Tool library

Free JSON tools for everyday API work

Format, convert, query, validate, compare, and transform data in the same browser-first workspace as the editor.

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28 browser-first tools

Format

Format and validate JSON with syntax highlighting

Sort JSON keys alphabetically or arrays by field

Query

Query JSON data using SQL with DuckDB

Query Playground

Query JSON with JSONPath, JQ, or JSONata

Utilities

Compare and merge two JSON documents side by side

Flatten / Unflatten

Flatten nested JSON to dot notation or unflatten back

View and edit JSON as a spreadsheet grid

Encode and decode Base64 strings

Generate TypeScript, Go, Kotlin, Rust types from JSON

Schema Validator

Validate JSON against a JSON Schema

JSON Path Finder

Click any value to get its JSONPath, JQ, or JSONata expression

Mock Data Generator

Generate realistic sample data from a JSON structure

JSON File Viewer

View large JSON files with pagination and per-page validation

JSON Escape / Unescape

Escape or unescape JSON string literals

JSON Merge Patch

Merge two JSON documents using RFC 7396

Decode JWT tokens to inspect header, payload, and expiry

Convert

Convert JSON to YAML format

Convert YAML to JSON format

Convert JSON to XML format

Convert XML to JSON format

Convert JSON arrays to CSV

Convert CSV to JSON array

Convert YAML to XML

Convert XML to YAML

Convert YAML to CSV

Convert CSV to YAML

Convert XML to CSV

Convert CSV to XML