JSON Formatter & Validator
Paste JSON to validate it, indent it for reading, or minify it for shipping.
Deze inhoud is in het Engels.
Uitgewerkte voorbeelden
Formatting a minified API response
{"user":{"id":42,"name":"Asha","roles":["admin","editor"]}}
{ "user": { "id": 42, "name": "Asha", "roles": [ "admin", "editor" ] } }
The default indent is two spaces, and the message above the output confirms the JSON is valid.
Finding a trailing comma error
{"name":"Ben","age":34,}
Expected double-quoted property name in JSON at position 23 (line 1 column 24)
A comma after the last property is not allowed; the exact wording of the message depends on the browser, but the position points at the closing brace.
Over JSON Formatter & Validator
JSON is the format most APIs, config files and data exports use, but raw output is often a single dense line that is hard to read. A JSON formatter adds indentation so nested objects and arrays become easy to scan. It also checks syntax, so a missing comma or stray quotation mark is flagged before it breaks your application.
The tool also minifies JSON, removing whitespace to reduce payload size for requests, logs and configuration embedded in code. Validation errors are reported with descriptive messages, which helps you locate the exact line causing a parse failure. Use it while debugging, reviewing fixtures, or preparing test data before committing changes to a repository.
Zo gebruikt u JSON Formatter & Validator
- Paste your JSON into the input area.
- Select the pretty-print option to indent the structure, or choose minify to remove whitespace.
- Check the validation message for any error and note the line it points to.
- Fix the flagged line, then run the check again.
- Copy the result into your code, config file or API client.
Veelvoorkomend gebruik
- Reading a verbose API response during integration work.
- Tidying a configuration file before a code review.
- Finding a missing bracket in a large payload.
- Minifying JSON to reduce the size of a request body.
Veelgestelde vragen
What is the difference between formatting and validating JSON?
Formatting rewrites JSON with consistent indentation and line breaks so people can read it, without changing the data. Validating checks that the text follows the JSON syntax rules, such as quoted keys, correct commas and matching brackets. A formatter needs valid structure before it can indent text. Use both together for quicker debugging.
Why is my JSON invalid even though it looks correct?
Common causes include trailing commas after the last item, single quotation marks instead of double quotation marks, unquoted property names, and comments, which JSON does not allow. Hidden characters, such as a byte order mark copied from another program, can also cause a parse failure. Paste the text into a validator to see the exact position of the first error.
Does minifying JSON change its meaning?
No. Minifying removes spaces, line breaks and indentation between tokens, but keys, values, array order and data types stay the same. Parsers read both forms identically, so the minified version works wherever the original did. Keep a formatted copy if humans need to review the data, because a single long line is harder to edit.
Can a JSON formatter handle very large files?
Formatting handles large documents, but practical limits depend on file size and available capacity. Very large payloads take longer to validate and display. If a file is too big to paste comfortably, extract the relevant section, such as one array or object, and format that part. This keeps the output readable and easier to check.
Does the formatter support JSON with comments or JSON5?
Standard JSON does not allow comments, trailing commas or single-quoted strings, so those count as errors. JSON5 and JSONC add some of these features, but strict parsers reject them. Remove comments and trailing commas before using the output in an API request or a standard configuration file.