Calculator
What the JSON Diff Checker does
JSON Diff Checker: checks Status from JSON A (original) and JSON B (changed). Example: the sample loaded on the page gives status Compared.
From JSON A (original) and JSON B (changed), this tool derives Status. Enter what you need and trigger it when you are ready.
Most of these tasks are one-liners in a terminal, but not when you are away from one. The JSON Diff Checker exists to take that particular chore off your hands.
There is no back end here. The calculation runs where you are sitting, not on a server somewhere.
The method, a field-by-field reference and a worked example built from the defaults are all on this page.
What do the JSON Diff Checker fields mean?
The JSON Diff Checker uses 2 inputs. Starting values are already in place, which saves the usual blank-form hesitation about what a field wants.
| Field | What to enter | Default |
|---|---|---|
| JSON A (original) | paste or type any amount of text | { "name": "YoursTools", "version": 1, "active": true } |
| JSON B (changed) | paste or type any amount of text | { "name": "YoursTools", "version": 2, "active": true, "beta": false } |
How does the JSON Diff Checker work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same check.
The guard clauses run before the formula does, which is why mistakes surface next to the field.
Worked example
These are the values the JSON Diff Checker loads by default, and the result it produces from them. The figures are the tool’s live defaults and its live output, so you can reproduce them exactly.
| JSON A (original) | { "name": "YoursTools", "version": 1, "active": true } |
|---|---|
| JSON B (changed) | { "name": "YoursTools", "version": 2, "active": tru… |
| Status | Compared |
|---|
Read next: JSON Formatting: The Rules People Get Wrong
How to use it
- Paste your content into JSON A (original).
- Paste your content into JSON B (changed).
- Press Compare!.
- The panel reports Status.
- The link encodes your inputs, so saving it is enough to reproduce the result later.
What this tool does not do
- Output follows the common convention for this format; a specific toolchain may have its own house style.
- Processing happens in your browser, so extremely large inputs are bounded by available memory.
- It cannot detect a typo that happens to fall inside the valid range.
Frequently asked questions
JSON A (original) and JSON B (changed). That is the whole form. Defaults are loaded for all of them, which means a single edit is enough to get a meaningful answer.
With the values loaded when the page opens, status comes out as Compared. That number tracks the inputs, so a small edit shows its sensitivity immediately.
No. The parsing happens in your browser, so sensitive payloads never leave your machine.
Free, and there is no upsell. The whole tool is the free version.
Reliable for the case described. Where more than one convention exists, the method section says which one is used.