JSON tools
Run real jq on JSON or text. Choose an input mode, inspect stdout and keep the exact program for your shell.
Preview is displayed in 5,000-character blocks. Copy and download include the complete result.
Input and programs stay in browser memory; no history is saved.
Allowed: -c -r -j -S -a -e (combined short flags and long aliases). Select -s/-R/-n using the mode control.
jq 1.8.2 · local WebAssembly · manual execution
Result is out of date; copy and download are disabled.
POSIX shell only. Save the input as input.json first; copied commands contain no input data.
The jq playground helps when an API response needs a smaller shape before it reaches a script. Test select conditions, map fields or build a new object while keeping the original input available.
A jq online session can produce several values, one array or no output at all. This jq filter tester keeps that distinction visible; a jq query tester should not silently wrap every result in an array.
A filter such as .people[] | select(.age >= 18) | .name emits a separate string for each adult. The preview retains each output and its newline so you can see what the next process will actually receive.
The jq playground applies -s before evaluating your program, collecting all JSON inputs into one array. This differs from wrapping a filter in brackets, which collects that filter’s outputs for each current input.
JSON mode accepts consecutive JSON values. Slurp collects those values; raw mode reads text by line, while raw plus slurp reads one entire string. Null mode starts with null, but input and inputs can still read the supplied data.
A file, sample or clear action first shows a preview. Apply replaces input, program and settings as shown; one undo restores the previous result as well. Run with the button or Ctrl/Cmd+Enter. Any edit makes export unavailable until another run.
All engine exit codes are displayed. Nonzero codes disable export, even when -e merely reports false, null or no result. Remove -e and rerun when suitable. The POSIX command expects the same data saved in input.json.
Use select to retain records and map to produce an array of transformed items. The sample compares numeric ages and builds objects with an adult boolean; strings containing digits remain a different JSON type.
The jq 1.8.2 WASM engine handles pipes, reduce, def, recursion, try/catch and regular expressions. It is not a JavaScript imitation of common filters. File modules and extra CLI file arguments are not exposed.
Use -r for raw strings, -j to omit separators, -c for compact JSON, -S for sorted keys and -a for ASCII escapes. Short combinations and the corresponding long aliases are accepted; other flags are rejected.
Whitespace, a leading BOM and NUL characters remain in the exported text. debug and stderr output appear separately. The preview expands in 5,000-character blocks; an accepted export contains the complete result.
For the sample use .people[] | select(.age >= 18) | .name. The [] iterator emits each record, select keeps matches and .name extracts one field. Wrap the full expression in brackets only if the next step needs one array.
Add -r in Output options. It removes JSON quotes from string results but does not strip spaces inside the string. Objects and arrays are still serialized as JSON. Use -j only when you also want to remove output separators.
Write [.people[] | select(.age >= 18)]. The brackets collect all values emitted by the enclosed filter. An unmatched selection then becomes [] rather than an empty stream, which can matter to the next command.
Choose Collect JSON (-s), then run . to inspect the array. For input arrays that need concatenating, -s with add combines the arrays. This is different from merging objects, where duplicate keys need a deliberate policy.
Choose Text lines (-R) and start with split("=") | {(.[0]): .[1]} for simple lines. Trim key and value spaces as required. A value containing another equals sign needs different splitting logic; do not assume every configuration format has the same escaping rules.
Found a query this tool handles incorrectly?
Use the jq playground to compare the multi-result example with map, then move a checked program into your own script.