Privacy-first JSON tools

"Your JSON never leaves the browser":true

Format, diff, convert, and inspect JSON with zero network requests: no backend, no accounts, no uploads. Open DevTools and watch: nothing leaves this page.

Every tool, one workbench

▪Format / Validate

Pretty-print, minify & validate with exact errors

Edit, format & validate JSON online

▪JSON Beautifier

Pretty-print messy or minified JSON

▪JSON Minifier

Compact JSON to one line

Fix broken or truncated JSON

▪JSON Generator

Create mock data from a sample record

▪Compare / Diff

Semantic diff with ignore rules & array identity

▪JSON Validator

Strict RFC 8259 check with exact error location

Lint JSON with precise error locations

▪JSONPath Tester

Evaluate JSONPath queries live

Generate a JSON Schema from a sample

▪Schema Validator

Validate JSON against a schema (Ajv)

Explore JSON as a collapsible tree

▪JSON to Query String

JSON object to URL params

▪Query String to JSON

URL params to a JSON object

▪Form to JSON

HTML form fields to a JSON schema

Recursive, diff-friendly key ordering

Headers to keys, types inferred

Nested JSON flattened to columns

▪JSON to Excel

Download a real .xlsx workbook

Download JSON as a paginated PDF

▪YAML to JSON

Anchors expanded, Norway-proof

▪JSON to YAML

JSON to readable YAML

Attributes, arrays, CDATA handled

JSON to well-formed XML

CREATE TABLE + INSERTs, types inferred

INSERT statements to a JSON array

▪Flatten / Unflatten

Dot-notation paths, both directions

Arrays as a sortable table

Size, depth & structure stats

▪Escape / Unescape

String escaping, both directions

JSON to escaped string literal

▪Strip comments

JSONC / JSON5 to strict JSON

▪JSON to Markdown

Arrays to a GFM table

▪JSON to TypeScript

Generate TypeScript interfaces from a sample

▪JSON to Python

Generate Python dataclasses from a sample

▪JSON to Pydantic

Generate Pydantic models from a sample

Generate a Zod schema from a sample

Generate Go structs from a sample

▪JSON to Java

Generate Java classes from a sample

Generate C# classes from a sample

▪JSON to Rust

Generate Rust serde structs from a sample

▪JSON to Kotlin

Generate Kotlin data classes from a sample

▪JSON to Swift

Generate Swift structs from a sample

▪JSON to Dart

Generate Dart classes from a sample

▪JSON to Ruby

Generate Ruby Dry::Struct types from a sample

Generate clean PHP 8 classes from a sample

Decode tokens locally, never uploaded

Encode / decode, UTF-8 safe