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FizzKit

JSON Tools

11

Everything you need for working with JSON in the browser: a formatter with tree view, a validator with JSON Schema support, converters to and from YAML, CSV, XML and TOML, a structural diff, and a path finder for dot, bracket, JSONPath and jq syntax. Every tool runs locally — large documents never leave your machine.

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JSON Formatter

Beautify, minify, sort, query and repair JSON with a tree view and copy-as code export.

jsondeveloper

JSON Validator

Validate JSON syntax and JSON Schema, catch duplicate keys and precision loss, check NDJSON line by line.

jsondeveloper

JSON Diff

Compare two JSON documents side by side, ignore keys, match arrays by id and export JSON Patch or Merge Patch.

jsondeveloper

JSON to YAML

Convert JSON into clean YAML with control over quoting, wrapping, anchors and multi-document output.

jsonconverters

All json tools

JSON Minifier

Minify JSON, strip nulls, measure gzip size and encode as Base64 or URL-safe text.

jsondeveloper

YAML to JSON

Convert YAML into strict JSON, with multi-document streams, YAML-only types and duplicate keys handled.

jsonconverters

JSON to CSV

Flatten JSON arrays into CSV with a table preview, column picker, nested-path selection and Excel options.

jsonconverters

CSV to JSON

Parse CSV into JSON objects, arrays, columns or NDJSON with a table preview and type inference that keeps IDs intact.

jsonconverters

XML to JSON

Convert XML to JSON and JSON back to XML, with attribute, text-node, namespace and array controls.

jsonconverters

TOML to JSON

Convert TOML config to JSON and JSON back to TOML, with Cargo, pyproject and netlify presets.

jsonconverters

JSON Path Finder

Explore JSON as a tree, click any value to copy its path in 7 syntaxes, and evaluate JSONPath or jq queries.

jsondeveloper

Frequently asked questions

No hard limit — the tools are tuned for multi-megabyte documents (line numbers and highlighting scale back automatically above ~200 KB so the page stays responsive).