JSON Filter Tool
Filter JSON data by keys and values
About the JSON Filter Tool
When a JSON array holds hundreds of records but you only care about some of them, scrolling to find the matches is tedious. JSON Filter narrows an array down to the items you want by a key — optionally matching a specific value — and returns the filtered result, neatly formatted.
Developers use it to pull just the active users, the orders over a threshold, or the records that have a particular field set, straight out of an API response. It is a quick, no-code way to slice a dataset: give it a key to filter on and, if you like, a value to match, and it hands back only the items that qualify.
How to Use the JSON Filter Tool
- Paste your JSON array (or a single object) into the input.
- Enter the key to filter on.
- Optionally enter a value to match against that key.
- Apply the filter and read the matching items, formatted and ready to copy.
Why Use ToolForge’s JSON Filter Tool
- It filters by a key and an optional value with a simple, no-syntax interface — no query language to learn.
- Value matching is a case-insensitive substring search, so partial matches are caught without exact casing.
- It accepts either an array or a single object and always returns cleanly formatted JSON.
- Filtering runs in your browser, so API data you paste is never uploaded.
Frequently Asked Questions
How does the filtering work?
It keeps every item in the array that has the key you specify. If you also give a value, it keeps only items whose value for that key contains your text, matched case-insensitively. The rest are dropped from the output.
Can I filter on nested fields?
The filter matches on a top-level key of each item. For deeply nested data, extract the relevant level first with a JSON path tool, then filter the result here.
What if no items match?
You get an empty result, which simply means no item had that key or matched your value. Check the key spelling and that your value text appears in the data — remember the value match is a partial, case-insensitive one.
Can I filter on a numeric range, like price over 100?
The filter does substring matching on the value rather than numeric comparison, so it cannot express "greater than". To keep items with a field present, filter by the key alone; for range conditions, post-process the filtered output in a spreadsheet or script.
