JSONZen
JSONZen is a browser-based toolkit for formatting, validating, minifying, comparing, querying, and converting JSON.
What JSONZen is
JSONZen is a browser-based toolkit for formatting, validating, minifying, comparing, querying, and converting JSON. Its core tools run in the browser, and the site says they require no signup. Other tools include 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 tool. Share links place their payload in the URL fragment rather than on JSONZen’s servers, with limits of 32 KB for Free and 256 KB for Pro. Free users can store three snippets locally per browser. Pro offers encrypted cloud-synced snippets, synced manually one at a time, with a 2 MiB ciphertext limit per snippet. The CLI is included free and can be installed with npm i -g jsonzen. Free is listed as free, billed Forever.
Good
- Core tools run in the browser.
- No signup is required for browser tools.
- Supports JSONPath and JMESPath queries.
- Free CLI is available.
- Free plan includes three locally stored snippets per browser.
Watch out
- Free share links are limited to 32 KB.
- Free users can store only three snippets per browser.
- Pro snippet syncing is manual per snippet.
- Pro snippet ciphertext is limited to 2 MiB each.
Who it suits
JSONZen suits people who want browser tools for common JSON tasks without signing up. Its Free plan fits light local snippet storage, while Pro adds cloud-synced snippets and larger share links.
Verdict
JSONZen brings a broad set of JSON tools into the browser, with a free CLI and client-side core tools. Consider the snippet and share-link limits alongside the listed Pro terms.
Plans and prices
From JSONZen's own pricing page, checked 15 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 32 KB share links · 3 locally stored snippets per device · all JSON tools · CLI included · Forever |
| Pro | $1, paid once | 256 KB share payload · unlimited encrypted cloud snippets · password-protected shares · larger-file tree viewer · jq and power tools · 30 days · launch promo; normal monthly price $5; no auto-charge |
The facts
Each one read from JSONZen's own pages, with the date it was checked.
What it does
- 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.checked 30 Sep 2026
- CLI
- The pricing page lists the CLI as included free and installable with npm i -g jsonzen.checked 30 Sep 2026
- Client-side processing
- The maker says its core tools run entirely in the browser.checked 15 Oct 2026
- CLI installation
- The CLI installs with npm, npx, pnpm or yarn and requires Node 20 or newer.checked 15 Oct 2026
- CLI licence
- Socket's package analysis identifies the jsonzen CLI as MIT licensed.checked 15 Oct 2026
- CLI offline operation
- After installation, the CLI works offline and does not require a network connection.checked 15 Oct 2026
- CLI package activity
- Socket reports the jsonzen CLI package version 1.0.0, one maintainer and about nine weekly downloads.checked 15 Oct 2026
- CLI portability
- The CLI documentation says it runs on Windows, macOS, Linux and WSL wherever Node 20+ runs.checked 15 Oct 2026
- CLI scripting
- CLI exit codes are documented and a --json option emits machine-readable error envelopes to stderr.checked 15 Oct 2026
- CLI update date
- Socket reports the CLI package was last updated on 20 May 2026.checked 15 Oct 2026
- Code generation
- The toolset generates TypeScript, Zod, Pydantic v2 and JSON Schema from JSON samples.checked 15 Oct 2026
- Formatter
- The formatter pretty-prints JSON, reports line-accurate errors and can sort keys.checked 15 Oct 2026
- Integration
- The pricing page says jq query language is available as a Pro power tool.checked 30 Sep 2026
- Package adoption
- The npm listing reports 13 weekly downloads and one dependent for @jsonzen/core.checked 15 Oct 2026
- Package version
- The npm listing shows @jsonzen/core version 1.0.0 with three published versions.checked 15 Oct 2026
- Privacy positioning
- The homepage says there are no uploads, tracking or signup requirements for core tools.checked 15 Oct 2026
- Pro ciphertext limit
- Each Pro ciphertext is capped at 2 MiB, described as roughly 1.5 MB of plaintext.checked 15 Oct 2026
- Pro encryption
- Pro snippets are encrypted in the browser before upload and the server stores opaque ciphertext.checked 15 Oct 2026
- Pro sync behavior
- Cloud synchronization is manual per snippet and is available only on Pro.checked 15 Oct 2026
- Purpose
- JSONZen offers browser tools to format, validate, diff, query, and convert JSON.checked 30 Sep 2026
- Query languages
- JSONZen supports JSONPath and JMESPath queries, while jq is listed as a Pro power feature.checked 15 Oct 2026
- Remote references limit
- Remote HTTP $ref schemas are outside the validator's supported scope; referenced schemas must be pasted inline.checked 15 Oct 2026
Money
- Free snippet limit
- Free users can store three snippets locally per device.checked 15 Oct 2026
The company
- Maker contact
- The homepage directs feature requests and support inquiries to [email protected].checked 15 Oct 2026
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