Developer tools that respect your data.

Every tool here runs entirely in your browser. Nothing is uploaded, nothing is logged, nothing is stored. Paste something, get an answer, close the tab.

JSON

{ }

JSON Formatter & Beautifier

Format, beautify and pretty-print JSON

±

JSON Diff

Compare two JSON documents

↔

JSON Converter

Convert JSON to YAML, XML, or CSV

✓

JSON Validator

Check if JSON is valid

▤

JSON Viewer

Explore JSON in a collapsible tree

⚕

JSON Repair

Fix malformed JSON automatically

Generate

HTTP

JSON to HTTP Request

Generate Fetch, Axios, Python, or Go requests

TS

JSON Schema to Validator

Generate Zod, Valibot, or TypeBox validators

ts

JSON to TypeScript

Generate TypeScript interfaces from JSON

go

JSON to Go

Generate Go structs from JSON

py

JSON to Python

Generate Python dataclasses from JSON

{}

JSON to JSON Schema

Generate a JSON Schema from JSON

#

JSON to C#

Generate C# classes from JSON

java

JSON to Java

Generate Java POJOs from JSON

{}

JSON Schema to Sample JSON

Generate sample JSON from a schema

Auth & Encoding

64

Base64 Encoder / Decoder

Encode or decode Base64

jwt

JWT Decoder

Decode JWT header and payload

jwt

JWT Generator

Create signed JWT tokens locally

SQL

sql

SQL Formatter

Format and beautify SQL queries

sql

JSON to SQL INSERT

Generate SQL INSERT statements from JSON

Time & Identity

t↔d

Unix Timestamp Converter

Convert unix time to date and back

id

UUID Generator (v4)

Generate random UUID v4 values

Why DevFormat

Private by design.Every tool runs client-side. What you paste never touches a server, ours or anyone else's.
Errors you can act on.The JSON tools point to the exact line and column, plus a plain-English reason — not a stack trace.
Free, fast, no account.Nothing to sign up for. Hit ⌘K, pick a tool, get on with your day.