JSON Formatter & Validator
Paste JSON, then format it, minify it, or check whether it's valid. Errors point to the exact problem.
What "pretty-print" does
Pretty-printing adds line breaks and 2-space indentation so nested objects and arrays are easy to scan. Minifying strips all unnecessary whitespace, which is useful when you want the smallest possible payload to send over a network.
Reading the error message
When JSON is invalid, this tool shows the character position where parsing failed. The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys.
About the JSON Formatter & Validator
The JSON Formatter pretty-prints, minifies and validates JSON. Paste a compact or messy JSON string and get a readable, indented version, or compress it to save space, or just check that it is valid and see exactly where an error is.
JSON is a text format for structured data, with strict rules: keys and strings use double quotes, there are no trailing commas, no comments and no single quotes. The validator reports the position of the first problem, and common mistakes include a missing comma, an extra comma at the end of a list or unquoted keys. Formatting does not change data; it only changes whitespace.
How to use it
- Paste your JSON into the input.
- Press Format, Minify or Validate only.
- Read the output or the error message.
- Use Copy output.
Tips and good to know
- When an error points to a position, look just before it, since the real mistake is often a missing comma on the previous line.
- JavaScript objects with single quotes are not valid JSON.
- Large files may be slow in the browser.
Frequently asked questions
Can it fix invalid JSON?
No, but it points to the error.
Does formatting change the order of keys?
No.
Is my data uploaded?
No.