JSON Bad String Error

Question

I am creating an JSON file which stores some Physics equation, which will be rendered using MathJax.

"equations": [
    "$w = F.s\cos\theta$"
 ]

I am getting a bad string error. I have tried adding another backslash before the slashes but that changes the equations drastically. Is there any way to fix this issue without changing the equation

Adrian Wragg · Accepted Answer · 2017-01-26 15:25:30Z

4

There were two issues you were falling over.

Firstly, a valid JSON file will have { and } around it (as David Gatti mentions in his answer, it is an object after all). Secondly, certain characters - including backslashes - will need to be escaped. When you parse it back into an object, the additional backslashes will be removed.

Your corrected JSON should read:

{
    "equations": [
        "$w = F.s\\cos\\theta$ "
    ]
}

answered Jan 26, 2017 at 15:25

Adrian Wragg

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Comments

Markus Jarderot · Accepted Answer · 2017-01-26 15:29:34Z

1

JSON is an encoding of structured data. You write

{
  "equations": [
    "$w = F.s\\cos\\theta$"
  ]
}

to mean an object with a property named equations with an array with a single string:

$w = F.s\cos\theta$

The escaped backslashes (\) does not change the underlying data. They get removed by the receiver when the JSON gets decoded into the object graph.

answered Jan 26, 2017 at 15:29

Markus Jarderot

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