jsonfmt.dev

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

jsonfmt.dev is ranked #1 of 29 in JSON tools on Inferse. It runs on API, Web. There is a free plan.

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