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JSON Compare
Compare two JSON documents online, validate their syntax, normalize formatting, and highlight added, removed, changed, and unchanged lines.
Validate both JSON documents before comparison Normalize formatting for a clearer diff Show side-by-side and unified comparison views Count added, removed, changed, and unchanged lines
Compare workspace
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Original JSON vs Modified JSON
Paste or upload two JSON documents to validate, normalize, and compare their structure.
Modified JSON
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Drop a text file here
About the tool
What JSON Compare does
JSON Compare is a free online JSON comparison tool for developers, QA engineers, analysts, and technical teams who need to identify differences between two structured data documents. It validates each document, normalizes valid JSON into a consistent readable format, and then highlights additions, removals, changed lines, and unchanged content.
Unlike a basic text comparison, this workflow first parses both JSON inputs. That means formatting differences such as indentation or compact versus pretty-printed JSON do not hide the actual structural changes. Invalid JSON is reported before the comparison begins, helping you locate syntax errors instead of reviewing an unreliable diff.
Use JSON Compare for API responses, configuration files, test fixtures, deployment settings, webhook payloads, exported records, and version-to-version data checks. The original and modified documents remain visible throughout the process so you can verify the complete result before downloading or sharing it.
How to use
- Add the original JSON. Paste the first document into the Original JSON panel or upload a compatible JSON or text file.
- Add the modified JSON. Paste or upload the second version into the Modified JSON panel.
- Run the comparison. Select Compare JSON, use the Run JSON Compare button in the process controls, or press Ctrl / ⌘ + Enter.
- Check validation messages. If either document contains invalid JSON, correct the reported syntax problem before continuing.
- Review every view. Use the side-by-side view for visual inspection, the unified view for a compact diff, and the raw-input view to confirm the submitted source.
- Verify and export. Review the added, removed, changed, and unchanged totals before downloading the diff.
Built for the task
Why use JSON Compare?
Focused controls, predictable output, and a workflow designed around this exact transformation.
01
JSON validation before comparison
Both documents must parse successfully, preventing misleading results caused by malformed JSON.
02
Clear change statistics
Separate totals show how many lines were added, removed, changed, or left unchanged.
03
Multiple diff views
Switch between side-by-side, unified, and raw-input views depending on the review task.
04
Source remains visible
The original and modified JSON stay available so the full comparison can be checked before export.
Useful answers
Questions about JSON Compare
Practical details about input, output, privacy, limits, and the best way to use this tool.
Answer 01
What is JSON Compare?
JSON Compare is an online JSON diff tool that validates, normalizes, and compares two JSON documents. It highlights additions, removals, changed lines, and unchanged content.
Answer 02
Does JSON Compare ignore indentation differences?
Yes. Valid inputs are parsed and formatted consistently before comparison, so compact and pretty-printed versions of the same JSON do not appear different only because of whitespace.
Answer 03
Can I compare JSON files instead of pasting text?
Yes. You can upload compatible JSON or text files into either comparison panel. Files larger than the supported workspace limit are rejected.
Answer 04
What happens when one JSON document is invalid?
The comparison stops and displays an error identifying whether the original or modified JSON contains invalid syntax. Correct that document and run the comparison again.
Answer 05
Can JSON Compare detect changed values?
Yes. Once both documents are normalized, changed lines are displayed separately from added and removed lines. Review surrounding structure to confirm the exact field affected.
Answer 06
Does property order affect the comparison?
Property order is retained during parsing and serialization. Two objects with identical values but different key order may therefore display ordering differences.
Answer 07
Can I download the JSON diff?
Yes. After a successful comparison, use Download diff to save a text representation of the additions, removals, and changes.
Answer 08
Is JSON Compare suitable for confidential data?
Avoid submitting passwords, private keys, access tokens, personal records, or sensitive production payloads to any environment you do not fully trust.
What is JSON Compare?
JSON Compare is an online JSON diff tool that validates, normalizes, and compares two JSON documents. It highlights additions, removals, changed lines, and unchanged content.
Does JSON Compare ignore indentation differences?
Yes. Valid inputs are parsed and formatted consistently before comparison, so compact and pretty-printed versions of the same JSON do not appear different only because of whitespace.
Can I compare JSON files instead of pasting text?
Yes. You can upload compatible JSON or text files into either comparison panel. Files larger than the supported workspace limit are rejected.
What happens when one JSON document is invalid?
The comparison stops and displays an error identifying whether the original or modified JSON contains invalid syntax. Correct that document and run the comparison again.
Can JSON Compare detect changed values?
Yes. Once both documents are normalized, changed lines are displayed separately from added and removed lines. Review surrounding structure to confirm the exact field affected.
Does property order affect the comparison?
Property order is retained during parsing and serialization. Two objects with identical values but different key order may therefore display ordering differences.
Can I download the JSON diff?
Yes. After a successful comparison, use Download diff to save a text representation of the additions, removals, and changes.
Is JSON Compare suitable for confidential data?
Avoid submitting passwords, private keys, access tokens, personal records, or sensitive production payloads to any environment you do not fully trust.
How JSON Compare works
The tool reads the original and modified inputs independently. Each document must contain one complete valid JSON value, such as an object, array, string, number, Boolean, or null. The most common use case is comparing two objects or arrays.
After validation, both documents are serialized with consistent indentation. This normalization removes irrelevant presentation differences and makes nested objects and arrays easier to compare line by line. The comparison engine then classifies rows as added, removed, changed, or unchanged.
Side-by-side JSON diff
The side-by-side view places the original JSON next to the modified JSON. It is useful when reviewing configuration changes, API payload updates, or nested values that need surrounding context.
Unified JSON diff
The unified view combines both versions into one sequence. Added lines use a plus-style change, removed lines use a minus-style change, and unchanged content provides context around the edit.
Common JSON Compare use cases
Compare API responses
Capture a response before and after a release, then compare status values, field names, nested records, and optional properties. This can reveal contract changes that may affect client applications.
Review configuration changes
Compare development, staging, and production configuration files before deployment. Look for missing keys, changed feature flags, updated endpoints, and environment-specific values.
Check test fixtures and exported data
Use the tool to verify whether a fixture, snapshot, webhook payload, or exported record changed as expected. Keep representative identifiers and edge cases in the sample.
Audit versioned JSON documents
Compare saved versions of package metadata, translation files, application settings, or generated manifests. The statistics provide a quick overview before detailed inspection.
JSON comparison best practices
Always compare complete documents rather than isolated fragments when context matters. Keep an untouched backup, confirm the first and last characters were copied, and remove comments because standard JSON does not support them.
Use realistic data, but replace secrets and personal information with safe placeholders. For large files, begin with a smaller representative sample, then inspect the beginning, middle, and end of the final comparison.
Remember that JSON object key order is generally not semantically significant to consumers, but this line-based visual comparison retains serialized property order. If order differs while values remain identical, review whether that distinction matters to your destination system.
Common JSON comparison errors
Trailing commas
A comma after the final object property or array item is invalid in standard JSON. Remove it before running the comparison.
Single quotation marks
JSON property names and string values require double quotation marks. Replace JavaScript-style single-quoted strings with valid JSON strings.
Unescaped characters
Quotation marks, backslashes, and control characters inside strings must be escaped correctly. A parser error often points near the first invalid character.
Partial documents
Missing opening or closing braces and brackets cause validation failure. Confirm the entire payload was copied from the source.
Comparing JSON with JavaScript objects
JavaScript object literals may include comments, functions, undefined values, unquoted keys, or trailing commas. Convert them to valid JSON before comparison.
How to review a JSON diff safely
Start with the summary counts, but do not rely on totals alone. Inspect each changed section and check the surrounding parent object or array. A single inserted array item can shift multiple lines and make a small logical change appear larger.
Confirm data types as well as visible values. The number 1, the string "1", the Boolean true, and the string "true" are different JSON values even when they look similar in a quick review.
Before using the modified document, validate it in the receiving application, test one safe record or environment, and keep the original version available for rollback.
Related Trexmi tools
Use JSON Formatter to make one document easier to read, JSON Validator to diagnose syntax problems, JSON Minifier to create compact JSON, or Text Diff when the inputs are not valid JSON.
JSON standard reference
For the formal data format and grammar, consult the JSON specification in RFC 8259.