Free online JSON tools — private by design
Nine developer tools that run entirely in your browser. Your JSON never leaves your machine — no uploads, no accounts, no limits. Convert, inspect, validate.
JSON to SQL
Convert JSON arrays into INSERT statements and CREATE TABLE DDL
JSON to Java
Generate Java POJOs or records from JSON, with Jackson or Gson annotations
JSON to C#
Generate C# classes or records from JSON for System.Text.Json or Newtonsoft
JSON to TypeScript
Generate TypeScript interfaces or types from JSON, with optional/nullable accuracy
JSON to JSONL
Convert between JSON arrays and newline-delimited JSON (JSON Lines / NDJSON)
JSONL Viewer
Inspect JSONL/NDJSON files with per-line validation — nothing is uploaded
JSON Schema Generator
Infer a JSON Schema (draft 2020-12 or draft-07) from sample JSON
JSON Schema Validator
Validate JSON data against a JSON Schema and see precise error paths
JSON Escape / Unescape
Escape text for embedding in JSON strings, and unescape back