JSONZen

Free plan APILinuxMacWebWindows

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 require no signup. The toolkit 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, with errors reported 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 keep three snippets locally per browser. Pro adds encrypted cloud-synced snippets, but syncing is manual per snippet and each snippet has a 2 MiB ciphertext limit. The CLI is included free. The listed Free plan costs nothing, billed Forever. Pro is listed at $1.00 USD once for 30 days as a launch promotion, with no auto-charge; the pricing note says paid plans start at $5/mo.

Who it suits

JSONZen suits people who want browser-based tools for editing, checking, querying, and converting JSON without signing up. Users needing more snippet storage or larger share links may consider Pro.

What it does well

Core tools run in the browser
Supports three JSON Schema drafts
Free CLI included
Share-link payloads stay in URL fragments

What to know first

Free share links limited to 32 KB
Free local storage limited to three snippets per browser
Pro snippet syncing is manual per snippet

Limits

Free allows three locally stored snippets per browser and share links up to 32 KB. Pro allows up to 256 KB per share link and has no snippet-count cap, but each encrypted snippet is limited to 2 MiB and syncing is manual per snippet.

Plans

Plan	Billed and limits	Price
Free	Forever · 32 KB share links · 3 locally stored snippets per device · all JSON tools · CLI included	Free
Pro	30 days · launch promo; normal monthly price $5; no auto-charge · 256 KB share payload · unlimited encrypted cloud snippets · password-protected shares · larger-file tree viewer · jq and power tools	$1, paid once

As jsonzen.dev lists them, read 15 Oct 2026. The maker's own page has the final word.

Getting started

Open the JSONZen website in a browser; the core tools require no signup.
Use the browser tools to format, validate, query, compare, or convert JSON.
Install the free CLI with npm i -g jsonzen if you want the command-line tool.
Choose a plan if you need Pro features.
Sign up for the offer of three months of Pro free with no card required.

Verdict

JSONZen covers common JSON tasks in a browser and includes schema validation, query tools, and code generation. Check the snippet and share-link limits, and note the listed Pro promotion alongside the pricing note of $5/mo.

Questions

What does JSONZen cost?

Free is listed as free, billed Forever. Pro is listed at $1.00 USD once for 30 days as a launch promotion with no auto-charge; the pricing note says paid plans start at $5/mo.

Is there a free plan or trial?

Yes. The Free plan is listed as free, billed Forever, and the pricing page also advertises three months of Pro free with no card required for sign-up.

Which platforms can I use?

The tools are available on the web, and the platform facts also list API. The CLI is included free and can be installed with npm i -g jsonzen.

Does JSONZen require an account?

The homepage says the browser tools require no signup. The pricing page advertises three months of Pro free with no card required for sign-up.

What are the Free and Pro snippet limits?

Free supports three locally stored snippets per browser. Pro has no snippet-count cap, but each snippet is limited to 2 MiB of ciphertext; syncing is manual per snippet.

Does JSONZen integrate with jq?

jq query language is listed as a Pro power tool. JSONPath and JMESPath are also listed as query options.

Facts from JSONZen's own pages

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, 30 Sept 2026
CLI: The pricing page lists the CLI as included free and installable with npm i -g jsonzen. · jsonzen.dev, 30 Sept 2026
Client-side processing: The maker says its core tools run entirely in the browser. · jsonzen.dev, 15 Oct 2026
CLI installation: The CLI installs with npm, npx, pnpm or yarn and requires Node 20 or newer. · jsonzen.dev, 15 Oct 2026
CLI licence: Socket's package analysis identifies the jsonzen CLI as MIT licensed. · socket.dev, 15 Oct 2026
CLI offline operation: After installation, the CLI works offline and does not require a network connection. · jsonzen.dev, 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, 15 Oct 2026
CLI portability: The CLI documentation says it runs on Windows, macOS, Linux and WSL wherever Node 20+ runs. · jsonzen.dev, 15 Oct 2026
CLI scripting: CLI exit codes are documented and a --json option emits machine-readable error envelopes to stderr. · jsonzen.dev, 15 Oct 2026
CLI update date: Socket reports the CLI package was last updated on 20 May 2026. · socket.dev, 15 Oct 2026
Code generation: The toolset generates TypeScript, Zod, Pydantic v2 and JSON Schema from JSON samples. · jsonzen.dev, 15 Oct 2026
Formatter: The formatter pretty-prints JSON, reports line-accurate errors and can sort keys. · jsonzen.dev, 15 Oct 2026
Free snippet limit: Free users can store three snippets locally per device. · jsonzen.dev, 15 Oct 2026
Integration: The pricing page says jq query language is available as a Pro power tool. · jsonzen.dev, 30 Sept 2026
Maker contact: The homepage directs feature requests and support inquiries to [email protected]. · jsonzen.dev, 15 Oct 2026
Package adoption: The npm listing reports 13 weekly downloads and one dependent for @jsonzen/core. · npmjs.com, 15 Oct 2026
Package version: The npm listing shows @jsonzen/core version 1.0.0 with three published versions. · npmjs.com, 15 Oct 2026
Privacy positioning: The homepage says there are no uploads, tracking or signup requirements for core tools. · jsonzen.dev, 15 Oct 2026
Pro ciphertext limit: Each Pro ciphertext is capped at 2 MiB, described as roughly 1.5 MB of plaintext. · jsonzen.dev, 15 Oct 2026
Pro encryption: Pro snippets are encrypted in the browser before upload and the server stores opaque ciphertext. · jsonzen.dev, 15 Oct 2026
Pro sync behavior: Cloud synchronization is manual per snippet and is available only on Pro. · jsonzen.dev, 15 Oct 2026
Purpose: JSONZen offers browser tools to format, validate, diff, query, and convert JSON. · jsonzen.dev, 30 Sept 2026
Query languages: JSONZen supports JSONPath and JMESPath queries, while jq is listed as a Pro power feature. · jsonzen.dev, 15 Oct 2026
Remote references limit: Remote HTTP $ref schemas are outside the validator's supported scope; referenced schemas must be pasted inline. · jsonzen.dev, 15 Oct 2026

Where JSONZen stands on Freedom251

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