JSON Formatter and Validator
Format, minify, and validate JSON snippets for APIs, configuration, and documentation.
JSON Formatter and Validator
Format, minify, and validate JSON before using it in code, APIs, or documentation.
Paste JSON and choose an action.
Result
Your result will appear here.
What the tool does
The JSON Formatter and Validator makes JSON easier to read and check. It can format compact JSON with indentation, minify formatted JSON into a single line, and show syntax errors when the input is invalid.
JSON is used in APIs, configuration files, analytics events, no-code exports, app settings, and documentation. A small syntax mistake can break a request or configuration, so quick validation is valuable.
How it works
Paste JSON into the input box and choose Format or Minify. The tool parses the input with the browser's JSON parser. If the JSON is valid, it returns either a readable indented version or a compact minified version. If the JSON is invalid, it shows the parsing error.
Formatting adds whitespace for humans. Minifying removes whitespace for compact storage or transfer. Neither action changes the underlying data when the JSON is valid.
When to use it
Use the formatter when debugging API responses, preparing examples for documentation, reviewing exported data, cleaning configuration snippets, or checking JSON before pasting it into another system.
If you work with YAML too, use the YAML to JSON converter. For a practical introduction, read the JSON formatting guide.
Benefits
Formatted JSON is easier to scan. You can see nested objects, arrays, keys, and values without getting lost in a long line. Validation catches missing quotes, trailing commas, extra brackets, and other common mistakes.
Minified JSON is useful when space matters or when a system expects compact input. Having both actions in one tool keeps the workflow quick.
Examples
A compact string such as {"name":"TryFreeTool","active":true} becomes a readable object with each key on its own line. A formatted API example can be minified before pasting into an environment variable or test payload.
If you are debugging an error, format the JSON first and reduce the problem to the smallest useful snippet. Remove unrelated fields until the issue remains or disappears. This habit helps you identify whether the problem is syntax, a wrong data type, a missing key, or a value that the receiving system does not accept.
When sharing JSON with another person, include both the formatted snippet and a short note about what you expect each important field to do. The explanation often reveals mistakes that pure validation cannot catch, such as a valid field with the wrong business meaning.
If the JSON came from an API, save the endpoint name and date beside the snippet. Data contracts change, and that context helps future readers understand whether an example is current or only a historical debugging note.
Frequently Asked Questions
What makes JSON invalid? Common issues include single quotes, trailing commas, missing commas, unquoted keys, and unmatched braces or brackets.
Does formatting change values? No. It changes whitespace only.
When should I minify JSON? Use minification when a compact version is easier to store or paste.
Can I format very large JSON? Browser performance depends on your device. Very large files may be better handled in a developer environment.
Should I paste secrets? No. Avoid pasting API keys, tokens, passwords, or private customer data into public tools.