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jsonfmt.dev

C
C tier on JSON ToolsScore 6.9 · #4 of 29
Android app
Not listed
Free plan
Yes
Runs on
api, Web
jsonfmt.dev
The jsonfmt.dev homepage
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Summary

jsonfmt.dev is an online JSON formatter, beautifier, and validator with browser-based tools and an HTTPS API. Formatting options include 2-space, 4-space, or tab indentation, key sorting, and depth control. It checks JSON against RFC 8259 and reports line and column errors; other tools repair common malformed JSON, compare documents, and convert formats such as YAML, CSV, XML, TypeScript, SQL, GraphQL, and Protobuf. The toolkit also includes JSON Schema validation, JSONPath evaluation, JWT decoding, and JSONL tools. The maker says the core web tool processes JSON in the browser without sending JSON content to its servers, works offline after loading, and can be installed as a Progressive Web App. Anonymous API use is limited to 10 requests per minute; a free API key permits 100 per minute and 1,000 per month. Pro API access costs $9.00 USD once, with 1,000 requests per minute and 50,000 per month. Share links encode JSON in the URL fragment, and anyone with a link can access its contents.

Who it is for

jsonfmt.dev suits people who need to format, validate, repair, compare, or convert JSON in a browser or through an API. API users can choose anonymous access, a free key, or a one-time Pro payment based on their request needs.

What is good

  • Multiple indentation and key-sorting options
  • Reports validation errors by line and column
  • Includes repair, diff, and conversion tools
  • Core browser tool processes JSON locally
  • Free API key tier includes 1,000 requests monthly

What to know first

  • Anonymous API access is limited to 10 requests per minute
  • Free API key tier has a 1,000-request monthly limit
  • Share-link contents are accessible to anyone with the link
  • Site uses Google Analytics and Google AdSense

Verdict

jsonfmt.dev combines browser JSON tools with an API and multiple free access options. Consider API limits and the access implications of share links before using it for a workflow.

jsonfmt.dev plans and pricing

All plans
Free API key Free With API key 100 requests/minute · all endpoints · 1,000 requests/month · email support api.jsonfmt.dev · 2 Oct 2026
Anonymous API Free No sign-up required 10 requests/minute · all endpoints · no monthly limit · community support api.jsonfmt.dev · 2 Oct 2026
Pro API $9 once Pay once, Pro forever 1,000 requests/minute · all endpoints · 50,000 requests/month · priority support api.jsonfmt.dev · 2 Oct 2026

Compared on JSON tools

Free plan
Yesjsonfmt.dev
Schema validation
Yesjsonfmt.dev
JSONPath querying
Yesjsonfmt.dev
jq querying
Nojsonfmt.dev
Batch processing
Yesjsonfmt.dev
JSON diff and compare
Yesjsonfmt.dev
Available platforms
Web, API, chrome_extensionjsonfmt.dev

Facts

Product
jsonfmt.dev describes itself as a free online JSON formatter, beautifier, and validator.jsonfmt.dev · 2 Oct 2026
Formatting
The formatter supports 2-space, 4-space, or tab indentation, optional key sorting, and depth control.jsonfmt.dev · 2 Oct 2026
Validation
The site says it validates JSON against RFC 8259 and reports precise line and column errors.jsonfmt.dev · 2 Oct 2026
Repair and diff
Its tools can repair common malformed JSON and compare two documents, highlighting added, removed, and changed fields.jsonfmt.dev · 2 Oct 2026
Conversion
The site lists converters for formats including YAML, CSV, XML, TypeScript, SQL, GraphQL, and Protobuf.jsonfmt.dev · 2 Oct 2026
Other tools
The web toolkit also includes a JWT decoder, JSON Schema validator, JSONPath evaluator, and JSONL tools.jsonfmt.dev · 2 Oct 2026
Offline use
The site says it works offline after loading and can be installed as a Progressive Web App.jsonfmt.dev · 2 Oct 2026
Privacy
The maker says the core web tool processes JSON locally in the browser and does not send JSON content to its servers.jsonfmt.dev · 2 Oct 2026
Share links
Share links encode JSON in the URL fragment, which the policy says is not sent in HTTP requests; anyone with the link can access its contents.jsonfmt.dev · 2 Oct 2026
Analytics and ads
The privacy policy says the site uses Google Analytics and Google AdSense, which may use cookies; it also says local tool preferences and session data are kept in browser localStorage.jsonfmt.dev · 2 Oct 2026
API access
The API accepts JSON over HTTPS and offers formatting, minifying, validation, repair, diffing, conversion, and other endpoints.api.jsonfmt.dev · 2 Oct 2026
API limit
Unauthenticated API use is limited to 10 requests per minute; the documentation lists a free API-key tier at 100 requests per minute and 1,000 requests per month.api.jsonfmt.dev · 2 Oct 2026
Integrations
The maker describes an MCP server package, jsonfmt-mcp, that exposes JSON-processing tools to MCP-compatible AI clients.jsonfmt.dev · 2 Oct 2026
Support
The API pricing lists community support for anonymous access, email support for the free key tier, and priority support for Pro.api.jsonfmt.dev · 2 Oct 2026

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