Is my data uploaded to any server when converting JSON?

No. JSON Studio Pro is 100% client-side. All processing, formatting, and conversion happens entirely within your web browser, and nothing is transmitted to a remote server.

Is JSON Studio Pro free to use?

Yes. JSON Studio Pro is completely free, open source under the MIT license, requires no account or sign-up, and has no usage limits.

What developer tools and formats are supported?

JSON Studio Pro supports JSON, XML, CSV, TSV, YAML, TOML, SQL DDL/INSERT, Markdown, HTML, TypeScript, Python, PHP, NDJSON, jq queries, JSON Diff, JSON Patch, OpenAPI specs, and JWT decoding.

How does the JSON Auto-Repair feature work?

The auto-repair engine parses malformed JSON and automatically corrects unquoted keys, single quotes, trailing commas, comments, and non-standard boolean values such as Python's True, False and None.

Can I use JSON Studio Pro offline?

Yes. JSON Studio Pro is an installable Progressive Web App. After the first visit a service worker caches the application shell, so every tool keeps working with no internet connection.

How large a JSON file can I format?

Processing runs locally, so the practical limit is your device's available memory rather than an upload quota. Multi-megabyte payloads format in milliseconds on a typical laptop.

Can I convert JSON to SQL INSERT statements?

Yes. The built-in SQL Studio generates CREATE TABLE DDL and batch INSERT statements for PostgreSQL, MySQL, SQLite, Oracle, MS SQL Server and BigQuery, and can also convert SQL back into JSON.

JSON Studio Pro — Free JSON Formatter, Repair & Converter

JSON Studio Pro is a free, 100% client-side developer studio for formatting, validating, repairing and converting JSON. Every operation runs inside your browser — no payload is ever uploaded to a server. JavaScript must be enabled to use the application.

Developer studios

SQL Studio — CREATE TABLE DDL and batch INSERT generation for PostgreSQL, MySQL, SQLite, Oracle, MS SQL and BigQuery
Side-by-side JSON diff and comparator with delta highlighting
jq query playground, JSONPath evaluator and PII masking
RFC 6902 JSON Patch and RFC 7386 Merge Patch
OpenAPI 3.0, cURL and GraphQL spec generators
JWT inspector, ER diagram, object graph and payload profiler
Code model generation for TypeScript, Python, Go, Rust, C#, Swift and Dart

Supported conversions

JSON ⇄ XML, CSV, TSV, YAML, TOML, SQL, Markdown, HTML, NDJSON, URL query strings and .env / Java properties, plus JSON → TypeScript interfaces, Python dicts and PHP arrays.

Frequently asked questions

Is my data uploaded to any server?

No. All parsing, formatting, repair and conversion happens locally in your browser.

Is it free?

Yes — free, open source under the MIT license, with no account and no usage limits.

Does it work offline?

Yes. JSON Studio Pro is an installable PWA that keeps working with no connection after the first visit.