Merge of two files no longer works

[sinewave440hz]

Doing this, as in the docs:
cat test.json test2.json | json --merge gives the error:
json: error: input is not JSON: Syntax error at line 24, column 1: {
Previously it didn't, of course.

[trentm]

Repro:

$ cat b.json a.json b.json
{"foo":2}{
    "foo": 1
}
{"foo":2}$
$ cat b.json a.json b.json | ./lib/json.js --merge
json: error: input is not JSON: Syntax error at line 1, column 10:
        {"foo":2}{
        .........^
{"foo":2}{
    "foo": 1
}
{"foo":2}

$ ./lib/json.js --version
json 9.0.6

@sinewave440hz However, I see this all the way back to json v4 when --merge was introduced:

$ json4 --version
(node) util.puts is deprecated. Use console.log instead.
json 4.0.1
[21:24:21 trentm@danger0:~/tm/json (master)]
$ cat b.json a.json b.json | json4 --merge
json: error: input is not JSON: Syntax error at line 1, column 10:
        {"foo":2}{
        .........^
{"foo":2}{
    "foo": 1
}
{"foo":2}

Can you show me a case (showing the specific test.json and test2.json content) where that works in an earlier version of json and fails on newer versions? Thanks.

[sinewave440hz]

Apparently not, I tried on earlier versions last night and got the same result. I haven't dug much further into it, but I had a script working earlier that combined two package.jsons successfully. This was on a much older node.js though - 4.4.7. I will try and put aside some time to take a look at this, but in the meantime, how can we do the equivalent of the merge example in your docs, but with files? Any suggestions?

[trentm]

My bet is that the difference is that your files don't end with a newline. I think jsons current attempts to handle adjacent JS objects with --merge and -g have limitations when there are two incomplete objects on a given line.

[eddyparkinson]

Merge error work around

• Fails:

$ json -f dump.json -f dump_new.json --merge >dump_merge.json
json: error: input is not JSON: Syntax error at line 20427, column 2:
        }{
        .^

• works:

$ json -f dump.json  >dump_1.json
$ json  -f dump_new.json >dump_2.json
$ json --merge -f dump_1.json -f dump_2.json  >dump_merge.json

[kondaurovDev]

@eddyparkinson , didn't understand your example

@trentm has said right thing, your files with json must have empty line in the end

[eddyparkinson]

json is not good with newlines. It is very picky when merging. But if you first do

json -f filename.json >tmpfile.json

then it fixes the newlines. tmpfile.json will have the needed newlines and can be used with json --merge