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Free online JSON syntax highlighter. Colorize and format JSON strings to easily visualize data hierarchy, structure, and nested elements.
Disable for minified, single-line JSON output
Enter JSON to see a colored preview
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Paste strict JSON to see its structure with separate colors for object keys, string values, numbers, booleans, null, and punctuation. Choose among five color themes. When beautification is enabled, select two spaces, four spaces, or tabs for indentation; turn it off to compact the parsed value onto one line. A valid JSON document can be an object, array, string, number, boolean, or null, as defined by RFC 8259.
This is a syntax display and formatter. It parses JSON text, then serializes it again for the preview; it does not check whether keys or values meet an API contract, validate a JSON Schema, compare against a database, or explain what fields mean.
JSON is not the same as a JavaScript object literal or a relaxed configuration format. Standard JSON requires quoted string keys, double-quoted strings, commas between members, and lowercase true, false, and null values. Comments, single-quoted strings, and trailing commas are not part of strict JSON syntax, so text containing them will produce a parse error until corrected. RFC 8259 defines the grammar used for this distinction.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Paste or type one JSON text in the input area. Start with the complete value, including its opening and closing braces or brackets when applicable.
Choose a theme and select two spaces, four spaces, or tabs. Leave beautification on for indented output or turn it off for compact output.
Review the colored preview. If parsing fails, correct the reported syntax issue in the input and try again.
Copy either the preview text or the generated HTML snippet, depending on where you intend to use it.
Example input {"active":true,"count":3} becomes a multi-line object when beautification is enabled. Compact mode removes the formatting whitespace while preserving the parsed JSON value.
Use cases
See how the tool fits into real work and everyday tasks.
After obtaining a JSON response, paste a small sample to distinguish keys from strings, numbers, and Boolean values. Then validate required fields with the API's own documentation or schema.
Format a valid sample for a report, ticket, or lesson. Select an indentation style that fits the surrounding document and check the copied result after pasting.
Q&A
Find concise answers to common questions and confusing cases.
Comments are not part of strict JSON grammar. Remove the comment or convert the content to valid JSON before using this highlighter.
No. It parses and reformats JSON syntax but does not compare fields, types, or required values with a schema.
It serializes the parsed JSON without indentation whitespace. Because it parses and serializes the value, it may normalize the text representation; compare the result if exact original text matters.
No. Use double-quoted JSON strings and remove trailing commas to satisfy strict JSON syntax.
Notes
Review scope, result limitations, and important precautions before use.
A successful preview only means the text could be parsed as JSON and rendered. It does not establish that values are correct, safe, complete, or accepted by a particular service. Formatting can normalize whitespace and number or escape representation, so retain the original when byte-for-byte preservation matters. Do not paste credentials, tokens, personal records, or confidential payloads unless you are authorized and comfortable processing them with this online service.
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