

speed

simplicity

clean UI

privacy

Current Features

JSON Formatter & Validator

Pretty-print and validate JSON instantly.

JWT Decoder

Decode JWT payloads directly in the browser.

JSON ↔ YAML Converter

Convert between JSON and YAML formats.

JSON Minifier

Reduce payload size quickly.

Developer-Friendly UI

Dark mode

Mobile responsive

Fast client-side processing

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