Online JSON tools

Format / minify Escape / unescape JSON comparison JSON to CSV

Collapsible formatted results will appear on the right

Escape / unescape

Escape a JSON string with backslashes or unescape it. Useful for embedding text containing quotes, newlines or special characters in JSON.

Input text

Output

JSON comparison

Enter the old JSON on the left and the new JSON on the right to compare them line by line.

Left JSON

Right JSON

JSON to CSV

Convert a nonempty array of JSON objects to CSV. Nested objects and arrays remain JSON text; null and missing fields become empty cells.

JSON array

Online JSON formatting, validation and conversion

JSON copied from an API is often minified and hard to read. Paste it here to format it, check syntax and repair supported issues such as trailing commas or single-quoted strings. Review repaired output before using it.

Processing uses browser JSON parsing and serialization. Numbers outside the safe integer range may be rounded; represent identifiers as strings. Integer-like keys may be reordered, so output does not guarantee the original key order.

Paste your input, choose an operation and copy the result back to your editor. Arrays of objects can also be exported as CSV for further work in a spreadsheet.

Automatic formattingDetect and indent pasted data so nested structures are easier to read.

Error repairCan repair trailing commas, single-quoted strings, unquoted keys and comments outside strings. Ambiguous input remains an error.

Syntax validationLocate parsing errors with readable messages for manual correction.

CSV exportConvert object arrays to tables while preserving field names, including non-Latin headers.

Collapsible resultsExplore nested data in a collapsible read-only result view.

How to use it

Paste JSON from an API or file into the input field.
Format or validate it to see the processed result.
If an error appears, correct it and retry. Copy valid results or export object arrays as CSV.
Use comparison mode or the text diff tool to inspect differences line by line.

Frequently asked questions

What if validation fails?

Validation failure means the input still contains an error that could not be repaired. Check the indicated location for mismatched brackets, extra commas or missing quotes, then retry.

Can CSV headers contain non-Latin text?

Yes. For arrays of objects, field names are preserved as CSV headers, including non-Latin characters.

How does comparison work?

Comparison uses the line-based longest common subsequence (LCS) algorithm to identify added and deleted lines instead of simply aligning by line number.

How is my data handled?

Processing happens in your browser, and tool inputs are not uploaded to the server. Manage copied content and browser-restored inputs yourself.

Privacy: JSON processing happens locally in your browser. Tool inputs are not sent to the server. Browser state, extensions, clipboard content and downloaded files remain subject to your device and browser settings.