Browser-first JSON toolkit
One suite for every JSON task
Edit, format, validate, repair, compare, query and convert JSON — eight focused tools sharing a single persistent workspace. No backend, no uploads, no tracking.
The toolkit
Pick a tool
Editor
Tree-based JSON editor with syntax highlight, folding and transform.
Format
Pretty-print or compact any JSON document in one click.
Validate
Compile a JSON Schema with Ajv and lint the document against it.
Repair
Fix trailing commas, quoting and other broken JSON syntax.
Compare
Diff two documents side by side with a readable textual report.
Query
Run JSONPath / JMESPath / Lodash queries against any document.
CSV → JSON
Parse CSV rows into structured JSON objects with Papa Parse.
JSON → CSV
Flatten an array of JSON objects into a clean CSV export.
100% local & private
Everything runs in your browser. Your data never leaves the device.
Schema-aware
Validate against JSON Schema, repair broken syntax, query with JSONPath.
Persistent workspace
Buffers persist across tools and reloads — edit in one, use in another.
Ready to work with JSON?
Jump straight into the editor, or open any of the focused tools from the sidebar. Everything runs locally in your browser.
Launch the editor