Alternatives to JSONLint
An online JSON validator and formatter that tidies and checks pasted or fetched JSON. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
JSONLint
An online JSON validator and formatter that tidies and checks pasted or fetched JSON.
Replacements
Listings that take over the same core job as JSONLint.
JSON Schema Validator
An online tool that validates a JSON document against a JSON Schema you paste in.
JSON Schema Validator checks JSON against a pasted schema from draft 3 to 2020-12, but validation runs on its server and it does not format output.
DevToys
Keep common developer utilities in one desktop application.
DevToys bundles formatters and validation tools in an open source desktop app for Windows, macOS and Linux, so JSON can be checked offline alongside other utilities.
IT Tools
Open-source collection of handy encoder, converter and generator utilities.
IT Tools is an open source collection of converters and formatters that can be self-hosted for privacy, though each tool is simpler than a dedicated app.
Also worth comparing
These listings name JSONLint as their own alternative, so the relationship runs both ways.
JSON Formatter
An open-source Chrome extension that pretty-prints and syntax-highlights raw JSON responses opened in the browser.
JSONLint is a website instead of a Chrome extension, so you paste JSON or give a URL to format and validate it, with clear syntax error reporting.
Similar software
Related functionality, not a direct replacement.
YAMLlint
An online YAML validator that checks pasted YAML and returns a clean UTF-8 version.
XMLValidation.com
A free online tool that checks XML documents for syntax errors and validates them against DTDs or XML schemas.
CyberChef
Transform, decode and inspect data with recipes in a browser.
gron
A command-line tool that flattens JSON into discrete assignments so it can be searched with grep.
jo
A small command-line utility that builds JSON objects and arrays from shell arguments.
fq
Queries binary file formats with jq syntax and a structural hex viewer.
