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JSONZen
What it is
JSONZen is a browser toolkit for formatting, validating, minifying, comparing, querying, and converting JSON. Its core tools run in the browser and require no signup. The toolset also includes a tree view, JWT decoding, and code generation for TypeScript, Zod, Pydantic v2, and JSON Schema. The validator supports JSON Schema drafts 07, 2019-09, and 2020-12, and reports errors by path. Queries can use JSONPath and JMESPath; jq querying is listed as a Pro power tool. Share links place their payload in the URL fragment rather than on JSONZen's servers, with limits of 32 KB on Free and 256 KB on Pro. Free users can store three snippets locally per browser. Pro offers encrypted cloud-synced snippets, but syncing is manual per snippet, and each snippet has a 2 MiB ciphertext limit. The CLI is included free and can be installed with npm i -g jsonzen. Free is listed as free, billed Forever. Pro is listed at $$1 once for 30 days as a launch promotion, with no auto-charge; the pricing note says paid plans start at $5/mo.
For and against
For
- Core tools run in the browser without signup.
- Validates multiple JSON Schema drafts.
- Includes JSONPath and JMESPath queries.
- Free CLI is available.
- Share-link payloads are kept in URL fragments.
Against
- Free users can store three snippets per browser.
- Free share links are limited to 32 KB.
- Pro syncing is manual per snippet.
- Pro snippets have a 2 MiB ciphertext limit.
The verdict
JSONZen brings a broad set of JSON tools into the browser, with no signup required for core tools. Free storage and share sizes are limited; Pro raises the share-link cap and adds encrypted snippets with manual syncing.
Who it suits
JSONZen suits developers who need browser-based tools for inspecting, transforming, or querying JSON. Its free local snippet storage and share links may fit occasional work, while Pro adds encrypted cloud-synced snippets and larger share links.
Plans and prices
Free
32 KB share links · 3 locally stored snippets per device · all JSON tools · CLI included
Read 15 Oct 2026 · jsonzen.dev
Pro
256 KB share payload · unlimited encrypted cloud snippets · password-protected shares · larger-file tree viewer
Read 15 Oct 2026 · jsonzen.dev
On the record
- Account and signup
- The homepage says the browser tools require no signup, and the pricing page advertises three months of Pro free with no card required for sign-up.jsonzen.dev · read 30 Sep 2026
- CLI
- The pricing page lists the CLI as included free and installable with npm i -g jsonzen.jsonzen.dev · read 30 Sep 2026
- Client-side processing
- The maker says its core tools run entirely in the browser.jsonzen.dev · read 15 Oct 2026
- CLI installation
- The CLI installs with npm, npx, pnpm or yarn and requires Node 20 or newer.jsonzen.dev · read 15 Oct 2026
- CLI licence
- Socket's package analysis identifies the jsonzen CLI as MIT licensed.socket.dev · read 15 Oct 2026
- CLI offline operation
- After installation, the CLI works offline and does not require a network connection.jsonzen.dev · read 15 Oct 2026
- CLI package activity
- Socket reports the jsonzen CLI package version 1.0.0, one maintainer and about nine weekly downloads.socket.dev · read 15 Oct 2026
- CLI portability
- The CLI documentation says it runs on Windows, macOS, Linux and WSL wherever Node 20+ runs.jsonzen.dev · read 15 Oct 2026
- CLI scripting
- CLI exit codes are documented and a --json option emits machine-readable error envelopes to stderr.jsonzen.dev · read 15 Oct 2026
- CLI update date
- Socket reports the CLI package was last updated on 20 May 2026.socket.dev · read 15 Oct 2026
- Code generation
- The toolset generates TypeScript, Zod, Pydantic v2 and JSON Schema from JSON samples.jsonzen.dev · read 15 Oct 2026
- Formatter
- The formatter pretty-prints JSON, reports line-accurate errors and can sort keys.jsonzen.dev · read 15 Oct 2026
- Free snippet limit
- Free users can store three snippets locally per device.jsonzen.dev · read 15 Oct 2026
- Integration
- The pricing page says jq query language is available as a Pro power tool.jsonzen.dev · read 30 Sep 2026
- Maker contact
- The homepage directs feature requests and support inquiries to [email protected].jsonzen.dev · read 15 Oct 2026
- Package adoption
- The npm listing reports 13 weekly downloads and one dependent for @jsonzen/core.npmjs.com · read 15 Oct 2026
- Package version
- The npm listing shows @jsonzen/core version 1.0.0 with three published versions.npmjs.com · read 15 Oct 2026
- Privacy positioning
- The homepage says there are no uploads, tracking or signup requirements for core tools.jsonzen.dev · read 15 Oct 2026
